19 results on '"Li, Fei"'
Search Results
2. Caspase-8 promotes NLRP1/NLRP3 inflammasome activation and IL-1β production in acute glaucoma
- Author
-
Chi, Wei, Li, Fei, Chen, Hongrui, Wang, Yandong, Zhu, Yingting, Yang, Xuejiao, Zhu, Jie, Wu, Frances, Ouyang, Hong, Ge, Jian, Weinre, Robert N., Zhang, Kang, and Zhuo, Yehong
- Published
- 2014
3. Increased Locomotor Activity and Non-Selective Attention and Impaired Learning Ability in SD Rats after Lentiviral Vector-Mediated RNA Interference of Homer 1a in the Brain
- Author
-
Lei Yang, Mei Guo, Min Zhang, Meiling Tong, Qin Hong, Xia Chi, Xiao-qin Pan, Rong-hua Chen, Xirong Guo, and Li Fei
- Subjects
medicine.medical_specialty ,Genetic Vectors ,behavior ,Motor Activity ,Pathogenesis ,Glutamatergic ,Homer Scaffolding Proteins ,RNA interference ,Internal medicine ,microRNA ,Medicine ,Attention deficit hyperactivity disorder ,ADHD ,Animals ,Humans ,Homer 1a ,Psychiatry ,Injections, Intraventricular ,Messenger RNA ,Behavior, Animal ,business.industry ,Methylphenidate ,lentiviral vector ,Lentivirus ,Brain ,General Medicine ,medicine.disease ,Rats ,Endocrinology ,Gene Expression Regulation ,Attention Deficit Disorder with Hyperactivity ,RNAi ,Excitatory postsynaptic potential ,RNA Interference ,business ,Carrier Proteins ,medicine.drug ,Research Paper - Abstract
Our previous studies found that Homer 1a, a scaffolding protein localized at the post-synaptic density (PSD) of glutamatergic excitatory synapses, is significantly down-regulated in the brain of spontaneous hypertensive rats (SHR), an animal model of attention deficit hyperactivity disorder (ADHD). Furthermore, a first-line treatment drug for ADHD, methylphenidate, can up-regulate the expression of Homer 1a. To investigate the possible role of Homer 1a in the etiology and pathogenesis of ADHD, a lentiviral vector containing miRNA specific for Homer 1a was constructed in this study. Intracerebroventricular injection of this vector into the brain of Sprague Dawley (SD) rats significantly decreased Homer 1a mRNA and protein expression levels. Compared to their negative controls, these rats displayed a range of abnormal behaviors, including increased locomotor activity and non-selective attention and impaired learning ability. Our results indicated that Homer 1a down-regulation results in deficits in control over behavioral output and learning similar to ADHD.
- Published
- 2012
4. A new method to induce myasthenia gravis models and the protective effect of soluble decay accelerating factors
- Author
-
G.H. Zhang, S.Y. Pan, Li-Fei Xing, and L H Sun
- Subjects
Protein subunit ,Protein Renaturation ,Enzyme-Linked Immunosorbent Assay ,Western blot ,Genetics ,medicine ,Animals ,Humans ,Molecular Biology ,Polyacrylamide gel electrophoresis ,Decay-accelerating factor ,Acetylcholine receptor ,Messenger RNA ,medicine.diagnostic_test ,CD55 Antigens ,Chemistry ,Antibody titer ,General Medicine ,medicine.disease ,Molecular biology ,Hemolysis ,Recombinant Proteins ,Myasthenia Gravis, Autoimmune, Experimental ,Protein Structure, Tertiary ,Disease Models, Animal ,Neuroprotective Agents ,Solubility ,Rats, Inbred Lew ,Injections, Intravenous ,Electrophoresis, Polyacrylamide Gel ,Female - Abstract
It is expensive to induce experimental autoimmune myasthenia gravis (EAMG) by active immunity, and difficult to obtain natural acetylcholine receptor (AChR). We sought a new method of inducing EAMG by immunizing rats with artificially synthesized AChR. The AChR mRNA in TE671 cells was extracted and reverse transcribed. The inclusion body was purified and protein concentration was determined, and the EAMG animal model was used for induction. The serum was extracted from rat blood. The antibody titer was determined using enzyme-linked immunosorbant assay (ELISA). The concentration of decay accelerating factor (DAF) in the rat serum was determined by ELISA, and the metabolism of serum rDAF was determined by western blot. We evaluated the inhibition of rDAF by determining the 50% complement hemolysis unit in the rat serum. The extracellular domain (ECD) nucleotide sequence clone produced by polymerase chain reaction was completely consistent with that in the human gene bank; it was induced by isopropyl β-D-1-thiogalactopyranoside to express the protein after insertion into vector pET16b. Sodium dodecyl sulfate polyacrylamide gel electrophoresis demonstrated that the inclusion body protein was the exact target. The ECD protein was able to bind with mAb35 after dialysis and renaturation, which demonstrated protein activity. The soluble ECD protein was used to immunize rats and obtain the EAMG models. The inhibitory effect of the complement was unsatisfactory owing to high decay rate after rDAF injection into the EAMG models. It is easy to induce the EAMG model by obtaining the AChRTEα1 subunit ECD protein using the substitution method.
- Published
- 2015
5. Expression and regulation of high mobility group AT-hook 1 (HMGA1) during ovulation and luteinisation in rat ovary.
- Author
-
Li, Hao-ran, Li, Yan, Liu, Yu, Yu, Jiao-jiao, and Li, Fei-xue
- Subjects
GENE expression ,OVULATION ,TRANSCRIPTION factors ,MESSENGER RNA ,CELL differentiation - Abstract
High mobility group AT-hook 1 (HMGA1) is able to regulate gene expression and function as a tumour suppressor. The spatiotemporal expression pattern of HMGA1 was investigated in this study. Immature female rats (22–23 days old) were treated with 10 IU, s.c., pregnant mare's serum gonadotrophin to stimulate follicular development, followed 48 h later by injection with 5 IU, s.c., human chorionic gonadotrophin (hCG). Whole ovaries or granulosa cells were collected at various times after hCG administration (n = 3 per time point). Real-time polymerase chain reaction and western blot analysis revealed that HMGA1 was highly stimulated in the ovary by 4–12 h after hCG treatment. In situ hybridisation analysis demonstrated that Hmga1 mRNA expression was induced in granulosa cells between 8 and 12 h after hCG treatment. There was negligible Hmga1 mRNA signal observed in newly forming corpora lutea. In addition, the data indicated that both the protein kinase (PK) A and PKC pathways regulated Hmga1 expression in rat granulosa cells. In rat granulosa cell cultures, upregulation of Hmga1 was dependent on new protein synthesis because Hmga1 was inhibited by cycloheximide. Furthermore, Hmga1 mRNA expression in rat granulosa cell cultures was inhibited by AG1478, whereas NS398 and RU486 had no effect, suggesting that Hmga1 expression was regulated, in part, by the epidermal growth factor pathway. In summary, the findings of this study suggest that induction of Hmga1 may be important for theca and granulosa cell differentiation into luteal cells. Transcription factors are essential mediators of ovulation and luteinisation. The present study demonstrates that there are significantly increase in levels of the transcription factor high mobility group AT-hook 1 (HMGA1) after administration of human chorionic gonadotropin to rats. Induction of Hmga1 mRNA is mediated through both the protein kinase (PK) A and PKC signalling pathways by activation of the epidermal growth factor receptor and requires the synthesis of a new protein(s). Temporal stimulation of HMGA1 may be important for theca and granulosa cell differentiation into luteal cells. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
6. Resveratrol Inhibits the TGF-β1-Induced Proliferation of Cardiac Fibroblasts and Collagen Secretion by Downregulating miR-17 in Rat.
- Author
-
Zhang, Yao, Lu, Yuan, Ong'achwa, Machuki Jeremiah, Ge, Liqi, Qian, Yun, Chen, Lei, Hu, Xiaoqin, Li, Fei, Wei, Hui, Zhang, Chaoqun, Li, Chengzong, and Wang, Zhirong
- Subjects
CELL proliferation ,ANIMAL experimentation ,CARRIER proteins ,COLLAGEN ,FIBROBLASTS ,GENE expression ,MESSENGER RNA ,CARDIOMYOPATHIES ,POLYMERASE chain reaction ,RATS ,TRANSFORMING growth factors-beta ,FIBROSIS ,RESVERATROL ,MICRORNA - Abstract
Myocardial fibrosis (MF) can cause heart remodeling and it is an independent risk factor for malignant arrhythmias, sudden cardiac death, and other malignant cardiovascular events. It is often characterized by myocardial interstitial collagen deposition and hyperproliferation of cardiac fibroblasts (CFs). The transforming growth factor-β1 (TGF-β1) is the most influential profibrogenic factor. Resveratrol (RSV) is an active polyphenol substance that inhibits myocardial fibrosis. The mechanism of RSV-mediated inhibition of the proliferation of CFs at the microRNA level is not fully understood. We used TGF-β1 to induce CFs proliferation to simulate the pathogenesis of myocardial fibrosis. Neonatal rat CFs were treated with TGF-β1 in the presence or absence of resveratrol. Cell proliferation was measured using the CCK-8 and EdU assay. Collagen secretion was measured using hydroxyproline kit. Further, qPCR analysis was performed to determine microRNA levels after TGF-β1 or resveratrol treatment. To identify the target gene for miR-17, miR-17 was overexpressed or silenced, and the mRNA and protein levels of Smad7 were assessed. The effects of miR-17 silencing or Smad7 overexpression on cell proliferation and collagen secretion were also examined. Resveratrol treatment significantly decreased the TGF-β1-induced CF proliferation and collagen secretion. Resveratrol also decreased the levels of miR-17, miR-34a, and miR-181a in TGF-β1-treated CFs. Overexpression of miR-17 decreased the Smad7 mRNA and protein levels while silencing miR-17 increased them. Additionally, silencing miR-17 or overexpressing Smad7 decreased the TGF-β1-induced CFs proliferation and collagen secretion. In conclusion, resveratrol inhibits TGF-β1-induced CFs proliferation and collagen secretion. This inhibitory effect of resveratrol is orchestrated by the downregulation of miR-17 and the regulation of Smad7. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
7. Discovering the 'Dark matters' in expression data of miRNA based on the miRNA-mRNA and miRNA-lncRNA networks.
- Author
-
Pian, Cong, Zhang, Guangle, Wu, Sanling, and Li, Fei
- Subjects
MICRORNA ,GENE expression ,DARK matter ,MESSENGER RNA ,BIOMARKERS - Abstract
Background: Since miRNAs can play important roles in different cancer types, how to discover cancer related miRNAs is an important issue. In general, the miRNAs with differential expression is the focus of attention. However, some important cancer related miRNAs are not excavated by differential expression analysis. We take this type of miRNAs as 'dark matters' (DM-miRNA). It is our great interests to develop an algorithm to discover DM-miRNAs. Results: An effective method was developed to find DM-miRNAs. This method is mainly for mining potential DM-miRNAs by building basic miRNA-mRNA network (BMMN) and miRNA-lncRNA network (BMLN). The results indicate that miRNA-mRNA and miRNA-lncRNA interactions can be used as novel cancer biomarkers. Conclusions: The BMMN and BMLN can excavate the non-differentially expressed miRNAs which play an important role in the cancer. What's more, the edge biomarkers (miRNA-mRNA and miRNA-lncRNA interactions) contain more information than the node biomarkers. It will contribute to developing novel therapeutic candidates in cancers. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
8. Cynanbungeigenin C and D, a pair of novel epimers from Cynanchum bungei, suppress hedgehog pathway-dependent medulloblastoma by blocking signaling at the level of Gli.
- Author
-
Li, Xiao-Yu, Zhou, Li-Fei, Gao, Li-Juan, Wei, Yang, Xu, Shi-Fang, Chen, Feng-Yang, Huang, Wen-Jing, Tan, Wen-Fu, and Ye, Yi-Ping
- Subjects
- *
CELL proliferation , *CELL cycle , *MESSENGER RNA , *LUCIFERASES , *TUMOR suppressor genes - Abstract
Uncontrolled excessive activation of Hedgehog (Hh) signaling pathway is linked to a number of human malignant tumorigenesis. To obtain valuable Hh pathway inhibitors from natural product, in present study, a pair of novel epimers, Cynanbungeigenin C (CBC) and D (CBD) from the plant Cynanchum bungei Decne were chemically characterized by multiple spectroscopic data and chemical derivatization, and evaluated for their inhibition on Hh pathway. Mechanistically, CBC and CBD block Hh pathway signaling not through targeting Smo and Sufu, but at the level of Gli. In addition, both eipmers significantly suppress Hh pathway-dependent Ptch+/-; p53-/- medulloblastoma in vitro and in vivo. Furthermore, both CBC and CBD inhibited two Smo mutants induced Hh pathway activation, which suggested that they are potential compounds for the treatment of medulloblastoma with primary or acquired resistance to current Smo inhibitors. These results highlight the potential of CBC and CBD as effective lead compounds in the treatment of medulloblastoma and other Hh-dependent malignancy. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
9. Programmed death 1 Ligand 1 expression in breast cancer and its association with patients' clinical parameters.
- Author
-
Li, Fei, Ren, Yi, and Wang, Zhandong
- Subjects
- *
BREAST cancer patients , *POLYMERASE chain reaction , *MESSENGER RNA , *CYTOPLASM , *IMMUNOHISTOCHEMISTRY , *VASCULAR endothelial cells - Abstract
Objective: To evaluate the expression of programmed death 1 ligand 1 (PD-L1) in the cancer tissues and tumor-adjacent normal tissues of patients with invasive ductal carcinoma of the breast and to analyze the relationship between the expression of PD-L1 and the clinicopathological features of patients.Materials and Methods: This study included 112 cases of patients with invasive ductal carcinoma of breast who received surgical treatment from March 2012 to February 2016 in Xuzhou Cancer Hospital. The clinical materials of included patients were retrospectively analyzed. The immunohistochemical assay and real-time polymerase chain reaction (PCR) assay were applied to examine the expression of mRNA and protein of PD-L1 in breast cancer specimens of 112 cases and paired tumor-adjacent tissue specimens of 57 cases. The relationship between PD-L1 protein expression and clinicopathological features of patients was analyzed.Results: PD-L1 protein was mainly expressed in the cytoplasm. The positive rate of PD-L1 expression in invasive ductal carcinoma was 19.6% (22/112), and the positive rate of PD-L1 expression of tumor-adjacent normal tissues was 3.5% (2/57), indicating that the positive rate of PD-L1 expression of cancerous tissues was significantly higher than that of in tumor-adjacent normal tissues (P < 0.05); the positive expression of PD-L1 was not related with the patients' age, menopause history, family history of breast cancer, tumor size, and location of the tumor (P > 0.05) while it was related with lymph node metastasis, the clinic staging, and histopathological grading (P < 0.05). Real-time PCR was applied to detect the mRNA expression of PD-L1 in breast-invasive ductal carcinoma with the mean ΔCt value of 7.79 ± 2.25. However, the mRNA expression of PD-L1 in normal tumor-adjacent tissues was of low expression with the mean ΔCt value of 12.37 ± 3.33. The difference was statistically significant (P< 0.05).Conclusion: The expression of PD-L1 in breast-invasive ductal carcinoma was significantly increased, and it was related to histological grading, clinical staging, and lymph node metastasis of breast cancer. PD-L1 may be a significant marker for the prognosis of breast cancer patients. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
10. 11β-hydroxysteroid dehydrogenase types 1 and 2 in postnatal development of rat testis: gene expression, localization and regulation by luteinizing hormone and androgens
- Author
-
Ren-Shan Ge, Han Lin, Hong-Yu Zhou, Xin-Xin Chen, and Ai-Li Fei
- Subjects
Male ,endocrine system ,medicine.medical_specialty ,Urology ,11β-hydroxysteroid dehydrogenase type 1 ,11β-hydroxysteroid dehydrogenase type 2 ,development ,Leydig cell ,testis ,lcsh:RC870-923 ,Invited Commentary ,Internal medicine ,Testis ,mental disorders ,Gene expression ,medicine ,Animals ,reproductive and urinary physiology ,Testosterone ,Messenger RNA ,biology ,General Medicine ,Luteinizing Hormone ,lcsh:Diseases of the genitourinary system. Urology ,female genital diseases and pregnancy complications ,Rats ,Isoenzymes ,medicine.anatomical_structure ,Endocrinology ,Androgens ,biology.protein ,Immunohistochemistry ,Original Article ,11-beta-Hydroxysteroid Dehydrogenases ,Luteinizing hormone ,Hormone - Abstract
11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) and type 2 (11β-HSD2) are expressed in rat testis, where they regulate the local concentrations of glucocorticoids. Here, we investigated the expression and localization of 11β-HSD in rat testis during postnatal development, and the regulation of these genes by luteinizing hormone (LH) and androgens. mRNA and protein levels were analyzed by quantitative real-time-polymerase chain reaction and western blotting, respectively, in testes collected from rats at postnatal day (PND) 7, 14, 21, 35, and 90, and from rats treated with LH, 7α-methyl-19-nortestosterone (MENT) and testosterone at PND 21 and PND 90. Immunohistochemical staining was used to identify the localization of the 11β-HSD in rat testis at PND 7, 14, and 90. We found that 11β-HSD1 expression was restricted to the interstitial areas, and that its levels increased during rat testis development. In contrast, whereas 11β-HSD2 was expressed in both the interstitial areas and seminiferous tubules at PND 7, it was present only in the interstitial areas at PND 90, and its levels declined during testicular development. Moreover, 11β-HSD1 mRNA was induced by LH in both the PND 21 and 90 testes and by MENT at PND 21, whereas 11β-HSD2 mRNA was induced by testosterone and MENT in the PND 21 testis and by LH in the PND 90 testis. In conclusion, our study indicates that the 11β-HSD1 and 11β-HSD2 genes have distinct patterns of spatiotemporal expression and hormonal regulation during postnatal development of the rat testis.
- Published
- 2014
11. SOD mRNA and MDA Expression in Rectus Femoris Muscle of Rats with Different Eccentric Exercise Programs and Time Points.
- Author
-
Zhao, Heng, Liu, Jiani, Pan, Shinong, Sun, Yingwei, Li, Qi, Li, Fei, Ma, Li, and Guo, Qiyong
- Subjects
MESSENGER RNA ,MALONDIALDEHYDE ,GENE expression ,RECTUS femoris muscles ,LABORATORY rats ,SUPEROXIDE dismutase ,SKELETAL muscle physiology - Abstract
Purpose: Although superoxide dismutase (SOD) and malondialdehyde (MDA) affect Delayed Onset Muscle Soreness (DOMS), their effects are unclear in rectus femoris muscles (RFM) of rats with different eccentric exercise programs and time points. The purpose of this study is to investigate the effects of the various eccentric exercise programs at different time points on the SOD mRNA expression and MDA using rat as the animal model. Methods: 248 male rats were randomly divided into 4 groups: control group (CTL, n = 8), once-only exercise group (OEG, n = 80), continuous exercise group (CEG, n = 80), and intermittent exercise group (IEG, n = 80). Each exercise group was divided into 10 subgroups that exercised 0.5 h, 6 h, 12 h, 24 h, 48 h, 72 h, 96 h, 120 h, 144 h, or 168 h. Rats were sacrificed and their SOD mRNA expression, and MDA concentrations of skeletal muscle tissue were measured. Results: The specimen in all eccentric exercise programs showed increased RFM SOD1 mRNA expression levels at 0.5 h (P<0.05), and decreased RFM SOD3 mRNA expression at 0.5 h (P<0.05). The continuous eccentric exercise (CE) significantly enhanced muscle SOD2 mRNA level at 0.5 h (P<0.05). After once-only eccentric exercise (OE), SOD1, SOD2, and SOD3 mRNA expression significantly increased at 96 h, whereas MDA concentrations decreased at 96 h. After CE, the correlation coefficients of SOD1, SOD2, SOD3 mRNA expression levels and MDA concentrations were −0.814, −0.763, −0.845 (all P<0.05) at 12 h. Conclusion: Regular eccentric exercise, especially CE could enhance SOD1 and SOD2 mRNA expression in acute stage and the SOD2 mRNA expression correlates to MDA concentration in vivo, which may improve the oxidative adaption ability of skeletal muscles. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
12. The influence of forepaw palmar sensorimotor deprivation on learning and memory in young rats
- Author
-
Li, Fei, Zhang, Yuan-Yuan, Jing, Xin-Ming, Yan, Cong-Huai, and Shen, Xiao-Ming
- Subjects
- *
LABORATORY rats , *MEMORY , *MESSENGER RNA , *SHORT-term memory - Abstract
Abstract: This study examined the effects of early palmar forepaw sensorimotor deprivation on learning and memory in rats. Sensorimotor deprivation was performed on 18-day-old male rats. Controls were sham operated. Studies were performed on rats aged 18, 25, 35, 45 and 60 days. Morris water maze testing was used to assess learning and memory. Long-term potentiation (LTP) was assessed by electrophysiological means in slices obtained from the hippocampal Schaffer collateral pathway. Nissl staining was performed to assess pyramidal cell number in hippocampal CA1 and CA3 regions. Hippocampal N-methyl-d-aspartate receptor 1 (NMDAR1) mRNA and protein levels were assessed. Learning and short-term memory were significantly depressed in 25 and 35 day old sensorimotor deprived rats (P <0.01). LTP was also significantly depressed in sensorimotor deprived rats at these ages, while hippocampal CA1 pyramidal cell counts were significantly decreased (P <0.05). CA3 cell numbers were significantly lower in 25-day-old sensorimotor deprived rats (P <0.05). Both NMDAR1 mRNA and protein levels were significantly lower in sensorimotor deprived rats aged 25 and 35 days (P <0.05). These findings indicate that palmar surface forepaw sensorimotor deprivation impairs subsequent learning and memory in young rats. Decreased hippocampal pyramidal cell numbers and altered NMDAR1 expression may underlie this impairment. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
13. Effect of agmatine on DAMGO-induced mu-opioid receptor down-regulation and internalization via activation of IRAS, a candidate for imidazoline I1 receptor
- Author
-
Gao, Yan, Li, Fei, Wu, Ning, Su, Rui-Bin, Liu, Ying, Lu, Xin-Qiang, Liu, Yin, and Li, Jin
- Subjects
- *
AGMATINE , *OPIOID receptors , *IMIDAZOLINES , *CELLULAR mechanics , *CELL lines , *MESSENGER RNA - Abstract
Abstract: Agmatine, an endogenous ligand for imidazoline I1 receptor, has previously been shown to prevent opioid tolerance in rats and mice, but the cellular mechanisms remain unknown. In the present study, the effects of agmatine activation on imidazoline I1 receptor on the desensitization, down-regulation and internalization of μ opioid receptor were investigated. Two cell lines, CHO cells transfected μ opioid receptor (CHO-μ cells) and co-transfected μ opioid receptor and imidazoline I1 receptor antisera-selected protein (IRAS) (CHO-μ/IRAS cells), were used. In both CHO-μ cells and CHO-μ/IRAS cells, agmatine (0.01–10 μM) did not affect the desensitization of μ opioid receptor induced by [d-Ala2, N-Me-Phe4,Gly5-ol]-enkephalin (DAMGO) (10 μM) treatment for 30 min. However, agmatine (0.1–100 nM) co-pretreatment with DAMGO (1 μM) for 12 h concentration-dependently inhibited DAMGO-induced down-regulation of μ opioid receptor in CHO-μ/IRAS cells, but not in CHO-μ cells. Efaroxan, the I1/α2-adrenoceptors mix antagonist, completely reversed the inhibitory effect of agmatine, suggesting the participation of imidazoline I1 receptor. In addition, agmatine (1–100 nM) inhibited DAMGO-induced internalization of μ opioid receptor in CHO-μ/IRAS cells, which was reversed by efaroxan as well. While treatment with DAMGO (1 μM) or co-treatment with agmatine (1–100 nM) for 12 h failed to affect the mRNA level of μ opioid receptor. Taken together, these results indicate that the inhibitory effect of agmatine on tolerance in vitro might be related to attenuation of the internalization and down-regulation of μ opioid receptor via activation of imidazoline I1 receptor. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
- View/download PDF
14. Thymosinα1 stimulates cell proliferation by activating ERK1/2, JNK, and increasing cytokine secretion in human pancreatic cancer cells
- Author
-
Li, Min, Feurino, Louis W., Li, Fei, Wang, Hao, Zhai, Qihui, Fisher, William E., Chen, Changyi, and Yao, Qizhi
- Subjects
- *
THYMOSIN , *CANCER cell proliferation , *CYTOKINES , *MESSENGER RNA , *RNA metabolism , *BIOCHEMISTRY , *CELL lines , *CELL physiology , *COMPARATIVE studies , *DOSE-effect relationship in pharmacology , *GENES , *IMMUNOHISTOCHEMISTRY , *INTERLEUKINS , *PHENOMENOLOGY , *RESEARCH methodology , *MEDICAL cooperation , *PANCREATIC tumors , *PEPTIDE hormones , *POLYMERASE chain reaction , *RESEARCH , *RNA , *T cells , *TRANSFERASES , *EVALUATION research , *REVERSE transcriptase polymerase chain reaction - Abstract
Abstract: In this study, we investigated the expression and function of thymosinα1 (Thyα1) in human pancreatic cancer. We found that human pancreatic cancer cell lines Panc-1, Panc03.27, ASPC-1, and PL45 cells significantly over-expressed the mRNA of Thyα1 as compared to the normal human pancreatic ductal epithelium (HPDE) cells.. Thyα1 mRNA and protein levels were also over-expressed in clinical pancreatic adenocarcinoma specimens. In addition, synthetic Thyα1 significantly promoted Panc-1 cell proliferation and increased phosphorylation of ERK1/2 and JNK. Furthermore, Thyα1 increased the secretion of multiple cytokines including IL-10, IL-13, and IL-17 in Panc-1 cells. Thus, Thyα1 may have a new role in pancreatic cancer pathogenesis. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
- View/download PDF
15. Effect of cyclophilin A on gene expression in human pancreatic cancer cells
- Author
-
Li, Min, Wang, Hao, Li, Fei, Fisher, William E., Chen, Changyi, and Yao, Qizhi
- Subjects
- *
PANCREATIC tumors , *CANCER cells , *MESSENGER RNA , *POLYMERASE chain reaction - Abstract
Abstract: Background: We previously found that cyclophilin A (CypA) is overexpressed in human pancreatic cancer cells and stimulates cell proliferation through CD147. In this study, we further investigated the effect of CypA on gene expression of several key molecules that are involved in pancreatic cancer cell proliferation. Methods: Human pancreatic cancer cell lines (Panc-1, MIA PaCa-2, and BxPC-3) and human pancreatic ductal epithelial (HPDE) cells were used. The messenger RNA (mRNA) levels of CypA, CypB, CD147, neuropilins (NRPs), vascular endothelial growth factor (VEGF), and VEGF receptors upon the treatment of exogenous recombinant human CypA were determined by real-time reverse-transcription polymerase chain reaction. Results: Exogenous human recombinant CypA reduced the mRNA levels of NRP-1 and VEGF, but not endogenous CypA, CypB, and CD147, in Panc-1, MIA PaCa-2, and BxPC-3 cells. In contrast, HPDE cells showed a decrease of endogenous CypA and CD147 mRNA, but not detectable changes of CypB, NRPs, and VEGF mRNA levels upon exogenous CypA treatment. Conclusions: These data show that exogenous CypA downregulates NRP-1 and VEGF expression in pancreatic cancer cells. This effect is different in normal HPDE cells. Thus, soluble CypA may affect cell growth of pancreatic cancer. [Copyright &y& Elsevier]
- Published
- 2005
- Full Text
- View/download PDF
16. Tetrabromobisphenol A induced reproductive endocrine-disrupting effects in mussel Mytilus galloprovincialis.
- Author
-
Wang, Shuang, Ji, Chenglong, Li, Fei, Zhan, Junfei, Sun, Tao, Tang, Jianhui, and Wu, Huifeng
- Subjects
- *
MYTILUS galloprovincialis , *MARINE pollution , *MUSSELS , *MARINE invertebrates , *MESSENGER RNA - Abstract
Tetrabromobisphenol A (TBBPA) pollution in marine environmental media poses great risks to marine organisms due to its potential endocrine-disrupting effects. However, limited attention of TBBPA's endocrine-disrupting effects has been paid on marine invertebrates. In this work, the reproductive endocrine-disrupting effects of TBBPA were evaluated by observing the gametes development, quantifying the gender-specific gene expression, and determining vertebrate sex hormones in mussels Mytilus galloprovincialis treated with TBBPA for 30 days. Additionally, transcriptomic profiling and enzymes activities were conducted to investigate the potential mechanisms of reproductive endocrine-disrupting effects. We found that promotion of gametogenesis and alterations of vertebrate sex hormones occurred in TBBPA-treated mussels of both sexes. Meanwhile, estrogen sulfotransferase (SULT1E1) and steroid sulfatase (STS) were up-regulated at transcript level as a result of TBBPA treatments, suggesting that TBBPA disrupted the steroidogenesis in mussels through promoting steroids sulfonation and hydrolysis of sulfate steroids. The induction of SULTs for TBBPA biotransformation might be responsible for the dysregulation of steroidogenesis and steroids metabolism. Overall, these findings provide a new insight into assessing impact of TBBPA as well as TBBPA biomonitoring in marine environment. [Display omitted] • TBBPA exposure induced reproductive endocrine-disrupting effects in mussel. • TBBPA exposure promoted gametogenesis and altered sex steroids levels in mussel. • SULT1E1 and STS at both transcript and protein levels were altered by TBBPA. • Steroids sulfonation and hydrolysis of sulfate steroids were the targets of TBBPA. • TBBPA biotransformation might be responsible for its endocrine-disrupting effects. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
17. New neolignans from the seeds of Myristica fragrans that inhibit nitric oxide production.
- Author
-
Cao, Gui-Yun, Xu, Wei, Yang, Xiu-Wei, Gonzalez, Frank J., and Li, Fei
- Subjects
- *
NEOLIGNANS , *COMPOSITION of seeds , *NITRIC-oxide synthase inhibitors , *LIPOPOLYSACCHARIDES , *POLYMERASE chain reaction , *MESSENGER RNA , *NUTMEG tree - Abstract
Five new 8- O -4′ type neolignans, named myrifralignan A–E ( 1 – 5 ), together with five known analogues ( 6 – 10 ), were isolated from the seeds of Myristica fragrans Houtt. Their chemical structures were determined using several spectroscopic methods. Compounds 3 – 10 exhibited potent inhibitory activity against the production of nitric oxide (NO) in the RAW264.7 cell line stimulated by lipopolysaccaride. Myrislignan ( 7 ) and machilin D ( 10 ) were the most potent inhibitors of NO production amongst these compounds. The IC 50 values of myrislignan and machilin D were 21.2 and 18.5 μM. And, their inhibitory activity was more than L - N 6 -(1-iminoethyl)-lysine, a selective inhibitor of inducible nitric oxide synthase (IC 50 = 27.1 μM). Furthermore, real-time PCR analysis revealed that these neolignans could significantly suppress the expression of inducible nitric oxide synthase mRNA. These results demonstrated that the 8- O -4′ type neolignans are promising candidates as anti-inflammatory agents. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
18. Mechanisms elevating ORMDL3 expression in recurrent wheeze patients: Role of Ets-1, p300 and CREB
- Author
-
Jin, Rui, Xu, Hua-Guo, Yuan, Wen-Xiao, Zhuang, Li-Li, Liu, Li-Fei, Jiang, Li, Zhu, Liang-Hua, Liu, Jia-Yin, and Zhou, Guo-Ping
- Subjects
- *
WHEEZE , *GENE expression , *MESSENGER RNA , *RNA interference , *IMMUNOPRECIPITATION , *STATISTICAL correlation , *LUCIFERASES - Abstract
Abstract: The first genetic factor identified for childhood asthma by genome-wide association study (GWAS) is the locus on chromosome 17q21, harboring the Orosomucoid 1-like 3 (ORMDL3) gene. ORMDL3 is implicated in facilitation of endoplasmic reticulum-mediated inflammatory responses, believed to underlie its association with asthma. In the present study, we demonstrated that mRNA expression of ORMDL3 is significantly increased in the peripheral blood of recurrent wheeze patients compared with normal control subjects by real-time RT-PCR. To elucidate the molecular mechanisms involved in human ORMDL3 regulation, we cloned and characterized the promoter region of ORMDL3. Applying 5′-rapid amplification of cDNA end analysis (RACE), we revealed that ORMDL3 gene used multiple transcriptional start sites (TSSs). Using a series of 5′ deletion promoter plasmids in luciferase reporter assays, we identified that the proximal minimal promoter of ORMDL3 was located within the region −84/+58 relative to the TSS. Mutational analysis, RNA interference experiments and sequential chromatin immunoprecipitation (ChIP) assay demonstrated that transcriptional activity of the ORMDL3 gene was cooperatively regulated by multiple transcription factors, including Ets-1, p300 and CREB. The expression levels of Ets-1, p300 and CREB were increased in the peripheral blood of recurrent wheeze patients compared with normal control subjects and showed a strong linear correlation with the expression of ORMDL3. Our findings indicate that Ets-1, p300 and CREB binding to the promoter region drive the ORMDL3 transcription. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
19. Experimental SSM-CVB3 infection in macaques
- Author
-
Han, Tiesuo, He, Wenqi, Song, Deguang, Zhao, Kui, Wu, Chenchen, Gao, Feng, Lu, Huijun, Gai, Xianying, Wang, Xinrui, Li, Fei, Ji, Cuicui, and Lin, Xijuan
- Subjects
- *
MYOCARDITIS , *MACAQUES , *SYMPTOMS , *HISTOPATHOLOGY , *BLOOD serum analysis , *MESSENGER RNA , *COXSACKIEVIRUSES , *ADENOVIRUSES - Abstract
Abstract: Objective: To evaluate the pathogenicity of SSM-CVB3 in a macaque model. Methods: The clinical symptoms of macaques were recorded; hematological, biochemical and histopathological evaluations were completed; viral titers and neutralization titers (NT-titers) in sera were tested; and the mRNA levels of SSM-CVB3, coxsackievirus and adenovirus receptor (CAR) and decay accelerating factor (DAF) were determined. Results: After SSM-CVB3 infection, the macaques showed a lack of activity, a poor appetite, a higher body temperature, and severe diarrhea. The macaques also developed hematuria and albuminuria at 4 to 10days post-inoculation. Virus titers (5.1–6.5 LogTCID50/mL) were higher at 6 to 10days post-inoculation, and NT-titers (6.5–7.3 Log2) reached plateaus at 8 to 14days post-inoculation. The infected macaques developed serious anemia with decreased RBC and WBC, but the percentages of LYM were increased. The levels of CK, CK-MB, AST and ALT in the sera were 84–169U/L, 87.6–271.1U/L, 43–87U/L and 43–82U/L, respectively, and all of those were higher than normal. Histological analysis showed obvious cardiac, hepatic and renal damages in the infected macaques and the mRNA contents of SSM-CVB3, CAR and DAF in the heart, liver and kidneys of infected macaques were higher (P<0.05). Conclusion: This was the first report on experimental SSM-CVB3 infections in macaques with serious hepatic and renal damage, except for myocarditis. The information obtained from this study suggests that the SSM-CVB3 strain and this macaque model could be used for studying CVB3-induced cardiac, hepatic or renal diseases. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.