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1. Ovarian cancer and smoking: individual participant meta-analysis including 28,114 women with ovarian cancer from 51 epidemiological studies

Author

Gaitskell, K, Hermon, C, Moser, K, Reeves, G, Peto, R, Brinton, L, Marchbanks, P, Negri, E, Ness, R, Peeters, PHM, Vessey, M, Calle, EE, Gapstur, SM, Patel, AV, Dal Maso, L, Talamini, R, Chetrit, A, Hirsh-Yechezkel, G, Lubin, F, Sadetzki, S, Banks, E, Beral, V, Bull, D, Callaghan, K, Crossley, B, Goodill, A, Green, J, Key, T, Sitas, F, Collins, R, Doll, R, Gonzalez, A, Lee, N, Ory, HW, Peterson, HB, Wingo, PA, Martin, N, Pardthaisong, T, Silpisornkosol, S, Theetranont, C, Boosiri, B, Chutivongse, S, Jimakorn, P, Virutamasen, P, Wongsrichanalai, C, Tjonneland, A, Titus-Ernstoff, L, Byers, T, Rohan, T, Mosgaard, BJ, Yeates, D, Freudenheim, JL, Chang-Claude, J, Kaaks, R, Anderson, KE, Folsom, A, Robien, K, Hampton, J, Newcomb, PA, Rossing, MA, Thomas, DB, Weiss, NS, Riboli, E, Clavel-Chapelon, F, Cramer, D, Hankinson, SE, Tworoger, SS, Franceschi, S, La Vecchia, C, Adami, HO, Magnusson, C, Riman, T, Weiderpass, Elisabete, Wolk, A, Schouten, LJ, van den Brandt, PA, Chantarakul, N, Koetsawang, S, Rachawat, D, Palli, D, Black, A, Brinton, LA, Freedman, DM, Hartge, P, Hsing, AW, Lacey, JV, Hoover, RN, Schairer, C, Urban, M, Graff-Iversen, Sidsel, Selmer, Randi, Bain, CJ, Green, AC, Purdie, DM, Siskind, V, Webb, PM, Moysich, K, McCann, SE, Hannaford, P, Kay, C, Binns, CW, Lee, AH, Zhang, M, Ness, RB, Nasca, P, Coogan, PF, Palmer, JR, Rosenberg, L, Kelsey, J, Paffenbarger, R, Whittemore, A, Katsouyanni, K, Trichopoulou, A, Trichopoulos, D, Tzonou, A, Dabancens, A, Martinez, L, Molina, R, Salas, O, Goodman, MT, Lurie, G, Carney, ME, Wilkens, LR, Hartman, L, Manjer, J, Olsson, H, Grisso, JA, Morgan, M, Wheeler, JE, Bunker, CH, Edwards, RP, Modugno, F, Casagrande, J, Pike, MC, Ross, RK, Wu, AH, Miller, AB, Kumle, Merethe, Gram, Inger Torhild, Lund, Eiliv, McGowan, L, Shu, XO, Zheng, W, Farley, TMM, Holck, S, Meirik, O, Risch, HA, E. E. Calle, S. M. Gapstur, A. V. Patel, L. Dal Maso, R. Talamini, A. Chetrit, G. Hirsh Yechezkel, F. Lubin, S. Sadetzki, E. Bank, V. Beral, D. Bull, K. Callaghan, B. Crossley, K. Gaitskell, A. Goodill, J. Green, C. Hermon, T. Key, K. Moser, G. Reeve, F. Sita, R. Collin, R. Doll, R. Peto, C. A. Gonzalez, N. Lee, P. Marchbank, H. W. Ory, H. B. Peterson, P. A. Wingo, N. Martin, T. Pardthaisong, S. Silpisornkosol, C. Theetranont, B. Boosiri, S. Chutivongse, P. Jimakorn, P. Virutamasen, C. Wongsrichanalai, A. Tjonneland, L. Titus Ernstoff, T. Byer, T. Rohan, B. J. Mosgaard, M. Vessey, D. Yeate, J. L. Freudenheim, J. Chang Claude, R. Kaak, K. E. Anderson, A. Folsom, K. Robien, J. Hampton, P. A. Newcomb, M. A. Rossing, D. B. Thoma, N. S. Wei, E. Riboli, F. Clavel Chapelon, D. Cramer, S. E. Hankinson, S. S. Tworoger, S. Franceschi, C. La Vecchia, E. Negri, H. O. Adami, C. Magnusson, T. Riman, E. Weiderpa, A. Wolk, L. J. Schouten, P. A. van den Brandt, N. Chantarakul, S. Koetsawang, D. Rachawat, D. Palli, A. Black, L. A. Brinton, D. M. Freedman, P. Hartge, A. W. Hsing, J. Lacey, R. N. Hoover, C. Schairer, M. Urban, S. Graff Iversen, R. Selmer, C. J. Bain, A. C. Green, D. M. Purdie, V. Siskind, P. M. Webb, K. Moysich, S. E. Mccann, P. Hannaford, C. Kay, C. W. Binn, A. H. Lee, M. Zhang, R. B. Ne, P. Nasca, P. F. Coogan, J. R. Palmer, L. Rosenberg, J. Kelsey, R. Paffenbarger, A. Whittemore, K. Katsouyanni, A. Trichopoulou, D. Trichopoulo, A. Tzonou, A. Dabancen, L. Martinez, R. Molina, O. Sala, M. T. Goodman, G. Lurie, M. E. Carney, L. R. Wilken, L. Hartman, J. Manjer, H. Olsson, J. A. Grisso, M. Morgan, J. E. Wheeler, C. H. Bunker, R. P. Edward, F. Modugno, P. H. M. Peeter, J. Casagrande, M. C. Pike, R. K. Ro, A. H. Wu, A. B. Miller, M. Kumle, I. T. Gram, E. Lund, L. Mcgowan, X. O. Shu, W. Zheng, T. M. M. Farley, S. Holck, O. Meirik, H. A. Risch, Epidemiologie, RS: CAPHRI School for Public Health and Primary Care, and RS: GROW - School for Oncology and Reproduction

Subjects
hormonal factor, Oncology, body-mass index, Comorbidity, anthropometric measurement, Body Mass Index, 0302 clinical medicine, Epidemiology, Cancer Type - Ovarian Cancer, 030212 general & internal medicine, epithelial ovarian, Prospective cohort study, oral contraceptives, Ovarian Neoplasms, Incidence (epidemiology), Incidence, Smoking, Articles, Middle Aged, Adenocarcinoma, Mucinous, 3. Good health, Causality, Europe, risk-factor, Serous fluid, 030220 oncology & carcinogenesis, Meta-analysis, Adenocarcinoma, Female, Risk, Adult, medicine.medical_specialty, prospective cohort, Etiology - Exogenous Factors in the Origin and Cause of Cancer, Risk Assessment, methods, 03 medical and health sciences, Internal medicine, oral-contraceptive use, medicine, cancer, Humans, Women, tobacco smoking, therapy, cigarette-smoking, VDP::Medical disciplines: 700::Clinical medical disciplines: 750::Oncology: 762, business.industry, Research, medicine.disease, VDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Onkologi: 762, Relative risk, North America, Other, United-State, business, Ovarian cancer, Meta-Analysis
Abstract

BACKGROUND: Smoking has been linked to mucinous ovarian cancer, but its effects on other ovarian cancer subtypes and on overall ovarian cancer risk are unclear, and the findings from most studies with relevant data are unpublished. To assess these associations, we review the published and unpublished evidence. METHODS: Eligible epidemiological studies were identified by electronic searches, review articles, and discussions with colleagues. Individual participant data for 28,114 women with and 94,942 without ovarian cancer from 51 epidemiological studies were analysed centrally, yielding adjusted relative risks (RRs) of ovarian cancer in smokers compared with never smokers. FINDINGS: After exclusion of studies with hospital controls, in which smoking could have affected recruitment, overall ovarian cancer incidence was only slightly increased in current smokers compared with women who had never smoked (RR 1·06, 95% CI 1·01-1·11, p=0·01). Of 17,641 epithelial cancers with specified histology, 2314 (13%) were mucinous, 2360 (13%) endometrioid, 969 (5%) clear-cell, and 9086 (52%) serous. Smoking-related risks varied substantially across these subtypes (p(heterogeneity)

Published
2016

2. Menopausal hormone use and ovarian cancer risk : individual participant meta-analysis of 52 epidemiological studies

Author

Gapstur, S. M., Patel, A. V., Banks, E., Dal Maso, L., Talamini, R., Chetrit, A., Hirsh-Yechezkel, G., Lubin, F., Sadetzki, S., Beral, V., Bull, D., Cairns, B., Crossley, B., Gaitskell, K., Goodill, A., Green, J., Hermon, C., Key, T., Moser, K., Reeves, G., Sitas, F., Collins, R., Peto, R., Gonzalez, C. A., Lee, N., Marchbanks, P., Ory, H. W., Peterson, H. B., Wingo, P. A., Martin, N., Silpisornkosol, S., Theetranont, C., Boosiri, B., Chutivongse, S., Jimakorn, P., Virutamasen, P., Wongsrichanalai, C., Goodman, M. T., Lidegaard, O., Kjaer, S. K., Morch, L. S., Tjonneland, A., Byers, T., Rohan, T., Mosgaard, B., Vessey, M., Yeates, D., Onland-Moret, N. C., Peeters, P. H. M., and Collaborative Grp Epidemiological

Subjects
WOMEN, HEALTH, THERAPY
Abstract

Background Half the epidemiological studies with information about menopausal hormone therapy and ovarian cancer risk remain unpublished, and some retrospective studies could have been biased by selective participation or recall. We aimed to assess with minimal bias the effects of hormone therapy on ovarian cancer risk. Methods Individual participant datasets from 52 epidemiological studies were analysed centrally. The principal analyses involved the prospective studies (with last hormone therapy use extrapolated forwards for up to 4 years). Sensitivity analyses included the retrospective studies. Adjusted Poisson regressions yielded relative risks (RRs) versus never-use. Findings During prospective follow-up, 12 110 postmenopausal women, 55% (6601) of whom had used hormone therapy, developed ovarian cancer. Among women last recorded as current users, risk was increased even with Interpretation The increased risk may well be largely or wholly causal; if it is, women who use hormone therapy for 5 years from around age 50 years have about one extra ovarian cancer per 1000 users and, if its prognosis is typical, about one extra ovarian cancer death per 1700 users.

Published
2015

3. Menopausal hormone use and ovarian cancer risk: individual participant meta-analysis of 52 epidemiological studies

Author

Gapstur, S. M. Patel, A. V. Banks, E. Dal Maso, L. and Talamini, R. Chetrit, A. Hirsh-Yechezkel, G. Lubin, F. and Sadetzki, S. Beral, V. Bull, D. Cairns, B. Crossley, B. and Gaitskell, K. Goodill, A. Green, J. Hermon, C. Key, T. Moser, K. Reeves, G. Sitas, F. Collins, R. Peto, R. Gonzalez, C. A. Lee, N. Marchbanks, P. Ory, H. W. and Peterson, H. B. Wingo, P. A. Martin, N. Silpisornkosol, S. and Theetranont, C. Boosiri, B. Chutivongse, S. Jimakorn, P. and Virutamasen, P. Wongsrichanalai, C. Goodman, M. T. and Lidegaard, O. Kjaer, S. K. Morch, L. S. Tjonneland, A. and Byers, T. Rohan, T. Mosgaard, B. Vessey, M. Yeates, D. and Freudenheim, J. L. Titus, L. J. Chang-Claude, J. Kaaks, R. Anderson, K. E. Lazovich, D. Robien, K. Hampton, J. and Newcomb, P. A. Rossing, M. A. Thomas, D. B. Weiss, N. S. and Lokkegaard, E. Riboli, E. Clavel-Chapelon, F. Cramer, D. and Hankinson, S. E. Tamimi, R. M. Tworoger, S. S. and Franceschi, S. La Vecchia, C. Negri, E. Adami, H. O. and Magnusson, C. Riman, T. Weiderpass, E. Wolk, A. and Schouten, L. J. van den Brandt, P. A. Chantarakul, N. and Koetsawang, S. Rachawat, D. Palli, D. Black, A. Brinton, L. A. Freedman, D. M. Hartge, P. Hsing, A. W. Jnr, J. V. Lacey Lissowska, J. Hoover, R. N. Schairer, C. Babb, C. and Urban, M. Graff-Iversen, S. Selmer, R. Bain, C. J. and Green, A. C. Purdie, D. M. Siskind, V. Webb, P. M. and Moysich, K. McCann, S. E. Hannaford, P. Kay, C. Binns, C. W. Lee, A. H. Zhang, M. Ness, R. B. Nasca, P. and Coogan, P. F. Palmer, J. R. Rosenberg, L. Whittemore, A. and Katsouyanni, K. Trichopoulou, A. Trichopoulos, D. Tzonou, A. and Dabancens, A. Martinez, L. Molina, R. Salas, O. and Lurie, G. Carney, M. E. Wilkens, L. R. Hartman, L. and Manjer, J. Olsson, H. Kumle, M. Grisso, J. A. Morgan, M. and Wheeler, J. E. Edwards, R. P. Kelley, J. L. Modugno, F. and Onland-Moret, N. C. Peeters, P. H. M. Casagrande, J. and Pike, M. C. Wu, A. H. Canfell, K. Miller, A. B. Gram, I. T. Lund, E. McGowan, L. Shu, X. O. Zheng, W. Farley, T. M. M. Holck, S. Meirik, O. Risch, H. A. Collaborative Grp Epidemiological

Abstract

Background Half the epidemiological studies with information about menopausal hormone therapy and ovarian cancer risk remain unpublished, and some retrospective studies could have been biased by selective participation or recall. We aimed to assess with minimal bias the effects of hormone therapy on ovarian cancer risk. Methods Individual participant datasets from 52 epidemiological studies were analysed centrally. The principal analyses involved the prospective studies (with last hormone therapy use extrapolated forwards for up to 4 years). Sensitivity analyses included the retrospective studies. Adjusted Poisson regressions yielded relative risks (RRs) versus never-use. Findings During prospective follow-up, 12 110 postmenopausal women, 55% (6601) of whom had used hormone therapy, developed ovarian cancer. Among women last recorded as current users, risk was increased even with

Published
2015

4. Menopausal hormone use and ovarian cancer risk: individual participant meta-analysis of 52 epidemiological studies

Author

Epi Kanker Team 1, JC onderzoeksprogramma Kanker, Cancer, Cardiovasculaire Epi Team 3, Circulatory Health, JC onderzoeksprogramma Cardiovasculaire Epidemiologie, Gapstur, S. M., Patel, A. V., Banks, E., Dal Maso, L., Talamini, R., Chetrit, A., Hirsh-Yechezkel, G., Lubin, F., Sadetzki, S., Beral, V., Bull, D., Cairns, B., Crossley, B., Gaitskell, K., Goodill, A., Green, J., Hermon, C., Key, T., Moser, K., Reeves, G., Sitas, F., Collins, R., Peto, R., Gonzalez, C. A., Lee, N., Marchbanks, P., Ory, H. W., Peterson, H. B., Wingo, P. A., Martin, N., Silpisornkosol, S., Theetranont, C., Boosiri, B., Chutivongse, S., Jimakorn, P., Virutamasen, P., Wongsrichanalai, C., Goodman, M. T., Lidegaard, O., Kjaer, S. K., Morch, L. S., Tjonneland, A., Byers, T., Rohan, T., Mosgaard, B., Vessey, M., Yeates, D., Onland-Moret, N. C., Peeters, P. H. M., Collaborative Grp Epidemiological, Epi Kanker Team 1, JC onderzoeksprogramma Kanker, Cancer, Cardiovasculaire Epi Team 3, Circulatory Health, JC onderzoeksprogramma Cardiovasculaire Epidemiologie, Gapstur, S. M., Patel, A. V., Banks, E., Dal Maso, L., Talamini, R., Chetrit, A., Hirsh-Yechezkel, G., Lubin, F., Sadetzki, S., Beral, V., Bull, D., Cairns, B., Crossley, B., Gaitskell, K., Goodill, A., Green, J., Hermon, C., Key, T., Moser, K., Reeves, G., Sitas, F., Collins, R., Peto, R., Gonzalez, C. A., Lee, N., Marchbanks, P., Ory, H. W., Peterson, H. B., Wingo, P. A., Martin, N., Silpisornkosol, S., Theetranont, C., Boosiri, B., Chutivongse, S., Jimakorn, P., Virutamasen, P., Wongsrichanalai, C., Goodman, M. T., Lidegaard, O., Kjaer, S. K., Morch, L. S., Tjonneland, A., Byers, T., Rohan, T., Mosgaard, B., Vessey, M., Yeates, D., Onland-Moret, N. C., Peeters, P. H. M., and Collaborative Grp Epidemiological

Published
2015

5. Transgene-free human induced pluripotent stem cell line (HS5-SV.hiPS) generated from cesarean scar-derived fibroblasts.

Author

Rungsiwiwut, Ruttachuk, Pavarajarn, Wipawee, Numchaisrika, Pranee, Virutamasen, Pramuan, and Pruksananonda, Kamthorn

Abstract

Transgene-free human HS5-SV.hiPS line was generated from human cesarean scar-derived fibroblasts using temperature-sensitive Sendai virus vectors carrying Oct4, Sox2, cMyc and Klf4 exogenous transcriptional factors. The viral constructs were eliminated from HS5-SV.hiPS line through heat treatment. Transgene-free HS5-SV.hiPS cells expressed pluripotent associated transcription factors Oct4, Nanog, Sox2, Rex1 and surface markers SSEA-4, TRA-1-60 and OCT4. HS5-SV.hiPS cells formed embryoid bodies and differentiated into three embryonic germ layers in vivo. HS5-SV.hiPS cells maintained their normal karyotype (46, XX) after culture for extended period. HS5-SV.hiPS displayed the similar pattern of DNA fingerprinting to the parenteral scar-derived fibroblasts. [ABSTRACT FROM AUTHOR]

Published
2016
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6. Competency Assessment for Branding Programs Development in Thailand's Higher Education

Author

Porngarm, Virutamasen, Kageeporn, Wongpreedee, Koraklod, Kumsook, and Pansiri, Phansuwan-Pujito

Abstract

The ever-changing business environment resulting from changing consumer behaviors, fierce competition and advances in technology affect the strategic positioning of a brand. Maintaining healthy brands or embarking on a rebranding or repositioning strategy calls for a more creative set of branding management competencies in order to respond to the marketing challenges of the 21st century. This research paper attempts to assess brand management competences, attitudes and knowledge important in current business environment, to further accurately design branding-related curricula that truly reflect needs in the contemporary business and professional environment. Using a qualitative research approach, the data was collected from focus group interviews and questionnaires with seventeen management people from the private sector. The results identify the top-rated knowledge and/or competencies needed in branding a business, which are competence in research development, knowledge of brand strategic planning, ability to communicate added value in a clear way, knowledge of brand identity development, and ability to manage and keep the brand management process ‘alive’, respectively. The paper concludes with a discussion of the underlying key implications for both academia and business.

Published
2016
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7. Tourist Perceptions to Cultural Identity: The Case of Thai Experience

Author

Kongprasert, Nattapong and Virutamasen, Porngarm

Abstract

Tourism is seen as one of the main drivers of socio-economic progress in both developed and developing regions. Many developing countries perceive tourism as a fast track to economic growth. Thailand tourism's industry contributes significantly to the Thai economy, which receives around 7% of its GDP from international tourism revenue. Thailand is often viewed as a wondrous kingdom, featuring temples, wildlife and tropical islands. Visitors are also attracted by its history, culture, modern capital city and reputation as the “land of smiles”. Entrepreneurs in Thailand try to capitalize on these characteristics to create products or services to serve tourists. However, good design and good quality are not enough to survive in a competitive market. The make up of customers is constantly evolving and they are becoming more discerning and demanding. Thus, it is important to work closely with customers to make sure that products and services fulfill their needs and requirements, and to understand customers through study of their behaviors and preferences. This study explored customer perceptions of Thai cultural identity, and employed an emotional design approach to find out how products may fulfill customer perceptions and requirements. Data was collected by means of a questionnaire then statistically analyzed using the principal component analysis (PCA) approach. Results illustrate the relationship between customer perception and Thai cultural identity, and can be used to guide entrepreneur decision making to create new products or services following the Thai cultural identity and meeting of perceptions of customers.

Published
2015
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8. Strengthen Brand Association through SE: Institutional Theory Revisited

Author

Virutamasen, Porngarm, Wongpreedee, Kageeporn, and Kumnungwut, Weeranan

Abstract

Brand association includes connecting images and symbols with a specific brand or its benefits. Brand marketers attempt to initiate new strategies to strengthen brand association in order to respond effectively to the ever-changing business environment. In today's business context, it has been claimed that business philosophy has shifted from being predominantly orientated towards long-term growth and shareholder profit to broader goals based on the triple bottom line of economic, social and environmental protection and enhancement. Consequently, organizations seeking to survive in this dynamic environment should include social benefits in their business operations. By drawing upon institutional theory and examining the key dimensions of brand equity, we show that business social enterprise is not just emerging but becoming a normative pressure on organizations. Thus, we propose that organizations conforming to this new form of business model as a so-called social enterprise (SE) can strengthen their brand association, leading to further gains in legitimacy in the field. We derived two formal hypotheses from this conceptual framework and expect that conforming to social enterprise businesses would increase brand association performance from the institutional theory perspective as proposed. We hope that this research paper contributes to the branding as well as social enterprise literature by providing a comprehensive framework and discussing relevant issues in explaining key variables. We conclude the paper with specified implications for future research and management practice.

Published
2015
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9. Entrepreneurial Mindsets for Innovative Brand Development: Case Studies in Jewellery Education

Author

Wongpreedee, Kageeporn, Kiratisin, Amonmat, and Virutamasen, Porngarm

Abstract

Since 1992, there has been development of a triple helix of university-industry-government in the jewellery industry to produce middle management for original equipment manufacturing (OEM), which is mostly typical in Thai industry. To promote the export market, jewellery manufacturers needed to develop added-value products along the lines of an original brand manufacturing (OBM) model. Thai government policy has been to promote research and innovation in universities for transfer to industry and subsequent development of innovative products and brand image. Hence, new materials and innovative technologies needed to be delivered to the Thai jewellery industry. However, there were struggles with OEM to develop a brand image among the mindsets of workers. Therefore, the innovation-branding development concept was introduced in small- to medium-sized enterprises. University business incubators were introduced as a scientific classroom-based activity of material science program focusing on gems and jewellery to develop interpersonal skills and entrepreneurial mindsets. This paper reports on the development of entrepreneurial mindsets in this environment and the diffusion of marketing and technological concepts in the industry. A dummy company was established, and it selected innovations from universities for students to role-play brand manufacturers, selling products in international trading fairs. These activities began in 2009 and the careers of the key persons involved have been followed. Data was collected on the success of their careers as entrepreneurs after graduation. The results show that they are eager and persistent to do the business and develop their own brand right after graduation. Some characteristics such as engagement, social responsibilities, participative behaviour and honesty in business were displayed.

Published
2015
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10. Mesenchymal stem cells for restoring endometrial function: An infertility perspective.

Author

Rungsiwiwut R, Virutamasen P, and Pruksananonda K

Abstract

Background: Mesenchymal stem cells (MSCs) can be derived from several tissues such as bone marrow, placenta, adipose tissue, or endometrial tissue. MSCs gain a lot of attention for cell-based therapy due to their characteristics including differentiation ability and immunomodulatory effect. Preclinical and clinical studies demonstrated that MSCs can be applied to treat female infertility by improving of the functions of ovary and uterus. This mini- review focuses on the current study of treatment of endometrial infertility by using MSCs., Methods: The present study performed a literature review focusing on the effect of MSCs for treatment of women infertility caused by endometrial dysfunction., Results: Bone marrow-, umbilical cord-, adipose-, amniotic-, and menstruation-derived MSCs enhance endometrial cell proliferation, injury repairs as well as reducing scar formation. The beneficial mechanism probably via immunomodulatory, cell differentiation, stimulates endometrial cell proliferation and down-regulation of fibrosis genes. The major advantage of using MSCs is to improve endometrial functions resulting in increased implantation and pregnancy., Conclusions: MSCs exhibit a potential for endometrial infertility treatment. Adipose- and menstruation-derived stem cells show advantages over other sources because the cells can be derived easily and do not causes graft rejection after autologous transplantation., Competing Interests: There are no conflicts of interest to declare., (© 2020 The Authors. Reproductive Medicine and Biology published by John Wiley & Sons Australia, Ltd on behalf of Japan Society for Reproductive Medicine.)

Published
2020
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11. Human Caesarean scar-derived feeder cells: a novel feeder cell type for culturing human pluripotent stem cells without exogenous basic fibroblast growth factor supplementation.

Author

Pavarajarn W, Rungsiwiwut R, Numchaisrika P, Virutamasen P, and Pruksananonda K

Subjects
Cell Differentiation, Cell Line, Cicatrix etiology, Cicatrix pathology, Coculture Techniques, Feasibility Studies, Feeder Cells pathology, Female, Fibroblasts pathology, Gene Expression Regulation, Developmental, Humans, Karyotype, Phenotype, Pregnancy, Signal Transduction, Cesarean Section adverse effects, Cicatrix metabolism, Feeder Cells metabolism, Fibroblasts metabolism, Paracrine Communication, Pluripotent Stem Cells metabolism
Abstract

In a feeder-dependent culture system of human pluripotent stem cells (hPSCs), coculture with mouse embryonic fibroblasts may limit the clinical use of hPSCs. The aim of this study was to determine the feasibility of using human Caesarean scar fibroblasts (HSFs) as feeder cells for the culture of hPSCs. HSFs were isolated and characterised and cocultured with hPSCs, and the pluripotency, differentiation ability and karyotypic stability of hPSCs were determined. Inactivated HSFs expressed genes (including inhibin subunit beta A (INHBA), bone morphogenetic protein 4 (BMP4), fibroblast growth factor 2 (FGF2), transforming growth factor-β1 (TGFB1), collagen alpha-1(I) (COL1A1) and fibronectin-1 (FN1) that have been implicated in the maintenance of hPSC pluripotency. When HSFs were used as feeder cells, the pluripotency and karyotypic stability of hPSC lines did not change after prolonged coculture. Interestingly, exogenous FGF2 could be omitted from the culture medium when HSFs were used as feeder cells for hESCs but not hiPSCs. hESCs cocultured with HSF feeder cells in medium without FGF2 supplementation maintained their pluripotency (as confirmed by the expression of pluripotency markers and genes), differentiated invitro into embryonic germ layers and maintained their normal karyotype. The present study demonstrates that HSFs are a novel feeder cell type for culturing hPSCs and that supplementation of exogenous FGF2 is not necessary for the Chula2.hES line.

Published
2020
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12. Triploid human embryonic stem cells derived from tripronuclear zygotes displayed pluripotency and trophoblast differentiation ability similar to the diploid human embryonic stem cells.

Author

Rungsiwiwut R, Numchaisrika P, Ahnonkitpanit V, Virutamasen P, and Pruksananonda K

Subjects
Blastocyst cytology, Cell Differentiation, Cell Line, Cell Lineage, Chromosome Aberrations, Chromosomes ultrastructure, Coculture Techniques, DNA Fingerprinting, Diploidy, Embryo Culture Techniques, Fibroblasts metabolism, Germ Cells cytology, Humans, Karyotyping, Models, Theoretical, Human Embryonic Stem Cells cytology, Triploidy, Trophoblasts cytology, Zygote cytology
Abstract

Because the diploid human embryonic stem cells (hESCs) can be successfully derived from tripronuclear zygotes thus, they can serve as an alternative source of derivation of normal karyotype hESC lines. The aim of the present study was to compare the pluripotency and trophoblast differentiation ability of hESCs derived from tripronuclear zygotes and diploid hESCs. In the present study, a total of 20 tripronuclear zygotes were cultured; 8 zygotes developed to the blastocyst stage and 1 hESC line was generated. Unlike the previous studies, chromosomal correction of tripronuclear zygotes during derivation of hESCs did not occur. The established line carries 3 sets of chromosomes and showed a numerical aberration. Although the cell line displayed an abnormal chromosome number, it was found the cell line has been shown to be pluripotent with the ability to differentiate into 3 embryonic germ layers both in vitro and in vivo. The expression of X inactive specific transcript (XIST) in mid-passage (passage 42) of undifferentiated triploid hESCs was detected, indicating X chromosome inactivation of the cell line. Moreover, when this cell line was induced to differentiate toward the trophoblast lineage, morphological and functional trophoblast cells were observed, similar to the diploid hESC line.

Published
2016
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13. Human Umbilical Cord Blood-Derived Serum for Culturing the Supportive Feeder Cells of Human Pluripotent Stem Cell Lines.

Author

Rungsiwiwut R, Ingrungruanglert P, Numchaisrika P, Virutamasen P, Phermthai T, and Pruksananonda K

Abstract

Although human pluripotent stem cells (hPSCs) can proliferate robustly on the feeder-free culture system, genetic instability of hPSCs has been reported in such environment. Alternatively, feeder cells enable hPSCs to maintain their pluripotency. The feeder cells are usually grown in a culture medium containing fetal bovine serum (FBS) prior to coculture with hPSCs. The use of FBS might limit the clinical application of hPSCs. Recently, human cord blood-derived serum (hUCS) showed a positive effect on culture of mesenchymal stem cells. It is interesting to test whether hUCS can be used for culture of feeder cells of hPSCs. This study was aimed to replace FBS with hUCS for culturing the human foreskin fibroblasts (HFFs) prior to feeder cell preparation. The results showed that HFFs cultured in hUCS-containing medium (HFF-hUCS) displayed fibroblastic features, high proliferation rates, short population doubling times, and normal karyotypes after prolonged culture. Inactivated HFF-hUCS expressed important genes, including Activin A, FGF2, and TGFβ1, which have been implicated in the maintenance of hPSC pluripotency. Moreover, hPSC lines maintained pluripotency, differentiation capacities, and karyotypic stability after being cocultured for extended period with inactivated HFF-hUCS. Therefore, the results demonstrated the benefit of hUCS for hPSCs culture system.

Published
2016
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