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2. Cytotoxic effects of ZnO nanoparticles on mouse testicular cells

Author

Han Z, Yan Q, Ge W, Liu ZG, Gurunathan S, De Felici M, Shen W, and Zhang XF

Subjects
ZnO nanoparticle, Sertoli cells, Leydig cells, mice, Medicine (General), R5-920
Abstract

Zhe Han,1,* Qi Yan,1,* Wei Ge,2 Zhi-Guo Liu,1 Sangiliyandi Gurunathan,3 Massimo De Felici,4 Wei Shen,2 Xi-Feng Zhang1 1College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, People’s Republic of China; 2Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology, Qingdao Agricultural University, Qingdao, People’s Republic of China; 3Department of Stem Cell and Regenerative Biology, Konkuk University, Seoul, Republic of Korea; 4Department of Biomedicine and Prevention, University of Rome “Tor Vergata”, Rome, Italy *These authors contributed equally to this work Background: Nanoscience and nanotechnology are developing rapidly, and the applications of nanoparticles (NPs) have been found in several fields. At present, NPs are widely used in traditional consumer and industrial products, however, the properties and safety of NPs are still unclear and there are concerns about their potential environmental and health effects. The aim of the present study was to investigate the potential toxicity of ZnO NPs on testicular cells using both in vitro and in vivo systems in a mouse experimental model. Methods: ZnO NPs with a crystalline size of 70 nm were characterized with various analytical techniques, including ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and atomic force microscopy. The cytotoxicity of the ZnO NPs was examined in vitro on Leydig cell and Sertoli cell lines, and in vivo on the testes of CD1 mice injected with single doses of ZnO NPs.Results: ZnO NPs were internalized by Leydig cells and Sertoli cells, and this resulted in cytotoxicity in a time- and dose-dependent manner through the induction of apoptosis. Apoptosis likely occurred as a consequence of DNA damage (detected as γ-H2AX and RAD51 foci) caused by increase in reactive oxygen species associated with loss of mitochondrial membrane potential. In addition, injection of ZnO NPs in male mice caused structural alterations in the seminiferous epithelium and sperm abnormalities.Conclusion: These results demonstrate that ZnO NPs have the potential to induce apoptosis in testicular cells likely through DNA damage caused by reactive oxygen species, with possible adverse consequences for spermatogenesis and therefore, male fertility. This suggests that evaluating the potential impacts of engineered NPs is essential prior to their mass production, to address both the environmental and human health concerns and also to develop sustainable and safer nanomaterials. Keywords: ZnO nanoparticle, Sertoli cells, Leydig cells, mice

Published
2016

4. Analysis of Secreted Proteins from Prepubertal Ovarian Tissues Exposed In Vitro to Cisplatin and LH

Author

Marcozzi, S., Ciccosanti, F., Fimia, G. M., Piacentini, M., Caggiano, C., Sette, C., De Felici, M., Klinger, F. G., Caggiano C., Sette C. (ORCID:0000-0003-2864-8266), Marcozzi, S., Ciccosanti, F., Fimia, G. M., Piacentini, M., Caggiano, C., Sette, C., De Felici, M., Klinger, F. G., Caggiano C., and Sette C. (ORCID:0000-0003-2864-8266)

Abstract

It is well known that secreted and exosomal proteins are associated with a broad range of physiological processes involving tissue homeostasis and differentiation. In the present paper, our purpose was to characterize the proteome of the culture medium in which the oocytes within the primordial/primary follicles underwent apoptosis induced by cisplatin (CIS) or were, for the most part, protected by LH against the drug. To this aim, prepubertal ovarian tissues were cultured under control and in the presence of CIS, LH, and CIS + LH. The culture media were harvested after 2, 12, and 24 h from chemotherapeutic drug treatment and analyzed by liquid chromatography–mass spectrometry (LC-MS). We found that apoptotic conditions generated by CIS in the cultured ovarian tissues and/or oocytes are reflected in distinct changes in the extracellular microenvironment in which they were cultured. These changes became evident mainly from 12 h onwards and were characterized by the inhibition or decreased release of a variety of compounds, such as the proteases Htra1 and Prss23, the antioxidants Prdx2 and Hbat1, the metabolic regulators Ldha and Pkm, and regulators of apoptotic pathways such as Tmsb4x. Altogether, these results confirm the biological relevance of the LH action on prepuberal ovaries and provide novel information about the proteins released by the ovarian tissues exposed to CIS and LH in the surrounding microenvironment. These data might represent a valuable resource for future studies aimed to clarify the effects and identify biomarkers of these compounds’ action on the developing ovary.

Published
2022

9. Purification of mouse primordial germ cells by miniMACS magnetic separation system

Author

Pesce, M. and De Felici, M.

Subjects
Mice -- Anatomy, Embryology -- Research, Magnetic separators -- Usage, Germ cells -- Research, Cell separation -- Methods, Biological sciences
Abstract

The magnetic cell sorter miniMACS is used to isolate rare primordial germ cells (PGCs) from mouse embryos between 10.5 and 13.5 days post coitum. The labeled germ cells retained in the magnetic column are easily eluted and then can be used immediately for biochemical studies or cultured in appropriate in vitro systems for future germ cell experiments.

Published
1995

11. The cyto-protective effects of LH on ovarian reserve and female fertility during exposure to gonadotoxic alkylating agents in an adult mouse model.

Author

Castillo, L M Del, Buigues, A, Rossi, V, Soriano, M J, Martinez, J, Felici, M De, Lamsira, H K, Rella, F Di, Klinger, F G, Pellicer, A, Herraiz, S, Del Castillo, L M, De Felici, M, and Di Rella, F

Subjects
OVARIAN reserve, OVARIES, LABORATORY mice, ALKYLATING agents, INDUCED ovulation, FERTILITY preservation, ADULTS, WARNING labels, RESEARCH, ANIMAL experimentation, RESEARCH methodology, MEDICAL cooperation, EVALUATION research, COMPARATIVE studies, RESEARCH funding, MICE
Abstract

Study Question: Does LH protect mouse oocytes and female fertility from alkylating chemotherapy?Summary Answer: LH treatment before and during chemotherapy prevents detrimental effects on follicles and reproductive lifespan.What Is Known Already: Chemotherapies can damage the ovary, resulting in premature ovarian failure and reduced fertility in cancer survivors. LH was recently suggested to protect prepubertal mouse follicles from chemotoxic effects of cisplatin treatment.Study Design, Size, Duration: This experimental study investigated LH effects on primordial follicles exposed to chemotherapy. Seven-week-old CD-1 female mice were randomly allocated to four experimental groups: Control (n = 13), chemotherapy (ChT, n = 15), ChT+LH-1x (n = 15), and ChT+LH-5x (n = 8). To induce primary ovarian insufficiency (POI), animals in the ChT and ChT+LH groups were intraperitoneally injected with 120 mg/kg of cyclophosphamide and 12 mg/kg of busulfan, while control mice received vehicle. For LH treatment, the ChT+LH-1x and ChT+LH-5x animals received a 1 or 5 IU LH dose, respectively, before chemotherapy, then a second LH injection administered with chemotherapy 24 h later. Then, two animals/group were euthanized at 12 and 24 h to investigate the early ovarian response to LH, while remaining mice were housed for 30 days to evaluate short- and long-term reproductive outcomes. The effects of LH and chemotherapy on growing-stage follicles were analyzed in a parallel experiment. Seven-week-old NOD-SCID female mice were allocated to control (n = 5), ChT (n = 5), and ChT+LH-1x (n = 6) groups. Animals were treated as described above, but maintained for 7 days before reproductive assessment.Participants/materials, Setting, Methods: In the first experiment, follicular damage (phosphorylated H2AX histone (γH2AX) staining and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay), apoptotic biomarkers (western blot), and DNA repair pathways (western blot and RT-qPCR) were assessed in ovaries collected at 12 and 24 h to determine early ovarian responses to LH. Thirty days after treatments, remaining mice were stimulated (10 IU of pregnant mare serum gonadotropin (PMSG) and 10 IU of hCG) and mated to collect ovaries, oocytes, and embryos. Histological analysis was performed on ovarian samples to investigate follicular populations and stromal status, and meiotic spindle and chromosome alignment was measured in oocytes by confocal microscopy. Long-term effects were monitored by assessing pregnancy rate and litter size during six consecutive breeding attempts. In the second experiment, mice were stimulated and mated 7 days after treatments and ovaries, oocytes, and embryos were collected. Follicular numbers, follicular protection (DNA damage and apoptosis by H2AX staining and TUNEL assay, respectively), and ovarian stroma were assessed. Oocyte quality was determined by confocal analysis.Main Results and the Role Of Chance: LH treatment was sufficient to preserve ovarian reserve and follicular development, avoid atresia, and restore ovulation and meiotic spindle configuration in mature oocytes exposed at the primordial stage. LH improved the cumulative pregnancy rate and litter size in six consecutive breeding rounds, confirming the potential of LH treatment to preserve fertility. This protective effect appeared to be mediated by an enhanced early DNA repair response, via homologous recombination, and generation of anti-apoptotic signals in the ovary a few hours after injury with chemotherapy. This response ameliorated the chemotherapy-induced increase in DNA-damaged oocytes and apoptotic granulosa cells. LH treatment also protected growing follicles from chemotherapy. LH reversed the chemotherapy-induced depletion of primordial and primary follicular subpopulations, reduced oocyte DNA damage and granulosa cell apoptosis, restored mature oocyte cohort size, and improved meiotic spindle properties.Large Scale Data: N/A.Limitations, Reasons For Caution: This was a preliminary study performed with mouse ovarian samples. Therefore, preclinical research with human samples is required for validation.Wider Implications Of the Findings: The current study tested if LH could protect the adult mouse ovarian reserve and reproductive lifespan from alkylating chemotherapy. These findings highlight the therapeutic potential of LH as a complementary non-surgical strategy for preserving fertility in female cancer patients.Study Funding/competing Interest(s): This study was supported by grants from the Regional Valencian Ministry of Education (PROMETEO/2018/137), the Spanish Ministry of Science and Innovation (CP19/00141), and the Spanish Ministry of Education, Culture and Sports (FPU16/05264). The authors declare no conflict of interest. [ABSTRACT FROM AUTHOR]

Published
2021
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13. Melatonin protects prepuberal testis from deleterious effects of bisphenol A or diethylhexyl phthalate by preserving H3K9 methylation

Author

Zhang, T., Zhou, Y., Li, L., Zhao, Y., De Felici, M., Reiter, R.J., Shen, W., Zhang, T., Zhou, Y., Li, L., Zhao, Y., De Felici, M., Reiter, R.J., and Shen, W.

Abstract

A growing number of couples experience fertility issues with almost half being due to malefactors. The exposure to toxic environmental contaminants, such as endocrine disruptors (EDs), has been shown to negatively affect male fertility. EDs are present in the environment, and exposure to these toxins results in the failure of spermatogenesis. The deleterious effects of EDs on spermatogenesis have been well documented, whereas improvement of infertility associated with spermatogenesis defects remains a great challenge. Herein, we report that in vitro exposure of prepuberal mouse testes to two well-known endocrine disruptors (EDs), bisphenol A (BPA) or diethylhexyl phthalate (DEHP), impairs spermatogenesis with perturbing self-renewal, spermatogonia activity, and meiosis. Evidence indicates that such effects are likely due, at least in part, to decreased G9a-dependent H3K9 di-methylation. Of note, we found that melatonin (MLT) protected the testis from the negative ED impacts with preserving spermatogonia stem and meiotic cells, along with maintaining normal H3K9 di-methylation in these cells. Taken together, this work documents that BPA and EDHP adversely affect prepuberal spermatogenesis and perturb crucial epigenetic activities in male germ cells and highlight the protective ability of MLT.

Published
2018

14. Monte Carlo code comparison of dose delivery prediction for Microbeam Radiation Therapy.

Author

de Felici, M, Siegbahn, E, Spiga, J, Hanson, A, Felici, R, Ferrero, C, Tartari, A, Gambaccini, M, Keyrilaeinen, J, Braeuer-Krisch, E, Randaccio, P, Bravin, A, BA Verhaegen, F, Seuntjens, J, de Felici M., Siegbahn E. A., Spiga J., Hanson A. L., Felici R., Ferrero C., Tartari A., Gambaccini M., Keyrilaeinen J., Braeuer-Krisch E., Randaccio P., Bravin A, BA Verhaegen F, Seuntjens J, de Felici, M, Siegbahn, E, Spiga, J, Hanson, A, Felici, R, Ferrero, C, Tartari, A, Gambaccini, M, Keyrilaeinen, J, Braeuer-Krisch, E, Randaccio, P, Bravin, A, BA Verhaegen, F, Seuntjens, J, de Felici M., Siegbahn E. A., Spiga J., Hanson A. L., Felici R., Ferrero C., Tartari A., Gambaccini M., Keyrilaeinen J., Braeuer-Krisch E., Randaccio P., Bravin A, BA Verhaegen F, and Seuntjens J

Abstract

Preclinical Microbeam Radiation Therapy (MRT) research programs are carried out at the European Synchrotron Radiation Facility (ESRF) and at a few other synchrotron facilities. MRT needs an accurate evaluation of the doses delivered to biological tissues for carrying out pre-clinical studies. This point is crucial for determining the effect induced by changing any of the physical irradiation parameters. The doses of interest in MRT are normally calculated using Monte Carlo (MC) methods. A few MC packages have been used in the last decade for MRT dose evaluations in independent studies. The aim of this investigation is to provide a preliminary basis to perform a systematic comparison of the dose results obtained, under identical irradiation conditions and for the same scoring geometries with the following five MC codes: EGS4, PENELOPE, GEANT4, EGSnrc, and MCNPX. Dose profiles have been calculated in an in-depth region of cylindrical phantoms made of water or PMMA. Beams in both cylindrical and planar geometry have been considered. This comparison shows an overall agreement among the different codes although minor differences occur, which need further investigations. © 2008 IOP Publishing Ltd.

Published
2008

15. Effects induced by the fine structure of biological tissues on microbeam dose deposition: A numerical study

Author

De Felici, M, Tartari, A, Taibi, A, Gambaccini, M, Felici, R, Bravin, A, Ferrero, C, Finet, S, De Felici M, Tartari A, Taibi A, Gambaccini M, Felici R, Bravin A, Ferrero C, Finet S, De Felici, M, Tartari, A, Taibi, A, Gambaccini, M, Felici, R, Bravin, A, Ferrero, C, Finet, S, De Felici M, Tartari A, Taibi A, Gambaccini M, Felici R, Bravin A, Ferrero C, and Finet S

Abstract

In this work small angle coherent scattering data are presented for some biological tissues. The effect of low angle diffusion on the micro-beams dose distributions are assessed by means of a dedicated version of the EGS4 code. The atomic form factor tabulations were upgraded in EGS4 to include experimental values of compounds instead of obtaining the linear differential scattering coefficient from a simple weighted sum of the elemental components. In this manner, one includes the effects induced by both the large-scale arrangement of the sample structure and the molecular interference. It is shown that the inclusion of the measured form factors and cross-sections in the photon transport calculations induce not negligible effects in the dose deposited around the microbeams. The fact of not taking into account small angle scattering cross-sections may lead to underestimating the number of scattered photons reaching zones not directly illuminated. At the center of a microbeam planar array the effect can be as much as 100% for X-ray photons of 50 keV.

Published
2005

16. Guidelines for the use and interpretation of assays for monitoring autophagy

Author

Klionsky, D.J. Abdalla, F.C. Abeliovich, H. Abraham, R.T. Acevedo-Arozena, A. Adeli, K. Agholme, L. Agnello, M. Agostinis, P. Aguirre-Ghiso, J.A. Ahn, H.J. Ait-Mohamed, O. Ait-Si-Ali, S. Akematsu, T. Akira, S. Al-Younes, H.M. Al-Zeer, M.A. Albert, M.L. Albin, R.L. Alegre-Abarrategui, J. Aleo, M.F. Alirezaei, M. Almasan, A. Almonte-Becerril, M. Amano, A. Amaravadi, R. Amarnath, S. Amer, A.O. Andrieu-Abadie, N. Anantharam, V. Ann, D.K. Anoopkumar-Dukie, S. Aoki, H. Apostolova, N. Arancia, G. Aris, J.P. Asanuma, K. Asare, N.Y.O. Ashida, H. Askanas, V. Askew, D.S. Auberger, P. Baba, M. Backues, S.K. Baehrecke, E.H. Bahr, B.A. Bai, X.-Y. Bailly, Y. Baiocchi, R. Baldini, G. Balduini, W. Ballabio, A. Bamber, B.A. Bampton, E.T.W. Bánhegyi, G. Bartholomew, C.R. Bassham, D.C. Bast Jr., R.C. Batoko, H. Bay, B.-H. Beau, I. Béchet, D.M. Begley, T.J. Behl, C. Behrends, C. Bekri, S. Bellaire, B. Bendall, L.J. Benetti, L. Berliocchi, L. Bernardi, H. Bernassola, F. Besteiro, S. Bhatia-Kissova, I. Bi, X. Biard-Piechaczyk, M. Blum, J.S. Boise, L.H. Bonaldo, P. Boone, D.L. Bornhauser, B.C. Bortoluci, K.R. Bossis, I. Bost, F. Bourquin, J.-P. Boya, P. Boyer-Guittaut, M. Bozhkov, P.V. Brady, N.R. Brancolini, C. Brech, A. Brenman, J.E. Brennand, A. Bresnick, E.H. Brest, P. Bridges, D. Bristol, M.L. Brookes, P.S. Brown, E.J. Brumell, J.H. Brunetti-Pierri, N. Brunk, U.T. Bulman, D.E. Bultman, S.J. Bultynck, G. Burbulla, L.F. Bursch, W. Butchar, J.P. Buzgariu, W. Bydlowski, S.P. Cadwell, K. Cahová, M. Cai, D. Cai, J. Cai, Q. Calabretta, B. Calvo-Garrido, J. Camougrand, N. Campanella, M. Campos-Salinas, J. Candi, E. Cao, L. Caplan, A.B. Carding, S.R. Cardoso, S.M. Carew, J.S. Carlin, C.R. Carmignac, V. Carneiro, L.A.M. Carra, S. Caruso, R.A. Casari, G. Casas, C. Castino, R. Cebollero, E. Cecconi, F. Celli, J. Chaachouay, H. Chae, H.-J. Chai, C.-Y. Chan, D.C. Chan, E.Y. Chang, R.C.-C. Che, C.-M. Chen, C.-C. Chen, G.-C. Chen, G.-Q. Chen, M. Chen, Q. Chen, S.S.-L. Chen, W. Chen, X. Chen, X. Chen, X. Chen, Y.-G. Chen, Y. Chen, Y. Chen, Y.-J. Chen, Z. Cheng, A. Cheng, C.H.K. Cheng, Y. Cheong, H. Cheong, J.-H. Cherry, S. Chess-Williams, R. Cheung, Z.H. Chevet, E. Chiang, H.-L. Chiarelli, R. Chiba, T. Chin, L.-S. Chiou, S.-H. Chisari, F.V. Cho, C.H. Cho, D.-H. Choi, A.M.K. Choi, D. Choi, K.S. Choi, M.E. Chouaib, S. Choubey, D. Choubey, V. Chu, C.T. Chuang, T.-H. Chueh, S.-H. Chun, T. Chwae, Y.-J. Chye, M.-L. Ciarcia, R. Ciriolo, M.R. Clague, M.J. Clark, R.S.B. Clarke, P.G.H. Clarke, R. Codogno, P. Coller, H.A. Colombo, M.I. Comincini, S. Condello, M. Condorelli, F. Cookson, M.R. Coombs, G.H. Coppens, I. Corbalan, R. Cossart, P. Costelli, P. Costes, S. Coto-Montes, A. Couve, E. Coxon, F.P. Cregg, J.M. Crespo, J.L. Cronjé, M.J. Cuervo, A.M. Cullen, J.J. Czaja, M.J. D'Amelio, M. Darfeuille-Michaud, A. Davids, L.M. Davies, F.E. De Felici, M. De Groot, J.F. De Haan, C.A.M. De Martino, L. De Milito, A. De Tata, V. Debnath, J. Degterev, A. Dehay, B. Delbridge, L.M.D. Demarchi, F. Deng, Y.Z. Dengjel, J. Dent, P. Denton, D. Deretic, V. Desai, S.D. Devenish, R.J. Di Gioacchino, M. Di Paolo, G. Di Pietro, C. Díaz-Araya, G. Díaz-Laviada, I. Diaz-Meco, M.T. Diaz-Nido, J. Dikic, I. Dinesh-Kumar, S.P. Ding, W.-X. Distelhorst, C.W. Diwan, A. Djavaheri-Mergny, M. Dokudovskaya, S. Dong, Z. Dorsey, F.C. Dosenko, V. Dowling, J.J. Doxsey, S. Dreux, M. Drew, M.E. Duan, Q. Duchosal, M.A. Duff, K. Dugail, I. Durbeej, M. Duszenko, M. Edelstein, C.L. Edinger, A.L. Egea, G. Eichinger, L. Eissa, N.T. Ekmekcioglu, S. El-Deiry, W.S. Elazar, Z. Elgendy, M. Ellerby, L.M. Er Eng, K. Engelbrecht, A.-M. Engelender, S. Erenpreisa, J. Escalante, R. Esclatine, A. Eskelinen, E.-L. Espert, L. Espina, V. Fan, H. Fan, J. Fan, Q.-W. Fan, Z. Fang, S. Fang, Y. Fanto, M. Fanzani, A. Farkas, T. Farré, J.-C. Faure, M. Fechheimer, M. Feng, C.G. Feng, J. Feng, Q. Feng, Y. Fésüs, L. Feuer, R. Figueiredo-Pereira, M.E. Fimia, G.M. Fingar, D.C. Finkbeiner, S. Finkel, T. Finley, K.D. Fiorito, F. Fisher, E.A. Fisher, P.B. Flajolet, M. Florez-McClure, M.L. Florio, S. Fon, E.A. Fornai, F. Fortunato, F. Fotedar, R. Fowler, D.H. Fox, H.S. Franco, R. Frankel, L.B. Fransen, M. Fuentes, J.M. Fueyo, J. Fujii, J. Fujisaki, K. Fujita, E. Fukuda, M. Furukawa, R.H. Gaestel, M. Gailly, P. Gajewska, M. Galliot, B. Galy, V. Ganesh, S. Ganetzky, B. Ganley, I.G. Gao, F.-B. Gao, G.F. Gao, J. Garcia, L. Garcia-Manero, G. Garcia-Marcos, M. Garmyn, M. Gartel, A.L. Gatti, E. Gautel, M. Gawriluk, T.R. Gegg, M.E. Geng, J. Germain, M. Gestwicki, J.E. Gewirtz, D.A. Ghavami, S. Ghosh, P. Giammarioli, A.M. Giatromanolaki, A.N. Gibson, S.B. Gilkerson, R.W. Ginger, M.L. Ginsberg, H.N. Golab, J. Goligorsky, M.S. Golstein, P. Gomez-Manzano, C. Goncu, E. Gongora, C. Gonzalez, C.D. Gonzalez, R. González-Estévez, C. González-Polo, R.A. Gonzalez-Rey, E. Gorbunov, N.V. Gorski, S. Goruppi, S. Gottlieb, R.A. Gozuacik, D. Granato, G.E. Grant, G.D. Green, K.N. Gregorc, A. Gros, F. Grose, C. Grunt, T.W. Gual, P. Guan, J.-L. Guan, K.-L. Guichard, S.M. Gukovskaya, A.S. Gukovsky, I. Gunst, J. Gustafsson, A.B. Halayko, A.J. Hale, A.N. Halonen, S.K. Hamasaki, M. Han, F. Han, T. Hancock, M.K. Hansen, M. Harada, H. Harada, M. Hardt, S.E. Harper, J.W. Harris, A.L. Harris, J. Harris, S.D. Hashimoto, M. Haspel, J.A. Hayashi, S.-I. Hazelhurst, L.A. He, C. He, Y.-W. Hébert, M.-J. Heidenreich, K.A. Helfrich, M.H. Helgason, G.V. Henske, E.P. Herman, B. Herman, P.K. Hetz, C. Hilfiker, S. Hill, J.A. Hocking, L.J. Hofman, P. Hofmann, T.G. Höhfeld, J. Holyoake, T.L. Hong, M.-H. Hood, D.A. Hotamisligil, G.S. Houwerzijl, E.J. Høyer-Hansen, M. Hu, B. Hu, C.-A.A. Hu, H.-M. Hua, Y. Huang, C. Huang, J. Huang, S. Huang, W.-P. Huber, T.B. Huh, W.-K. Hung, T.-H. Hupp, T.R. Hur, G.M. Hurley, J.B. Hussain, S.N.A. Hussey, P.J. Hwang, J.J. Hwang, S. Ichihara, A. Ilkhanizadeh, S. Inoki, K. Into, T. Iovane, V. Iovanna, J.L. Ip, N.Y. Isaka, Y. Ishida, H. Isidoro, C. Isobe, K.-I. Iwasaki, A. Izquierdo, M. Izumi, Y. Jaakkola, P.M. Jäättelä, M. Jackson, G.R. Jackson, W.T. Janji, B. Jendrach, M. Jeon, J.-H. Jeung, E.-B. Jiang, H. Jiang, H. Jiang, J.X. Jiang, M. Jiang, Q. Jiang, X. Jiménez, A. Jin, M. Jin, S. Joe, C.O. Johansen, T. Johnson, D.E. Johnson, G.V.W. Jones, N.L. Joseph, B. Joseph, S.K. Joubert, A.M. Juhász, G. Juillerat-Jeanneret, L. Jung, C.H. Jung, Y.-K. Kaarniranta, K. Kaasik, A. Kabuta, T. Kadowaki, M. Kagedal, K. Kamada, Y. Kaminskyy, V.O. Kampinga, H.H. Kanamori, H. Kang, C. Kang, K.B. Il Kang, K. Kang, R. Kang, Y.-A. Kanki, T. Kanneganti, T.-D. Kanno, H. Kanthasamy, A.G. Kanthasamy, A. Karantza, V. Kaushal, G.P. Kaushik, S. Kawazoe, Y. Ke, P.-Y. Kehrl, J.H. Kelekar, A. Kerkhoff, C. Kessel, D.H. Khalil, H. Kiel, J.A.K.W. Kiger, A.A. Kihara, A. Kim, D.R. Kim, D.-H. Kim, D.-H. Kim, E.-K. Kim, H.-R. Kim, J.-S. Kim, J.H. Kim, J.C. Kim, J.K. Kim, P.K. Kim, S.W. Kim, Y.-S. Kim, Y. Kimchi, A. Kimmelman, A.C. King, J.S. Kinsella, T.J. Kirkin, V. Kirshenbaum, L.A. Kitamoto, K. Kitazato, K. Klein, L. Klimecki, W.T. Klucken, J. Knecht, E. Ko, B.C.B. Koch, J.C. Koga, H. Koh, J.-Y. Koh, Y.H. Koike, M. Komatsu, M. Kominami, E. Kong, H.J. Kong, W.-J. Korolchuk, V.I. Kotake, Y. Koukourakis, M.I. Kouri Flores, J.B. Kovács, A.L. Kraft, C. Krainc, D. Krämer, H. Kretz-Remy, C. Krichevsky, A.M. Kroemer, G. Krüger, R. Krut, O. Ktistakis, N.T. Kuan, C.-Y. Kucharczyk, R. Kumar, A. Kumar, R. Kumar, S. Kundu, M. Kung, H.-J. Kurz, T. Kwon, H.J. La Spada, A.R. Lafont, F. Lamark, T. Landry, J. Lane, J.D. Lapaquette, P. Laporte, J.F. László, L. Lavandero, S. Lavoie, J.N. Layfield, R. Lazo, P.A. Le, W. Le Cam, L. Ledbetter, D.J. Lee, A.J.X. Lee, B.-W. Lee, G.M. Lee, J. Lee, J.-H. Lee, M. Lee, M.-S. Lee, S.H. Leeuwenburgh, C. Legembre, P. Legouis, R. Lehmann, M. Lei, H.-Y. Lei, Q.-Y. Leib, D.A. Leiro, J. Lemasters, J.J. Lemoine, A. Lesniak, M.S. Lev, D. Levenson, V.V. Levine, B. Levy, E. Li, F. Li, J.-L. Li, L. Li, S. Li, W. Li, X.-J. Li, Y.-B. Li, Y.-P. Liang, C. Liang, Q. Liao, Y.-F. 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Abstract

In 2008 we published the first set of guidelines for standardizing research in autophagy. Since then, research on this topic has continued to accelerate, and many new scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Accordingly, it is important to update these guidelines for monitoring autophagy in different organisms. Various reviews have described the range of assays that have been used for this purpose. Nevertheless, there continues to be confusion regarding acceptable methods to measure autophagy, especially in multicellular eukaryotes. A key point that needs to be emphasized is that there is a difference between measurements that monitor the numbers or volume of autophagic elements (e.g., autophagosomes or autolysosomes) at any stage of the autophagic process vs. those that measure flux through the autophagy pathway (i.e., the complete process); thus, a block in macroautophagy that results in autophagosome accumulation needs to be differentiated from stimuli that result in increased autophagic activity, defined as increased autophagy induction coupled with increased delivery to, and degradation within, lysosomes (in most higher eukaryotes and some protists such as Dictyostelium) or the vacuole (in plants and fungi). In other words, it is especially important that investigators new to the field understand that the appearance of more autophagosomes does not necessarily equate with more autophagy. In fact, in many cases, autophagosomes accumulate because of a block in trafficking to lysosomes without a concomitant change in autophagosome biogenesis, whereas an increase in autolysosomes may reflect a reduction in degradative activity. Here, we present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macroautophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused on these processes. These guidelines are not meant to be a formulaic set of rules, because the appropriate assays depend in part on the question being asked and the system being used. In addition, we emphasize that no individual assay is guaranteed to be the most appropriate one in every situation, and we strongly recommend the use of multiple assays to monitor autophagy. In these guidelines, we consider these various methods of assessing autophagy and what information can, or cannot, be obtained from them. Finally, by discussing the merits and limits of particular autophagy assays, we hope to encourage technical innovation in the field. © 2012 Landes Bioscience.

Published
2012

23. Guidelines for the use and interpretation of assays for monitoring autophagy.

Author

Klionsky, Dj, Abdalla, Fc, Abeliovich, H, Abraham, Rt, Acevedo-Arozena, A, Adeli, K, Agholme, L, Agnello, M, Agostinis, P, Aguirre-Ghiso, Ja, Ahn, Hj, Ait-Mohamed, O, Ait-Si-Ali, S, Akematsu, T, Akira, S, Al-Younes, Hm, Al-Zeer, Ma, Albert, Ml, Albin, Rl, Alegre-Abarrategui, J, Aleo, Mf, Alirezaei, M, Almasan, A, Almonte-Becerril, M, Amano, A, Amaravadi, R, Amarnath, S, Amer, Ao, Andrieu-Abadie, N, Anantharam, V, Ann, Dk, Anoopkumar-Dukie, S, Aoki, H, Apostolova, N, Arancia, G, Aris, Jp, Asanuma, K, Asare, Ny, Ashida, H, Askanas, V, Askew, D, Auberger, P, Baba, M, Backues, Sk, Baehrecke, Eh, Bahr, Ba, Bai, Xy, Bailly, Y, Baiocchi, R, Baldini, G, Balduini, W, Ballabio, A, Bamber, Ba, Bampton, Et, Bánhegyi, G, Bartholomew, Cr, Bassham, Dc, Bast RC, Jr, Batoko, H, Bay, Bh, Beau, I, Béchet, Dm, Begley, Tj, Behl, C, Behrends, C, Bekri, S, Bellaire, B, Bendall, Lj, Benetti, L, Berliocchi, L, Bernardi, H, Bernassola, F, Besteiro, S, Bhatia-Kissova, I, Bi, X, Biard-Piechaczyk, M, Blum, J, 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I, Diaz-Meco, Mt, Diaz-Nido, J, Dikic, I, Dinesh-Kumar, Sp, Ding, Wx, Distelhorst, Cw, Diwan, A, Djavaheri-Mergny, M, Dokudovskaya, S, Dong, Z, Dorsey, Fc, Dosenko, V, Dowling, Jj, Doxsey, S, Dreux, M, Drew, Me, Duan, Q, Duchosal, Ma, Duff, K, Dugail, I, Durbeej, M, Duszenko, M, Edelstein, Cl, Edinger, Al, Egea, G, Eichinger, L, Eissa, Nt, Ekmekcioglu, S, El-Deiry, W, Elazar, Z, Elgendy, M, Ellerby, Lm, Eng, Ke, Engelbrecht, Am, Engelender, S, Erenpreisa, J, Escalante, R, Esclatine, A, Eskelinen, El, Espert, L, Espina, V, Fan, H, Fan, J, Fan, Qw, Fan, Z, Fang, S, Fang, Y, Fanto, M, Fanzani, A, Farkas, T, Farré, Jc, Faure, M, Fechheimer, M, Feng, Cg, Feng, J, Feng, Q, Feng, Y, Fésüs, L, Feuer, R, Figueiredo-Pereira, Me, Fimia, Gm, Fingar, Dc, Finkbeiner, S, Finkel, T, Finley, Kd, Fiorito, F, Fisher, Ea, Fisher, Pb, Flajolet, M, Florez-McClure, Ml, Florio, S, Fon, Ea, Fornai, F, Fortunato, F, Fotedar, R, Fowler, Dh, Fox, H, Franco, R, Frankel, Lb, Fransen, M, Fuentes, Jm, Fueyo, J, 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Harris, J, Harris, Sd, Hashimoto, M, Haspel, Ja, Hayashi, S, Hazelhurst, La, He, C, He, Yw, Hébert, Mj, Heidenreich, Ka, Helfrich, Mh, Helgason, Gv, Henske, Ep, Herman, B, Herman, Pk, Hetz, C, Hilfiker, S, Hill, Ja, Hocking, Lj, Hofman, P, Hofmann, Tg, Höhfeld, J, Holyoake, Tl, Hong, Mh, Hood, Da, Hotamisligil, G, Houwerzijl, Ej, Høyer-Hansen, M, Hu, B, Hu, Ca, Hu, Hm, Hua, Y, Huang, C, Huang, J, Huang, S, Huang, Wp, Huber, Tb, Huh, Wk, Hung, Th, Hupp, Tr, Hur, Gm, Hurley, Jb, Hussain, Sn, Hussey, Pj, Hwang, Jj, Hwang, S, Ichihara, A, Ilkhanizadeh, S, Inoki, K, Into, T, Iovane, V, Iovanna, Jl, Ip, Ny, Isaka, Y, Ishida, H, Isidoro, C, Isobe, K, Iwasaki, A, Izquierdo, M, Izumi, Y, Jaakkola, Pm, Jäättelä, M, Jackson, Gr, Jackson, Wt, Janji, B, Jendrach, M, Jeon, Jh, Jeung, Eb, Jiang, H, Jiang, Jx, Jiang, M, Jiang, Q, Jiang, X, Jiménez, A, Jin, M, Jin, S, Joe, Co, Johansen, T, Johnson, De, Johnson, Gv, Jones, Nl, Joseph, B, Joseph, Sk, Joubert, Am, Juhász, G, Juillerat-Jeanneret, L, Jung, Ch, Jung, Yk, Kaarniranta, K, Kaasik, A, Kabuta, T, Kadowaki, M, Kagedal, K, Kamada, Y, Kaminskyy, Vo, Kampinga, Hh, Kanamori, H, Kang, C, Kang, Kb, Kang, Ki, Kang, R, Kang, Ya, Kanki, T, Kanneganti, Td, Kanno, H, Kanthasamy, Ag, Kanthasamy, A, Karantza, V, Kaushal, Gp, Kaushik, S, Kawazoe, Y, Ke, Py, Kehrl, Jh, Kelekar, A, Kerkhoff, C, Kessel, Dh, Khalil, H, Kiel, Ja, Kiger, Aa, Kihara, A, Kim, Dr, Kim, Dh, Kim, Ek, Kim, Hr, Kim, J, Kim, Jh, Kim, Jc, Kim, Jk, Kim, Pk, Kim, Sw, Kim, Y, Kimchi, A, Kimmelman, Ac, King, J, Kinsella, Tj, Kirkin, V, Kirshenbaum, La, Kitamoto, K, Kitazato, K, Klein, L, Klimecki, Wt, Klucken, J, Knecht, E, Ko, Bc, Koch, Jc, Koga, H, Koh, Jy, Koh, Yh, Koike, M, Komatsu, M, Kominami, E, Kong, Hj, Kong, Wj, Korolchuk, Vi, Kotake, Y, Koukourakis, Mi, Kouri Flores, Jb, Kovács, Al, Kraft, C, Krainc, D, Krämer, H, Kretz-Remy, C, Krichevsky, Am, Kroemer, G, Krüger, R, Krut, O, Ktistakis, Nt, Kuan, Cy, Kucharczyk, R, Kumar, A, Kumar, R, Kumar, S, Kundu, M, Kung, Hj, Kurz, T, Kwon, Hj, La Spada, Ar, Lafont, F, Lamark, T, Landry, J, Lane, Jd, Lapaquette, P, Laporte, Jf, László, L, Lavandero, S, Lavoie, Jn, Layfield, R, Lazo, Pa, Le, W, Le Cam, L, Ledbetter, Dj, Lee, Aj, Lee, Bw, Lee, Gm, Lee, J, Lee, Jh, Lee, M, Lee, Sh, Leeuwenburgh, C, Legembre, P, Legouis, R, Lehmann, M, Lei, Hy, Lei, Qy, Leib, Da, Leiro, J, Lemasters, Jj, Lemoine, A, Lesniak, M, Lev, D, Levenson, Vv, Levine, B, Levy, E, Li, F, Li, Jl, Li, L, Li, S, Li, W, Li, Xj, Li, Yb, Li, Yp, Liang, C, Liang, Q, Liao, Yf, Liberski, Pp, Lieberman, A, Lim, Hj, Lim, Kl, Lim, K, Lin, Cf, Lin, Fc, Lin, J, Lin, Jd, Lin, K, Lin, Ww, Lin, Wc, Lin, Yl, Linden, R, Lingor, P, Lippincott-Schwartz, J, Lisanti, Mp, Liton, Pb, Liu, B, Liu, Cf, Liu, K, Liu, L, Liu, Qa, Liu, W, Liu, Yc, Liu, Y, Lockshin, Ra, Lok, Cn, Lonial, S, Loos, B, Lopez-Berestein, G, López-Otín, C, Lossi, L, Lotze, Mt, Lőw, P, Lu, B, Lu, Z, Luciano, F, Lukacs, Nw, Lund, Ah, Lynch-Day, Ma, Ma, Y, Macian, F, Mackeigan, Jp, Macleod, Kf, Madeo, F, Maiuri, L, Maiuri, Mc, Malagoli, D, Malicdan, Mc, Malorni, W, Man, N, Mandelkow, Em, Manon, S, Manov, I, Mao, K, Mao, X, Mao, Z, Marambaud, P, Marazziti, D, Marcel, Yl, Marchbank, K, Marchetti, P, Marciniak, Sj, Marcondes, M, Mardi, M, Marfe, G, Mariño, G, Markaki, M, Marten, Mr, Martin, Sj, Martinand-Mari, C, Martinet, W, Martinez-Vicente, M, Masini, M, Matarrese, P, Matsuo, S, Matteoni, R, Mayer, A, Mazure, Nm, Mcconkey, Dj, Mcconnell, Mj, Mcdermott, C, Mcdonald, C, Mcinerney, Gm, Mckenna, Sl, Mclaughlin, B, Mclean, Pj, Mcmaster, Cr, Mcquibban, Ga, Meijer, Aj, Meisler, Mh, Meléndez, A, Melia, Tj, Melino, G, Mena, Ma, Menendez, Ja, Menna-Barreto, Rf, Menon, Mb, Menzies, Fm, Mercer, Ca, Merighi, A, Merry, De, Meschini, S, Meyer, Cg, Meyer, Tf, Miao, Cy, Miao, Jy, Michels, Pa, Michiels, C, Mijaljica, D, Milojkovic, A, Minucci, S, Miracco, C, Miranti, Ck, Mitroulis, I, Miyazawa, K, Mizushima, N, Mograbi, B, Mohseni, S, Molero, X, Mollereau, B, Mollinedo, F, Momoi, T, Monastyrska, I, Monick, Mm, Monteiro, Mj, Moore, Mn, Mora, R, Moreau, K, Moreira, Pi, Moriyasu, Y, Moscat, J, Mostowy, S, Mottram, Jc, Motyl, T, Moussa, Ce, Müller, S, Muller, S, Münger, K, Münz, C, Murphy, Lo, Murphy, Me, Musarò, A, Mysorekar, I, Nagata, E, Nagata, K, Nahimana, A, Nair, U, Nakagawa, T, Nakahira, K, Nakano, H, Nakatogawa, H, Nanjundan, M, Naqvi, Ni, Narendra, Dp, Narita, M, Navarro, M, Nawrocki, St, Nazarko, Ty, Nemchenko, A, Netea, Mg, Neufeld, Tp, Ney, Pa, Nezis, Ip, Nguyen, Hp, Nie, D, Nishino, I, Nislow, C, Nixon, Ra, Noda, T, Noegel, Aa, Nogalska, A, Noguchi, S, Notterpek, L, Novak, I, Nozaki, T, Nukina, N, Nürnberger, T, Nyfeler, B, Obara, K, Oberley, Td, Oddo, S, Ogawa, M, Ohashi, T, Okamoto, K, Oleinick, Nl, Oliver, Fj, Olsen, Lj, Olsson, S, Opota, O, Osborne, Tf, Ostrander, Gk, Otsu, K, Ou, Jh, Ouimet, M, Overholtzer, M, Ozpolat, B, Paganetti, P, Pagnini, U, Pallet, N, Palmer, Ge, Palumbo, C, Pan, T, Panaretakis, T, Pandey, Ub, Papackova, Z, Papassideri, I, Paris, I, Park, J, Park, Ok, Parys, Jb, Parzych, Kr, Patschan, S, Patterson, C, Pattingre, S, Pawelek, Jm, Peng, J, Perlmutter, Dh, Perrotta, I, Perry, G, Pervaiz, S, Peter, M, Peters, Gj, Petersen, M, Petrovski, G, Phang, Jm, Piacentini, M, Pierre, P, Pierrefite-Carle, V, Pierron, G, Pinkas-Kramarski, R, Piras, A, Piri, N, Platanias, Lc, Pöggeler, S, Poirot, M, Poletti, A, Poüs, C, Pozuelo-Rubio, M, Prætorius-Ibba, M, Prasad, A, Prescott, M, Priault, M, Produit-Zengaffinen, N, Progulske-Fox, A, Proikas-Cezanne, T, Przedborski, S, Przyklenk, K, Puertollano, R, Puyal, J, Qian, Sb, Qin, L, Qin, Zh, Quaggin, Se, Raben, N, Rabinowich, H, Rabkin, Sw, Rahman, I, Rami, A, Ramm, G, Randall, G, Randow, F, Rao, Va, Rathmell, Jc, Ravikumar, B, Ray, Sk, Reed, Bh, Reed, Jc, Reggiori, F, Régnier-Vigouroux, A, Reichert, A, Reiners JJ, Jr, Reiter, Rj, Ren, J, Revuelta, Jl, Rhodes, Cj, Ritis, K, Rizzo, E, Robbins, J, Roberge, M, Roca, H, Roccheri, Mc, Rocchi, S, Rodemann, Hp, Rodríguez de Córdoba, S, Rohrer, B, Roninson, Ib, Rosen, K, Rost-Roszkowska, Mm, Rouis, M, Rouschop, Km, Rovetta, F, Rubin, Bp, Rubinsztein, Dc, Ruckdeschel, K, Rucker EB, 3rd, Rudich, A, Rudolf, E, Ruiz-Opazo, N, Russo, R, Rusten, Te, Ryan, Km, Ryter, Sw, Sabatini, Dm, Sadoshima, J, Saha, T, Saitoh, T, Sakagami, H, Sakai, Y, Salekdeh, Gh, Salomoni, P, Salvaterra, Pm, Salvesen, G, Salvioli, R, Sanchez, Am, Sánchez-Alcázar, Ja, Sánchez-Prieto, R, Sandri, M, Sankar, U, Sansanwal, P, Santambrogio, L, Saran, S, Sarkar, S, Sarwal, M, Sasakawa, C, Sasnauskiene, A, Sass, M, Sato, K, Sato, M, Schapira, Ah, Scharl, M, Schätzl, Hm, Scheper, W, Schiaffino, S, Schneider, C, Schneider, Me, Schneider-Stock, R, Schoenlein, Pv, Schorderet, Df, Schüller, C, Schwartz, Gk, Scorrano, L, Sealy, L, Seglen, Po, Segura-Aguilar, J, Seiliez, I, Seleverstov, O, Sell, C, Seo, Jb, Separovic, D, Setaluri, V, Setoguchi, T, Settembre, C, Shacka, Jj, Shanmugam, M, Shapiro, Im, Shaulian, E, Shaw, Rj, Shelhamer, Jh, Shen, Hm, Shen, Wc, Sheng, Zh, Shi, Y, Shibuya, K, Shidoji, Y, Shieh, Jj, Shih, Cm, Shimada, Y, Shimizu, S, Shintani, T, Shirihai, O, Shore, Gc, Sibirny, Aa, Sidhu, Sb, Sikorska, B, Silva-Zacarin, Ec, Simmons, A, Simon, Ak, Simon, Hu, Simone, C, Simonsen, A, Sinclair, Da, Singh, R, Sinha, D, Sinicrope, Fa, Sirko, A, Siu, Pm, Sivridis, E, Skop, V, Skulachev, Vp, Slack, R, Smaili, S, Smith, Dr, Soengas, M, Soldati, T, Song, X, Sood, Ak, Soong, Tw, Sotgia, F, Spector, Sa, Spies, Cd, Springer, W, Srinivasula, Sm, Stefanis, L, Steffan, J, Stendel, R, Stenmark, H, Stephanou, A, Stern, St, Sternberg, C, Stork, B, Strålfors, P, Subauste, C, Sui, X, Sulzer, D, Sun, J, Sun, Sy, Sun, Zj, Sung, Jj, Suzuki, K, Suzuki, T, Swanson, M, Swanton, C, Sweeney, St, Sy, Lk, Szabadkai, G, Tabas, I, Taegtmeyer, H, Tafani, M, Takács-Vellai, K, Takano, Y, Takegawa, K, Takemura, G, Takeshita, F, Talbot, Nj, Tan, K, Tanaka, K, Tang, D, Tanida, I, Tannous, Ba, Tavernarakis, N, Taylor, G, Taylor, Ga, Taylor, Jp, Terada, L, Terman, A, Tettamanti, G, Thevissen, K, Thompson, Cb, Thorburn, A, Thumm, M, Tian, F, Tian, Y, Tocchini-Valentini, G, Tolkovsky, Am, Tomino, Y, Tönges, L, Tooze, Sa, Tournier, C, Tower, J, Towns, R, Trajkovic, V, Travassos, Lh, Tsai, Tf, Tschan, Mp, Tsubata, T, Tsung, A, Turk, B, Turner, L, Tyagi, Sc, Uchiyama, Y, Ueno, T, Umekawa, M, Umemiya-Shirafuji, R, Unni, Vk, Vaccaro, Mi, Valente, Em, Van den Berghe, G, van der Klei, Ij, van Doorn, W, van Dyk, Lf, van Egmond, M, van Grunsven, La, Vandenabeele, P, Vandenberghe, Wp, Vanhorebeek, I, Vaquero, Ec, Velasco, G, Vellai, T, Vicencio, Jm, Vierstra, Rd, Vila, M, Vindis, C, Viola, G, Viscomi, Maria Teresa, Voitsekhovskaja, Ov, von Haefen, C, Votruba, M, Wada, K, Wade-Martins, R, Walker, Cl, Walsh, Cm, Walter, J, Wan, Xb, Wang, A, Wang, C, Wang, D, Wang, F, Wang, G, Wang, H, Wang, Hg, Wang, Hd, Wang, J, Wang, K, Wang, M, Wang, Rc, Wang, X, Wang, Yj, Wang, Y, Wang, Z, Wang, Zc, Wansink, Dg, Ward, Dm, Watada, H, Waters, Sl, Webster, P, Wei, L, Weihl, Cc, Weiss, Wa, Welford, Sm, Wen, Lp, Whitehouse, Ca, Whitton, Jl, Whitworth, Aj, Wileman, T, Wiley, Jw, Wilkinson, S, Willbold, D, Williams, Rl, Williamson, Pr, Wouters, Bg, Wu, C, Wu, Dc, Wu, Wk, Wyttenbach, A, Xavier, Rj, Xi, Z, Xia, P, Xiao, G, Xie, Z, Xu, Dz, Xu, J, Xu, L, Xu, X, Yamamoto, A, Yamashina, S, Yamashita, M, Yan, X, Yanagida, M, Yang, D, Yang, E, Yang, Jm, Yang, Sy, Yang, W, Yang, Wy, Yang, Z, Yao, Mc, Yao, Tp, Yeganeh, B, Yen, Wl, Yin, Jj, Yin, Xm, Yoo, Oj, Yoon, G, Yoon, Sy, Yorimitsu, T, Yoshikawa, Y, Yoshimori, T, Yoshimoto, K, You, Hj, Youle, Rj, Younes, A, Yu, L, Yu, Sw, Yu, Wh, Yuan, Zm, Yue, Z, Yun, Ch, Yuzaki, M, Zabirnyk, O, Silva-Zacarin, E, Zacks, D, Zacksenhaus, E, Zaffaroni, N, Zakeri, Z, Zeh HJ, 3rd, Zeitlin, So, Zhang, H, Zhang, Hl, Zhang, J, Zhang, Jp, Zhang, L, Zhang, My, Zhang, Xd, Zhao, M, Zhao, Yf, Zhao, Y, Zhao, Zj, Zheng, X, Zhivotovsky, B, Zhong, Q, Zhou, Cz, Zhu, C, Zhu, Wg, Zhu, Xf, Zhu, X, Zhu, Y, Zoladek, T, Zong, Wx, Zorzano, A, Zschocke, J, Zuckerbraun, B., and Viscomi M. T. (ORCID:0000-0002-9096-4967)

Abstract

In 2008 we published the first set of guidelines for standardizing research in autophagy. Since then, research on this topic has continued to accelerate, and many new scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Accordingly, it is important to update these guidelines for monitoring autophagy in different organisms. Various reviews have described the range of assays that have been used for this purpose. Nevertheless, there continues to be confusion regarding acceptable methods to measure autophagy, especially in multicellular eukaryotes. A key point that needs to be emphasized is that there is a difference between measurements that monitor the numbers or volume of autophagic elements (e.g., autophagosomes or autolysosomes) at any stage of the autophagic process vs. those that measure flux through the autophagy pathway (i.e., the complete process); thus, a block in macroautophagy that results in autophagosome accumulation needs to be differentiated from stimuli that result in increased autophagic activity, defined as increased autophagy induction coupled with increased delivery to, and degradation within, lysosomes (in most higher eukaryotes and some protists such as Dictyostelium) or the vacuole (in plants and fungi). In other words, it is especially important that investigators new to the field understand that the appearance of more autophagosomes does not necessarily equate with more autophagy. In fact, in many cases, autophagosomes accumulate because of a block in trafficking to lysosomes without a concomitant change in autophagosome biogenesis, whereas an increase in autolysosomes may reflect a reduction in degradative activity. Here, we present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macroautophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused o

Published
2012

24. Male and female fertility preservation

Author

Berthelot-ricou, A., primary, Perrin, J., additional, Roustan, A., additional, Di Giorgio, C., additional, De Meo, M., additional, Botta, A., additional, Orsiere, T., additional, Courbiere, B., additional, Martinez, J. G., additional, Botella, I. M., additional, Casas, I. P., additional, Novella-Maestre, E., additional, Colom, P. J. F., additional, Rubio, J., additional, Martinez, A. P., additional, Rodriguez-Wallberg, K. A., additional, de Mena, S. A., additional, Malm, E., additional, Larsson, A., additional, Kuiper, R., additional, Hassan, M., additional, Herraiz, S., additional, Rodriguez-Iglesias, B., additional, Diaz-Garcia, C., additional, Mirabet, V., additional, Pellicer, A., additional, Aljaser, F. S., additional, Medrano, J. H., additional, Rhodes, S., additional, Tomlinson, M. J., additional, Campbell, B. K., additional, Dong, F., additional, Shi, S., additional, Dai, S., additional, Liu, X., additional, Su, Y., additional, Guo, Y., additional, Wang, F., additional, Xin, Z., additional, Song, W., additional, Jin, H., additional, Sun, Y., additional, Ortega-Hrepich, C., additional, Stoop, D., additional, Guzman, L., additional, Van Landuyt, L., additional, Tournaye, H., additional, Smitz, J., additional, De Vos, M., additional, Diaz, C., additional, Vera, F., additional, Youm, H., additional, Lee, J., additional, Lee, J. r., additional, Lee, J. y., additional, Jee, B. c., additional, Suh, C. s., additional, Kim, S. h., additional, Lotz, L., additional, Hoffmann, I., additional, Muller, A., additional, Hackl, J., additional, Schulz, C., additional, Reissmann, C., additional, Cupisti, S., additional, Oppelt, P. G., additional, Heusinger, K., additional, Hildebrandt, T., additional, Beckmann, M. W., additional, Dittrich, R., additional, Klinger, F., additional, Rossi, V., additional, Lispi, M., additional, Longobardi, S., additional, De Felici, M., additional, Fabbri, R., additional, Vicenti, R., additional, Martino, N. A., additional, Parazza, I., additional, Macciocca, M., additional, Magnani, V., additional, Pasquinelli, G., additional, Dell'Aquila, M. E., additional, Venturoli, S., additional, Fisch, B., additional, Orvieto, R., additional, Fisher, N., additional, Ben-Haroush, A., additional, Stein, A., additional, Abir, R., additional, Al-Samerria, S., additional, McFarlane, J., additional, Almahbobi, G., additional, Klocke, S., additional, Tappehorn, C., additional, and Griesinger, G., additional

Published
2013
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26. Isolation of highly purified type A spermatogonia from prepubertal rat testis

Author

Morena, Ar, Boitani, Carla, Pesce, M, DE FELICI, M, and Stefanini, Mario

Subjects
Male, Cell Survival, Cell Separation, Immunohistochemistry, Spermatogonia, Rats, Microscopy, Electron, Proto-Oncogene Proteins c-kit, Testis, Animals, RNA, Messenger, Sexual Maturation, Rats, Wistar, Cells, Cultured
Abstract

We have developed a new method that allows isolation of highly purified type A spermatogonia from prepubertal rats. The procedure is based on the maximal release of spermatogonia from the seminiferous epithelium obtained by the complete enzymatic digestion of the tubular basal lamina, followed by removal of contaminating somatic cells through adhesion to plastic dishes coated with the lectin Datura stramonium agglutinin and fractionation on a discontinuous Percoll gradient. The cell suspension obtained contains up to 85% type A spermatogonia. Besides morphological criteria, the identification of germ cells and somatic cells has been performed by means of immunocytochemical markers, such as c-kit receptor, which is present only in germ cells, and vimentin, which is present only in somatic cells. All type A spermatogonia isolated were c-kit positive, thus suggesting that c-kit receptor is present in both undifferentiated and differentiating type A spermatogonia. Preliminary culture experiments demonstrate that spermatogonia survival in vitro was significantly improved by the addition of 10% fetal calf serum or horse serum to the culture medium; however, optimal culture conditions remain to be established. In vitro studies on isolated spermatogonia may provide a significant contribution toward elucidation of the mechanisms regulating spermatogonial proliferation and differentiation.

Published
1996

30. Cftr gene targeting in mouse embryonic stem cells mediated by Small Fragment Homologous Replacement (SFHR)

Author

Casavola, Maria Favia, Giuseppe Novelli, Emanuela M. Bruscia, Antonio Filareto, Gruenert Dc, Paola Spitalieri, Federica Sangiuolo, Ruggiero Mango, Lorenzo Guerra, Maria Lucia Scaldaferri, Rosa Caroppo, and De Felici M

Subjects
mice, cloning, dna, Biology, video, Article, gene targeting, stem cells, motor neurons, rna, Site-specific recombinase technology, molecular, Cloning, Molecular, Gene, Microscopy, Video, Settore BIO/17, Oligonucleotide, cystic fibrosis transmembrane conductance regulator, Gene targeting, Transfection, embryonic stem cells, Molecular biology, Genetic techniques, microscopy, video, microscopy, fluorescence, mutation, cloning, molecular, animals, reverse transcriptase polymerase chain reaction, Transplantation, genomic DNA, Microscopy, Fluorescence, microscopy, fluorescence, Stem cell
Abstract

Different gene targeting approaches have been developed to modify endogenous genomic DNA in both human and mouse cells. Briefly, the process involves the targeting of a specific mutation in situ leading to the gene correction and the restoration of a normal gene function. Most of these protocols with therapeutic potential are oligonucleotide based, and rely on endogenous enzymatic pathways. One gene targeting approach, "Small Fragment Homologous Replacement (SFHR)", has been found to be effective in modifying genomic DNA. This approach uses small DNA fragments (SDF) to target specific genomic loci and induce sequence and subsequent phenotypic alterations. This study shows that SFHR can stably introduce a 3-bp deletion (deltaF508, the most frequent cystic fibrosis (CF) mutation) into the Cftr (CF Transmembrane Conductance Regulator) locus in the mouse embryonic stem (ES) cell genome. After transfection of deltaF508-SDF into murine ES cells, SFHR-mediated modification was evaluated at the molecular levels on DNA and mRNA obtained from transfected ES cells. About 12% of transcript corresponding to deleted allele was detected, while 60% of the electroporated cells completely lost any measurable CFTR-dependent chloride efflux. The data indicate that the SFHR technique can be used to effectively target and modify genomic sequences in ES cells. Once the SFHR-modified ES cells differentiate into different cell lineages they can be useful for elucidating tissue-specific gene function and for the development of transplantation-based cellular and therapeutic protocols.

Published
2008
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35. Effect of Follicle-stimulating Hormone on Cyclic Adenosine Monophosphate Level and on Meiotic Maturation in Mouse Cumulus Cell-enclosed Oocytes Cultured in Vitro1

Author

Salustri, A., Petrungaro, S., De Felici, M., Conti, M., and Siracusa, G.

Abstract

We have reported that in vitro treatment with follicle-stimulating hormone (FSH) delays by about 3 h spontaneous meiotic resumption in cumulus cell-enclosed mouse oocytes. In the present paper we show that the temporary meiotic block is accompanied by a transient increase of cAMP concentration in the oocyte. In cumulus cell-oocyte complexes stimulated with 1 μg/ml FSH, cAMP significantly increases within 1 h both in the whole complex (from a basal value of 1.9 ± 0.2 to 169 ± 13 fmol) and in the enclosed oocyte (from 0.9 ± 0.2 to 2.4 ± 0.2 fmol), then progressively decreases to basal values. Stimulation by FSH does not cause any cAMP increase in denuded oocytes. As the concentration of cAMP in the cells decreases, the percentage of oocytes escaping the meiotic block imposed by FSH increases. If the complexes are cultured in the presence of 1 μg/m1 FSH plus 1 mM isobutyl-1-methylxanthine (IBMX), cAMP concentration increases approximately 250-fold in the complex, and 10-fold in the enclosed oocyte; the level of cAMP in the oocyte drops very rapidly (50% degradation in less than 2 min) if the oocyte is then transferred to IBMX-free medium. The data are discussed in terms of the possible role of cAMP transfer from cumulus cells to the oocyte in the regulation of meiotic progression in mouse oocytes.

Published
1985
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36. To Be or Not to Be a Germ Cell: The Extragonadal Germ Cell Tumor Paradigm

Author

Marco Barchi, Susanna Dolci, Carmela Rita Balistreri, Francesca Gioia Klinger, Federica Campolo, Massimo De Felici, De Felici M., Klinger F.G., Campolo F., Balistreri C.R., Barchi M., and Dolci S.

Subjects
Epigenomics, Male, Pluripotent Stem Cells, endocrine system, Cell type, Transcription, Genetic, QH301-705.5, Population, Review, Biology, germline, Catalysis, Germline, Inorganic Chemistry, Testicular Neoplasms, medicine, primordial germ cells, Humans, Epigenetics, Biology (General), Physical and Theoretical Chemistry, education, Gonads, QD1-999, Molecular Biology, Spectroscopy, education.field_of_study, Settore BIO/16, Organic Chemistry, EG cells, Teratoma, Embryo, germ cell tumor, Cell Differentiation, General Medicine, Neoplasms, Germ Cell and Embryonal, medicine.disease, Computer Science Applications, Cell biology, Chemistry, medicine.anatomical_structure, Germ Cells, Extragonadal Germ Cell Tumor, Germ cell tumors, Germ cell
Abstract

In the human embryo, the genetic program that orchestrates germ cell specification involves the activation of epigenetic and transcriptional mechanisms that make the germline a unique cell population continuously poised between germness and pluripotency. Germ cell tumors, neoplasias originating from fetal or neonatal germ cells, maintain such dichotomy and can adopt either pluripotent features (embryonal carcinomas) or germness features (seminomas) with a wide range of phenotypes in between these histotypes. Here, we review the basic concepts of cell specification, migration and gonadal colonization of human primordial germ cells (hPGCs) highlighting the analogies of transcriptional/epigenetic programs between these two cell types.

Published
2021

37. Low-affinity nerve growth factor receptor is expressed during testicular morphogenesis and in germ cells at specific stages of spermatogenesis

Author

M De Felici, A. Cattaneo, A. Fradeani, L. Rienzi, T. Odorisio, Mario A. Russo, Gregorio Siracusa, Russo, Ma, Odorisio, T, Fradeani, A, Rienzi, L, DE FELICI, M, Cattaneo, Antonino, and Siracusa, G.

Subjects
Male, medicine.medical_specialty, Messenger, Morphogenesis, Wistar, Gene Expression, In situ hybridization, Receptors, Nerve Growth Factor, Testicle, Biology, Mice, Spermatocytes, Internal medicine, Gene expression, Testis, Receptors, Nerve Growth Factor, Genetics, medicine, Low-affinity nerve growth factor receptor, In Situ Hybridization, Immunohistochemistry, Rats, Wistar, Rats, Spermatogenesis, Animals, Spermatids, Spermatozoa, RNA, Messenger, Northern blot, Settore BIO/17, Cell Biology, Cell biology, medicine.anatomical_structure, Endocrinology, Nerve growth factor, RNA, Developmental Biology
Abstract

Nerve growth factor (NGF) is essential for neuronal development and differentiation. Recent reports have shown that its low-affinity receptor (LNGFR) is expressed and developmentally regulated in a broad range of embryonic and adult tissues outside the nervous system, although the functions of the receptor in such tissues remain unknown. Recently, NGF and LNGFR have been detected in adult mouse, rat, and human testis. The results of the present work demonstrate that LNGFR is expressed much before the onset of spermatogenesis in both mouse and rat testis. In situ hybridization shows that the mRNA for LNGFR is expressed in the peritubular cells of the embryonic mouse testis. Immunohistochemical analysis of the rat testis shows LNGFR-expressing cells to be scattered in the intertubular compartment in the embryonic testis, and to become organized in a cellular layer that surrounds myoid cells of the seminiferous tubules during postnatal development. Furthermore, in peripuberal and adult mouse and rat testis we have identified the expression of an abundant and shorter mRNA of 3.2 kb that cross hybridizes to the low-affinity NGF receptor transcript (3.7 kb). This shorter mRNA species, which appears at the beginning of spermatogenesis in the adult, has been identified by in situ hybridization and by Northern blot with RNA isolated from homogeneous populations of meiotic germ cells to be expressed by pachytene spermatocytes and round spermatids. Our results suggest a complex developmental role for LNGFR during testicular morphogenesis and identify the expression, at specific stages of spermatogenesis, of a new germ cell-specific transcript homologous to the receptor RNA.

38. Embryotoxicity assays for leached components from dental restorative materials

Author

Donatella Farini, Vincenzo Campanella, G Gallusi, Francesca Gioia Klinger, Massimo De Felici, Stefano Mummolo, Giuseppe Marzo, A Libonati, Simona Tecco, Libonati, A, Marzo, G, Klinger, Fg, Farini, D, Gallusi, G, Tecco, Simona, Mummolo, S, De Felici, M, and Campanella, V.

Subjects
lcsh:QH471-489, Embryonic Development, Dentistry, Apoptosis, engineering.material, lcsh:Gynecology and obstetrics, Composite Resins, Dental Amalgam, Embryo Culture Techniques, Andrology, Dental Materials, Mice, Endocrinology, In vivo, Materials Testing, Toxicity Tests, medicine, lcsh:Reproduction, Animals, Embryo Implantation, Blastocyst, Dental Restoration, Permanent, lcsh:RG1-991, Settore BIO/17, business.industry, Chemistry, Research, Reproducibility of Results, Obstetrics and Gynecology, Embryo Transfer, Embryo transfer, In vitro, Teratology, Amalgam (dentistry), Transplantation, Teratogens, medicine.anatomical_structure, Solubility, Reproductive Medicine, Culture Media, Conditioned, Toxicity, engineering, Ectogenesis, Female, business, Developmental Biology
Abstract

Background Currently, there are no suitable assays available to evaluate the embryotoxicity of leached components from restorative dental materials. Methods The effect of the medium conditioned by composites and amalgam on mouse blastocysts in vitro was tested. The materials were also subcutaneously implanted, and the effect of the medium supplemented with serum from the host blood was evaluated in the embryotoxicity assay. The embryo implantation rate in the material-transplanted mothers was also evaluated. Results The results show that while the culture in media conditioned by amalgams did not affect blastocyst development, the medium conditioned by composites caused blastocyst degeneration and apoptosis. The development of blastocysts in a medium containing serum obtained from animals after transplantation was, however, without effect. Finally, inconsistent reduction in the implantation rate in transplanted mothers was observed. Conclusions In this study, we provide examples of in vitro and in vivo tests that may be used to evaluate embryotoxicity for dental materials. Our results show that leached components from our composite-material induced embryotoxicity in vitro, however, no toxicity was observed when subcutaneously implanted in vivo. This highlights the necessity of integrated in vitro and in vivo tests for valuable predictive estimation of embryotoxicity for complex materials.

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39. Gliotic Response and Reprogramming Potential of Human Müller Cell Line MIO-M1 Exposed to High Glucose and Glucose Fluctuations.

Author

Russo B, D'Addato G, Salvatore G, Menduni M, Frontoni S, Carbone L, Camaioni A, Klinger FG, De Felici M, Picconi F, and La Sala G

Subjects
Humans, Cell Line, Diabetic Retinopathy metabolism, Diabetic Retinopathy pathology, Vimentin metabolism, SOXB1 Transcription Factors metabolism, SOXB1 Transcription Factors genetics, Gliosis metabolism, Gliosis pathology, Glial Fibrillary Acidic Protein metabolism, Hedgehog Proteins metabolism, Hedgehog Proteins genetics, Ependymoglial Cells metabolism, Ependymoglial Cells drug effects, Glucose metabolism, Glucose pharmacology, Cellular Reprogramming
Abstract

Retinal neurodegeneration (RN), an early marker of diabetic retinopathy (DR), is closely associated with Müller glia cells (MGs) in diabetic subjects. MGs play a pivotal role in maintaining retinal homeostasis, integrity, and metabolic support and respond to diabetic stress. In lower vertebrates, MGs have a strong regenerative response and can completely repair the retina after injuries. However, this ability diminishes as organisms become more complex. The aim of this study was to investigate the gliotic response and reprogramming potential of the human Müller cell line MIO-M1 cultured in normoglycemic (5 mM glucose, NG) and hyperglycemic (25 mM glucose, HG) conditions and then exposed to sustained high-glucose and glucose fluctuation (GF) treatments to mimic the human diabetic conditions. The results showed that NG MIO-M1 cells exhibited a dynamic activation to sustained high-glucose and GF treatments by increasing GFAP and Vimentin expression together, indicative of gliotic response. Increased expression of SHH and SOX2 were also observed, foreshadowing reprogramming potential. Conversely, HG MIO-M1 cells showed increased levels of the indexes reported above and adaptation/desensitization to sustained high-glucose and GF treatments. These findings indicate that MIO-M1 cells exhibit a differential response under various glucose treatments, which is dependent on the metabolic environment. The in vitro model used in this study, based on a well-established cell line, enables the exploration of how these responses occur in a controlled, reproducible system and the identification of strategies to promote neurogenesis over neurodegeneration. These findings contribute to the understanding of MGs responses under diabetic conditions, which may have implications for future therapeutic approaches to diabetes-associated retinal neurodegeneration.

Published
2024
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42. Sleep deprivation causes gut dysbiosis impacting on systemic metabolomics leading to premature ovarian insufficiency in adolescent mice.

Author

Yan J, Zhang X, Zhu K, Yu M, Liu Q, De Felici M, Zhang T, Wang J, and Shen W

Subjects
Animals, Female, Mice, Ovarian Follicle metabolism, Oocytes metabolism, Fecal Microbiota Transplantation, Disease Models, Animal, Apoptosis, Primary Ovarian Insufficiency metabolism, Gastrointestinal Microbiome, Dysbiosis microbiology, Dysbiosis metabolism, Metabolomics methods, Sleep Deprivation complications, Sleep Deprivation metabolism
Abstract

Rationale: Currently, there are occasional reports of health problems caused by sleep deprivation (SD). However, to date, there remains a lack of in-depth research regarding the effects of SD on the growth and development of oocytes in females. The present work aimed to investigate whether SD influences ovarian folliculogenesis in adolescent female mice. Methods: Using a dedicated device, SD conditions were established in 3-week old female mice (a critical stage of follicular development) for 6 weeks and gut microbiota and systemic metabolomics were analyzed. Analyses were related to parameters of folliculogenesis and reproductive performance of SD females. Results: We found that the gut microbiota and systemic metabolomics were severely altered in SD females and that these were associated with parameters of premature ovarian insufficiency (POI). These included increased granulosa cell apoptosis, reduced numbers of primordial follicles (PmFs), correlation with decreased AMH, E2, and increased LH in blood serum, and a parallel increased number of growing follicles and changes in protein expression compatible with PmF activation. SD also reduced oocyte maturation and reproductive performance. Notably, fecal microbial transplantation from SD females into normal females induced POI parameters in the latter while niacinamide (NAM) supplementation alleviated such symptoms in SD females. Conclusion: Gut microbiota and alterations in systemic metabolomics caused by SD induced POI features in juvenile females that could be counteracted with NAM supplementation., Competing Interests: Competing Interests: The authors have declared that no competing interest exists., (© The author(s).)

Published
2024
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43. NAD + precursors promote the restoration of spermatogenesis in busulfan-treated mice through inhibiting Sirt2-regulated ferroptosis.

Author

Feng YQ, Liu X, Zuo N, Yu MB, Bian WM, Han BQ, Sun ZY, De Felici M, Shen W, and Li L

Subjects
Animals, Male, Mice, Disease Models, Animal, Testis metabolism, Testis drug effects, Azoospermia drug therapy, Azoospermia metabolism, Azoospermia chemically induced, Busulfan pharmacology, Spermatogenesis drug effects, NAD metabolism, Ferroptosis drug effects, Sirtuin 2 metabolism, Sirtuin 2 genetics
Abstract

Rationale: In recent years, nicotinamide adenine dinucleotide (NAD + ) precursors (Npre) have been widely employed to ameliorate female reproductive problems in both humans and animal models. However, whether and how Npre plays a role in the male reproductive disorder has not been fully clarified. Methods: In the present study, a busulfan-induced non-obstructive azoospermic mouse model was used, and Npre was administered for five weeks following the drug injection, with the objective of reinstating spermatogenesis and fertility. Initially, we assessed the NAD + level, germ cell types, semen parameters and sperm fertilization capability. Subsequently, testis tissues were examined through RNA sequencing analysis, ELISA, H&E, immunofluorescence, quantitative real-time PCR, and Western blotting techniques. Results: The results indicated that Npre restored normal level of NAD + in blood and significantly alleviated the deleterious effects of busulfan (BU) on spermatogenesis, thereby partially reestablishing fertilization capacity. Transcriptome analysis, along with recovery of testicular Fe 2+ , GSH, NADPH, and MDA levels, impaired by BU, and the fact that Fer-1, an inhibitor of ferroptosis, restored spermatogenesis and semen parameters close to CTRL values, supported such possibility. Interestingly, the reduction in SIRT2 protein level by the specific inhibitor AGK2 attenuated the beneficial effects of Npre on spermatogenesis and ferroptosis by affecting PGC-1α and ACLY protein levels, thus suggesting how these compounds might confer spermatogenesis protection. Conclusion: Collectively, these findings indicate that NAD + protects spermatogenesis against ferroptosis, probably through SIRT2 dependent mechanisms. This underscores the considerable potential of Npre supplementation as a feasible strategy for preserving or restoring spermatogenesis in specific conditions of male infertility and as adjuvant therapy to preserve male fertility in cancer patients receiving sterilizing treatments., Competing Interests: Competing Interests: The authors have declared that no competing interest exists., (© The author(s).)

Published
2024
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44. In vitro oogenesis from murine premeiotic germ cells using a new three-dimensional culture system.

Author

Wang L, Yan ZH, He TR, Liu HX, Li YK, Niu YL, Wang JJ, De Felici M, Ge W, and Shen W

Abstract

A faithful reconstitution of the complete process of oogenesis in vitro is helpful for understanding the molecular mechanisms, genetics, and epigenetic changes related to gametogenesis; it can also be useful for clinical drug screening, disease research, and regenerative medicine. To this end, given the consensus that murine female germ cells initiate meiosis at E13.5, substantial works have reported the successful generation of fertile oocytes using E12.5 female gonads as starting materials. Nevertheless, our data demonstrated that murine germ cells at E12.5 have heterogeneously initiated a meiotic transcriptional program based on a measurement of pre-mRNAs (unspliced) and mature mRNAs (spliced) at a single-cell level. Therefore, to establish a platform that faithfully recapitulates the entire process in vitro (from premeiotic murine germ cells to fully developed oocytes), we here report a novel three-dimensional organoid culture (3-DOC) system, which successfully induced fully developed oocytes from E11.5 premeiotic female germ cells (oogonia). Compared with 2D culture and other 3D culture methods, this new culture system is more cost-effective and can create high-quality oocytes similar to in vivo oocytes. In summary, our new culture platform provides an experimental model for future research in regenerative medicine and reproductive biology., (© 2023. The Author(s).)

Published
2023
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45. Aflatoxin B1 disrupts testicular development via the cell cycle-related Ras/PI3K/Akt signaling in mice and pig.

Author

Zhang FL, Ma HH, Dong PY, Yuan ZN, Zhang SE, Zhao AH, Liu HQ, De Felici M, Shen W, and Zhang XF

Subjects
Animals, Humans, Male, Mice, Cell Division, Phosphatidylinositol 3-Kinases metabolism, Signal Transduction, Swine, Aflatoxin B1 toxicity, Cell Cycle, Proto-Oncogene Proteins c-akt metabolism
Abstract

Aflatoxins B1 (AFB1), a type I carcinogen widely present in the environment, not only poses a danger to animal husbandry, but also poses a potential threat to human reproductive health, but its mechanism is still unclear. To address this question, multi-omics were performed on porcine Sertoli cells and mice testis. The data suggest that AFB1 induced testicular damage manifested as decreased expression of GJA1, ZO1 and OCCLUDIN in mice (p < 0.01) and inhibition of porcine Sertoli cell proliferation. Transcriptomic analysis suggested changes in noncoding RNA expression profiles that affect the cell cycle-related Ras/PI3K/Akt signaling pathway after AFB1 exposure both in mice and pigs. Specifically, AFB1 caused abnormal cell cycle of testis with the characterization of decreased expressions of CCNA1, CCNB1 and CDK1 (p < 0.01). Flow cytometry revealed that the G2/M phase was significantly increased after AFB1 exposure. Meanwhile, AFB1 downregulated the expressions of Ras, PI3K and AKT both in porcine Sertoli cell (p < 0.01) and mice testis (p < 0.01). Metabolome analysis verified the alterations in the PI3K/Akt signaling pathway (p < 0.05). Moreover, the joint analysis of metabolome and microbiome found that the changes of metabolites were correlated with the expression of flora. In conclusion, we have demonstrated that AFB1 impairs testicular development via the cell cycle-related Ras/PI3K/Akt signaling., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)

Published
2023
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46. Single cell epigenomic and transcriptomic analysis uncovers potential transcription factors regulating mitotic/meiotic switch.

Author

Zhang FL, Feng YQ, Wang JY, Zhu KX, Wang L, Yan JM, Li XX, Wang JJ, Ge W, De Felici M, and Shen W

Subjects
Female, Animals, Mice, Epigenomics, Meiosis genetics, Chromatin genetics, Transcription Factors genetics, Transcription Factors metabolism, Transcriptome genetics
Abstract

In order to reveal the complex mechanism governing the mitotic/meiotic switch in female germ cells at epigenomic and genomic levels, we examined the chromatin accessibility (scATAC-seq) and the transcriptional dynamics (scRNA-seq) in germ cells of mouse embryonic ovary between E11.5 to 13.5 at single-cell resolution. Adopting a strict transcription factors (TFs) screening framework that makes it easier to understand the single-cell chromatin signature and a TF interaction algorithm that integrates the transcript levels, chromatin accessibility, and motif scores, we identified 14 TFs potentially regulating the mitotic/meiotic switch, including TCFL5, E2F1, E2F2, E2F6, E2F8, BATF3, SP1, FOS, FOXN3, VEZF1, GBX2, CEBPG, JUND, and TFDP1. Focusing on TCFL5, we constructed Tcfl5 +/- mice which showed significantly reduced fertility and found that decreasing TCFL5 expression in cultured E12.5 ovaries by RNAi impaired meiotic progression from leptotene to zygotene. Bioinformatics analysis of published results of the embryonic germ cell transcriptome and the finding that in these cells central meiotic genes (Stra8, Tcfl5, Sycp3, and E2f2) possess open chromatin status already at the mitotic stage together with other features of TCFL5 (potential capability to interact with core TFs and activate meiotic genes, its progressive activation after preleptotene, binding sites in the promoter region of E2f2 and Sycp3), indicated extensive amplification of transcriptional programs associated to mitotic/meiotic switch with an important contribution of TCFL5. We conclude that the identified TFs, are involved in various stages of the mitotic/meiotic switch in female germ cells, TCFL5 primarily in meiotic progression. Further investigation on these factors might give a significant contribution to unravel the molecular mechanisms of this fundamental process of oogenesis and provide clues about pathologies in women such as primary ovarian insufficiency (POI) due at least in part to meiotic defects., (© 2023. The Author(s).)

Published
2023
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47. Murine skin-derived multipotent papillary dermal fibroblast progenitors show germline potential in vitro.

Author

Ge W, Sun YC, Qiao T, Liu HX, He TR, Wang JJ, Chen CL, Cheng SF, Dyce PW, De Felici M, and Shen W

Subjects
Animals, Mice, Cell Differentiation, Multipotent Stem Cells, Cells, Cultured, Fibroblasts, Germ Cells metabolism, Hematopoietic Stem Cells
Abstract

Background: Many laboratories have described the in vitro isolation of multipotent cells with stem cell properties from the skin of various species termed skin-derived stem cells (SDSCs). However, the cellular origin of these cells and their capability to give rise, among various cell types, to male germ cells, remain largely unexplored., Methods: SDSCs were isolated from newborn mice skin, and then differentiated into primordial germ cell-like cells (PGCLCs) in vitro. Single-cell RNA sequencing (scRNA-seq) was then applied to dissect the cellular origin of SDSCs using cells isolated from newborn mouse skin and SDSC colonies. Based on an optimized culture strategy, we successfully generated spermatogonial stem cell-like cells (SSCLCs) in vitro., Results: Here, using scRNA-seq and analyzing the profile of 7543 single-cell transcriptomes from newborn mouse skin and SDSCs, we discovered that they mainly consist of multipotent papillary dermal fibroblast progenitors (pDFPs) residing in the dermal layer. Moreover, we found that epidermal growth factor (EGF) signaling is pivotal for the capability of these progenitors to proliferate and form large colonies in vitro. Finally, we optimized the protocol to efficiently generate PGCLCs from SDSCs. Furthermore, PGCLCs were induced into SSCLCs and these SSCLCs showed meiotic potential when cultured with testicular organoids., Conclusions: Our findings here identify pDFPs as SDSCs derived from newborn skin and show for the first time that such precursors can be induced to generate cells of the male germline., (© 2023. The Author(s).)

Published
2023
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48. H3K4me3 as a target of di(2-ethylhexyl) phthalate (DEHP) impairing primordial follicle assembly.

Author

Li MH, Wang JJ, Feng YQ, Liu X, Yan ZH, Zhang XJ, Wen YX, Luo HW, Li L, De Felici M, Zhao AH, and Shen W

Subjects
Animals, Female, Male, Mice, Histone-Lysine N-Methyltransferase, Histones, Ovarian Follicle, Diethylhexyl Phthalate toxicity, Endocrine Disruptors toxicity
Abstract

Di (2-ethylhexyl) phthalate (DEHP) is a widely used plastics additive that growing evidence indicates as endocrine disruptor able to negatively affect various reproductive processes both in female and male animals, including humans. However, the precise molecular mechanism of such actions is not completely understood. In the present study, scRNA-seq was performed on the ovaries of offspring from mothers exposed to DEHP from 16.5 days post coitum to 3 days post-partum, when the primordial follicle (PF) stockpile is established. While the histological observations of the offspring ovaries from DEHP exposed mothers confirmed previous data about a distinct reduction of oocytes enclosed in PFs. Focusing on oocytes, scRNA-seq analyses showed that the genes that mostly changed by DEHP were enriched GO terms related to histone H3-K4 methylation. Moreover, we observed H3K4me3 level, an epigenetics modification of H3 that is crucial for chromatin transcription, decreased by 40.28% (P < 0.01) in DEHP-treated group compared with control. When the newborn ovaries were cultured in vitro, the DEHP effects were abolished by tamoxifen (an estrogen receptor antagonist) or overexpression of Smyd3 (one specific methyltransferase of H3K4me3), in particular, the percentage of oocyte enclosed in PF was increased by 15.39% in DEHP plus Smyd3 overexpression group than of DEHP group (P < 0.01), which was accompanied by the upregulation of H3K4me3. Collectively, the present results discover Smyd3-H3K4me3 as a novel target of the deleterious ER-mediated effect of DEHP on PF formation during early folliculogenesis in the mouse and highlight epigenetics changes as prominent targets of endocrine disruptors like DEHP., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Published
2023
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49. Multi-omics analysis reveals that iron deficiency impairs spermatogenesis by gut-hormone synthesis axis.

Author

Zhang FL, Yuan S, Dong PY, Ma HH, De Felici M, Shen W, and Zhang XF

Subjects
Male, Mice, Animals, Spermatogenesis, Metabolomics, Iron, Hormones, Iron Deficiencies
Abstract

Considering that research has mainly focussed on how excessive iron supplementation leads to reproductive cytotoxicity, there is a lack of in-depth research on reproductive system disorders caused by iron deficiency. To gain a better understanding of the effects of iron deficiency on the reproductive system, especially spermatogenesis, we first constructed a mouse model of iron deficiency. We employed multi-omic analysis, including transcriptomics, metabolomics, and microbiomics, to comprehensively dissect the impact of iron deficiency on spermatogenesis. Moreover, we verified our findings in detail using western blot, immunofluorescence, immunohistochemistry, qRT-PCR and other techniques. Microbiomic analysis revealed altered gut microbiota in iron-deficient mice, and functional predictive analysis showed that gut microbiota can regulate spermatogenesis. The transcriptomic data indicated that iron deficiency directly alters expression of meiosis-related genes. Transcriptome data also revealed that iron deficiency indirectly regulates spermatogenesis by affecting hormone synthesis, findings confirmed by metabolomic data, western blot and immunofluorescence. Interestingly, competing endogenous RNA networks also play a vital role in regulating spermatogenesis after iron deficiency. Taken together, the data elucidate that iron deficiency impairs spermatogenesis and increases the risk of male infertility by affecting hormone synthesis and promoting gut microbiota imbalance., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)

Published
2022
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