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Pang FC, Lai SS. Establishment of the Primary Healthcare Commission. Hong Kong Med J 2023; 29:6-7. [PMID: 36603856 DOI: 10.12809/hkmj235137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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2
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Yang CF, Lai SS, Chen YH, Liu D, Liu B, Ai C, Wan XZ, Gao LY, Chen XH, Zhao C. Anti-diabetic effect of oligosaccharides from seaweed Sargassum confusum via JNK-IRS1/PI3K signalling pathways and regulation of gut microbiota. Food Chem Toxicol 2019; 131:110562. [PMID: 31181236 DOI: 10.1016/j.fct.2019.110562] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 06/05/2019] [Accepted: 06/06/2019] [Indexed: 12/18/2022]
Abstract
Brown seaweed Sargassum confusum (C. Agardh) has been used in traditional Chinese medicine to treat a variety of diseases. The aim of the present study was to evaluate the anti-diabetic effect of oligosaccharides from brown seaweed S. confusum (SCO). The anti-diabetic effect of SCO was evaluated in vivo using high-fat/high-sucrose fed hamsters. Molecular mechanisms of modulating gene expression of specific members of insulin signaling pathways were determined. The components of the intestinal microflora in diabetic animals were also analyzed by high-throughput 16S rRNA gene sequencing. And it was found that SCO had a sequence of sulfated anhydrogalactose and methyl sulfated galactoside units. Fasting blood glucose levels were significantly decreased after SCO administration. Histology showed that SCO could protect the cellular architecture of the liver. SCO could also significantly increase the relative abundance of Lactobacillus and Clostridium XIVa and decrease that of Allobaculum, Bacteroides and Clostridium IV. The active role of SCO in anti-diabetic effect was revealed by its regulation of insulin receptor substrate 1/phosphatidylinositol 3-kinase and c-Jun N-terminal kinase pathways. These results suggested that SCO might be used as a functional material to regulate gut microbiota in obese and diabetic individuals.
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Affiliation(s)
- Cheng-Feng Yang
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Shan-Shan Lai
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Yi-Han Chen
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Dan Liu
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Bin Liu
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Chao Ai
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China
| | - Xu-Zhi Wan
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Lu-Ying Gao
- Department of Pediatrics, Nanjing First Hospital, Nanjing Medical University, Nanjing, 210006, China
| | - Xin-Hua Chen
- Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR China
| | - Chao Zhao
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR China; Institute of Chinese Medical Sciences, State Key Laboratory of Quality Control in Chinese Medicine, University of Macau, Taipa, Macau, China.
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3
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Lai SS, Fu X, Cheng Q, Yu ZH, Jiang EZ, Zhao DD, Yu DC, Qiu YD, Gao X, Ju HX, Wang W, Jiang Q, Zhu MS, Li CJ, Xue B. HSC-specific knockdown of GGPPS alleviated CCl 4-induced chronic liver fibrosis through mediating RhoA/Rock pathway. Am J Transl Res 2019; 11:2382-2392. [PMID: 31105844 PMCID: PMC6511779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 02/07/2019] [Indexed: 06/09/2023]
Abstract
Hepatic stellate cells (HSCs) play a critical role in the pathogenesis and reversal of liver fibrosis. Targeting HSCs is of great significance in the treatment of hepatic fibrosis, and has attracted wide attention of scholars. Here we demonstrated that expression of geranylgeranyldiphosphate synthase (GGPPS) predominantly increased in HSCs in murine fibrotic liver. HSC-specific knockdown of GGPPS using vitamin A-coupled liposome carrying siRNA-ggpps decreased activation of HSCs and alleviated fiber accumulation in vivo. Furthermore, our in vitro studies showed that GGPPS was up-regulated during HSCs activation in TGF-β1-dependent manner. Inhibition of GGPPS suppressed TGF-β1 induced F-actin reorganization and HSCs activation in LX-2 cells. Further, we found that GGPPS regulated HSCs activation and liver fibrosis possibly by enhancing RhoA/Rock kinase signaling. So its concluded that GGPPS promotes liver fibrosis by activating HSCs, which may represent a potential target for anti-fibrosis therapies.
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Affiliation(s)
- Shan-Shan Lai
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal UniversityNanjing 210023, China
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
| | - Xiao Fu
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
- Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing UniversityNanjing 210093, China
| | - Qi Cheng
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
| | - Zi-Han Yu
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
| | - En-Ze Jiang
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
| | - Dan-Dan Zhao
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
- Research Center, Shanghai Chest Hospital, Shanghai Jiao Tong UniversityShanghai 200030, China
| | - De-Cai Yu
- Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing UniversityNanjing 210093, China
| | - Yu-Dong Qiu
- Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing UniversityNanjing 210093, China
| | - Xiang Gao
- Key Laboratory of Model Animal for Disease Study of Ministry of Education, Model Animal Research Center, Nanjing UniversityNanjing 210093, China
| | - Huang-Xian Ju
- MOE Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing UniversityNanjing 210093, China
| | - Wei Wang
- National Laboratory of Solid State Microstructures, Department of Physics, Nanjing UniversityNanjing 210093, China
| | - Qing Jiang
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing UniversityNanjing 210008, China
- Joint Research Center for Bone and Joint Disease, Model Animal Research Center (MARC), Nanjing UniversityNanjing 210093, China
| | - Min-Sheng Zhu
- Key Laboratory of Model Animal for Disease Study of Ministry of Education, Model Animal Research Center, Nanjing UniversityNanjing 210093, China
| | - Chao-Jun Li
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
| | - Bin Xue
- Core Laboratory, Sir Run Run Hospital, Nanjing Medical UniversityNanjing 211166, China
- Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
- State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing UniversityNanjing 210093, China
- State Key Laboratory of Natural Medicines, China Pharmaceutical UniversityNanjing 210009, China
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4
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Zhao DD, Yuan J, Cheng Q, Qi YL, Lu K, Lai SS, Sun Q, Zhao Y, Fang L, Jin ML, Yu DC, Qiu YD, Li CJ, Chen J, Xue B. Evidence for a role of geranylgeranylation in renal angiomyolipoma and renal epithelioid angiomyolipoma. Oncol Lett 2019; 17:1523-1530. [PMID: 30675208 PMCID: PMC6341897 DOI: 10.3892/ol.2018.9808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 10/19/2018] [Indexed: 01/17/2023] Open
Abstract
Research on mevalonate kinase deficiency has revealed that it may lead to the development of renal angiomyolipomas (RAMLs). Thus, it was suspected that geranylgeranyl pyrophosphate synthase (GGPPS), a key enzyme in the mevalonate pathway, may be involved in the development of RAMLs. In the present study, the expression of GGPPS in RAMLs and renal epithelioid angiomyolipomas (REAs) was assessed, and paraffin embedded specimens from 60 patients, including 9 cases with REA and 51 cases with RAML, were examined. Immunoreactivity was evaluated semi-quantitatively according to the intensity of staining and the percentage of positively stained cells. The results indicated that GGPPS was predominantly present in the cytoplasm, and REA tissues exhibited higher expression of GGPPS in the cytoplasm compared with RAML tissues. It was also identified that GGPPS was upregulated in TSC2-null cells, and inhibition of GGPPS could induce apoptosis of TSC2-null cells by autophagy. In conclusion, the increased expression of GGPPS in RAMLs and REAs indicated that mevalonate pathways may be involved in disease progression. GGPPS may serve as a potential therapeutic target and the current results may provide a novel therapeutic strategy for RAML and lymphangioleiomyomatosis.
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Affiliation(s)
- Dan-Dan Zhao
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Research Center, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
| | - Jun Yuan
- Biochemical and Environmental Engineering School of Xiaozhuang College, Nanjing 211171, P.R. China
| | - Qi Cheng
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Ya-Ling Qi
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Ke Lu
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Shan-Shan Lai
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu 210023, P.R. China
| | - Qian Sun
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Yue Zhao
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Lei Fang
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Mei-Ling Jin
- Pulmonary Department, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - De-Cai Yu
- Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu 210008, P.R. China
| | - Yu-Dong Qiu
- Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu 210008, P.R. China
| | - Chao-Jun Li
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China
| | - Jun Chen
- Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Department of Pathology, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, Jiangsu 210008, P.R. China
| | - Bin Xue
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine and School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,Liver Disease Collaborative Research Platform of Medical School of Nanjing University, Nanjing, Jiangsu 210093, P.R. China.,State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu 210009, P.R. China
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Wu J, Tao WW, Chong DY, Lai SS, Wang C, Liu Q, Zhang TY, Xue B, Li CJ. Early growth response-1 negative feedback regulates skeletal muscle postprandial insulin sensitivity via activating Ptp1b transcription. FASEB J 2018. [PMID: 29543533 DOI: 10.1096/fj.201701340r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Postprandial insulin desensitization plays a critical role in maintaining whole-body glucose homeostasis by avoiding the excessive absorption of blood glucose; however, the detailed mechanisms that underlie how the major player, skeletal muscle, desensitizes insulin action remain to be elucidated. Herein, we report that early growth response gene-1 ( Egr-1) is activated by insulin in skeletal muscle and provides feedback inhibition that regulates insulin sensitivity after a meal. The inhibition of the transcriptional activity of Egr-1 enhanced the phosphorylation of the insulin receptor (InsR) and Akt, thus increasing glucose uptake in L6 myotubes after insulin stimulation, whereas overexpression of Egr-1 decreased insulin sensitivity. Furthermore, deletion of Egr-1 in the skeletal muscle improved systemic insulin sensitivity and glucose tolerance, which resulted in lower blood glucose levels after refeeding. Mechanistic analysis demonstrated that EGR-1 inhibited InsR phosphorylation and glucose uptake in skeletal muscle by binding to the proximal promoter region of protein tyrosine phosphatase-1B (PTP1B) and directly activating transcription. PTP1B knockdown largely restored insulin sensitivity and enhanced glucose uptake, even under conditions of EGR-1 overexpression. Our results indicate that EGR-1/PTP1B signaling negatively regulates postprandial insulin sensitivity and suggest a potential therapeutic target for the prevention and treatment of excessive glucose absorption.-Wu, J., Tao, W.-W., Chong, D.-Y., Lai, S.-S., Wang, C., Liu, Q., Zhang, T.-Y., Xue, B., Li, C.-J. Early growth response-1 negative feedback regulates skeletal muscle postprandial insulin sensitivity via activating Ptp1b transcription.
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Affiliation(s)
- Jing Wu
- Medicine School of Nanjing University, Nanjing, China
| | - Wei-Wei Tao
- Model Animal Research Center, Nanjing University, Nanjing, China
| | - Dan-Yang Chong
- Model Animal Research Center, Nanjing University, Nanjing, China
| | - Shan-Shan Lai
- Model Animal Research Center, Nanjing University, Nanjing, China
| | - Chuang Wang
- Medicine School of Nanjing University, Nanjing, China
| | - Qi Liu
- Medicine School of Nanjing University, Nanjing, China
| | - Tong-Yu Zhang
- Model Animal Research Center, Nanjing University, Nanjing, China
| | - Bin Xue
- Medicine School of Nanjing University, Nanjing, China
| | - Chao-Jun Li
- Medicine School of Nanjing University, Nanjing, China.,Model Animal Research Center, Nanjing University, Nanjing, China
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Lai SS, Zhao DD, Cao P, Lu K, Luo OY, Chen WB, Liu J, Jiang EZ, Yu ZH, Lee G, Li J, Yu DC, Xu XJ, Zhu MS, Gao X, Li CJ, Xue B. PP2Acα positively regulates the termination of liver regeneration in mice through the AKT/GSK3β/Cyclin D1 pathway. J Hepatol 2016; 64:352-360. [PMID: 26456844 DOI: 10.1016/j.jhep.2015.09.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 09/17/2015] [Accepted: 09/25/2015] [Indexed: 02/09/2023]
Abstract
BACKGROUND & AIMS Liver injury triggers a highly organized and ordered liver regeneration (LR) process. Once regeneration is complete, a stop signal ensures that the regenerated liver is an appropriate functional size. The inhibitors and stop signals that regulate LR are unknown, and only limited information is available about these mechanisms. METHODS A 70% partial hepatectomy (PH) was performed in hepatocyte-specific PP2Acα-deleted (PP2Acα(-/-)) and control (PP2Acα(+/+)) mice. LR was estimated by liver weight, serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels and cell proliferation, and the related cellular signals were analyzed. RESULTS We found that the catalytic subunit of PP2A was markedly upregulated during the late stage of LR. PP2Acα(-/-) mice showed prolonged LR termination, an increased liver size compared to the original mass and lower levels of serum ALT and AST compared with control mice. In these mice, cyclin D1 protein levels, but not mRNA levels, were increased. Mechanistically, AKT activated by the loss of PP2Acα inhibited glycogen synthase kinase 3β (GSK3β) activity, which led to the accumulation of cyclin D1 protein and accelerated hepatocyte proliferation at the termination stage. Treatment with the PI3K inhibitor wortmannin at the termination stage was sufficient to inhibit cyclin D1 accumulation and hepatocyte proliferation. CONCLUSIONS PP2Acα plays an essential role in the proper termination of LR via the AKT/GSK3β/Cyclin D1 pathway. Our findings enrich the understanding of the molecular mechanism that controls the termination of LR and provides a potential therapeutic target for treating liver injury.
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Affiliation(s)
- Shan-Shan Lai
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Dan-Dan Zhao
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Peng Cao
- Jiangsu Province Hospital on Integration of Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing 210028, China; Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Chinese Medicine, Nanjing 210028, China
| | - Ke Lu
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Ou-Yang Luo
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Wei-Bo Chen
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China; Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210093, China
| | - Jia Liu
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - En-Ze Jiang
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Zi-Han Yu
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Gina Lee
- Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - Jing Li
- Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - De-Cai Yu
- Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210093, China
| | - Xiao-Jun Xu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
| | - Min-Sheng Zhu
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China
| | - Xiang Gao
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China.
| | - Chao-Jun Li
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China.
| | - Bin Xue
- State Key Laboratory of Pharmaceutical Biotechnology and Jiangsu Key Laboratory of Molecular Medicine, Model Animal Research Center and School of Medicine, Nanjing University, Nanjing 210093, China.
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Tao W, Wu J, Zhang Q, Lai SS, Jiang S, Jiang C, Xu Y, Xue B, Du J, Li CJ. EGR1 regulates hepatic clock gene amplitude by activating Per1 transcription. Sci Rep 2015; 5:15212. [PMID: 26471974 PMCID: PMC4607941 DOI: 10.1038/srep15212] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Accepted: 09/21/2015] [Indexed: 01/27/2023] Open
Abstract
The mammalian clock system is composed of a master clock and peripheral clocks. At the molecular level, the rhythm-generating mechanism is controlled by a molecular clock composed of positive and negative feedback loops. However, the underlying mechanisms for molecular clock regulation that affect circadian clock function remain unclear. Here, we show that Egr1 (early growth response 1), an early growth response gene, is expressed in mouse liver in a circadian manner. Consistently, Egr1 is transactivated by the CLOCK/BMAL1 heterodimer through a conserved E-box response element. In hepatocytes, EGR1 regulates the transcription of several core clock genes, including Bmal1, Per1, Per2, Rev-erbα and Rev-erbβ, and the rhythm amplitude of their expression is dependent on EGR1's transcriptional function. Further mechanistic studies indicated that EGR1 binds to the proximal region of the Per1 promoter to activate its transcription directly. When the peripheral clock is altered by light or feeding behavior transposition in Egr1-deficient mice, the expression phase of hepatic clock genes shifts normally, but the amplitude is also altered. Our data reveal a critical role for EGR1 in the regulation of hepatic clock circuitry, which may contribute to the rhythm stability of peripheral clock oscillators.
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Affiliation(s)
- Weiwei Tao
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Jing Wu
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Qian Zhang
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Shan-Shan Lai
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Shan Jiang
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Chen Jiang
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Ying Xu
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Bin Xue
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
| | - Jie Du
- Beijing Anzhen Hospital, Capital Medical University, Beijing, 100029, China
| | - Chao-Jun Li
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing 210093, China
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Wang XX, Ying P, Diao F, Wang Q, Ye D, Jiang C, Shen N, Xu N, Chen WB, Lai SS, Jiang S, Miao XL, Feng J, Tao WW, Zhao NW, Yao B, Xu ZP, Sun HX, Li JM, Sha JH, Huang XX, Shi QH, Tang H, Gao X, Li CJ. Altered protein prenylation in Sertoli cells is associated with adult infertility resulting from childhood mumps infection. ACTA ACUST UNITED AC 2013; 210:1559-74. [PMID: 23825187 PMCID: PMC3727317 DOI: 10.1084/jem.20121806] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Loss of GGPPS from childhood mumps infection or deletion in mice results in constitutively activated MAPK and NF-kB signaling that induces spermatogonium apoptosis, macrophage invasion into seminiferous tubules, and sterility. Mumps commonly affects children 5–9 yr of age, and can lead to permanent adult sterility in certain cases. However, the etiology of this long-term effect remains unclear. Mumps infection results in progressive degeneration of the seminiferous epithelium and, occasionally, Sertoli cell–only syndrome. Thus, the remaining Sertoli cells may be critical to spermatogenesis recovery after orchitis healing. Here, we report that the protein farnesylation/geranylgeranylation balance is critical for patients’ fertility. The expression of geranylgeranyl diphosphate synthase 1 (GGPPS) was decreased due to elevated promoter methylation in the testes of infertile patients with mumps infection history. When we deleted GGPPS in mouse Sertoli cells, these cells remained intact, whereas the adjacent spermatogonia significantly decreased after the fifth postnatal day. The proinflammatory MAPK and NF-κB signaling pathways were constitutively activated in GGPPS−/− Sertoli cells due to the enhanced farnesylation of H-Ras. GGPPS−/− Sertoli cells secreted an array of cytokines to stimulate spermatogonia apoptosis, and chemokines to induce macrophage invasion into the seminiferous tubules. Invaded macrophages further blocked spermatogonia development, resulting in a long-term effect through to adulthood. Notably, this defect could be rescued by GGPP administration in EMCV-challenged mice. Our results suggest a novel mechanism by which mumps infection during childhood results in adult sterility.
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Affiliation(s)
- Xiu-Xing Wang
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center and Jiangsu Key Laboratory of Molecular Medicine of the School of Medicine, Nanjing University, National Resource Center for Mutant Mice, Nanjing 210061, China
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Lai SS, Xue B, Yang Y, Zhao L, Chu CS, Hao JY, Wen CJ. Ror2-Src signaling in metastasis of mouse melanoma cells is inhibited by NRAGE. Cancer Genet 2012; 205:552-62. [PMID: 23142633 DOI: 10.1016/j.cancergen.2012.09.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Revised: 09/05/2012] [Accepted: 09/20/2012] [Indexed: 11/29/2022]
Abstract
The receptor tyrosine kinase (RTK) Ror2 plays important roles in developmental morphogenesis and mediates the filopodia formation in Wnt5a-induced cell migration. However, the function of Ror2 in noncanonical Wnt signaling resulting in cancer metastasis is largely unknown. Here, we show that Ror2 expression is higher in the highly metastatic murine B16-BL6 melanoma cells than in the low metastatic variant B16 cells. Overexpression of Ror2 increases the metastasis ability of B16 cells, and knockdown of Ror2 reduces the migration ability of B16-BL6 cells. Furthermore, the inhibition of Src kinase activity is critical for the Ror2-mediated cell migration upon Wnt5a treatment. The C-terminus of Ror2, which is deleted in brachydactyly type B (BDB), is essential for the mutual interaction with the SH1 domain of Src. Intriguingly, the Neurotrophin receptor-interacting MAGE homologue (NRAGE), which, as we previously reported, can remodel the cellular skeleton and inhibit cell-cell adhesion and metastasis of melanoma and pancreatic cancer, sharply blocks the interaction between Src and Ror2 and inhibits Ror2-mediated B16 cell migration by decreasing the activity of Src and focal adhesion kinase (FAK). Our data show that Ror2 is a potential factor in the tumorigenesis and metastasis in a Src-dependent manner that is negatively regulated by NRAGE.
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Affiliation(s)
- Shan-Shan Lai
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, Nanjing Normal University, and Medical School of Nanjing University, Nanjing, China
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10
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Shen N, Shao Y, Lai SS, Qiao L, Yang RL, Xue B, Pan FY, Chen HQ, Li CJ. GGPPS, a new EGR-1 target gene, reactivates ERK 1/2 signaling through increasing Ras prenylation. Am J Pathol 2011; 179:2740-50. [PMID: 21983072 DOI: 10.1016/j.ajpath.2011.08.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 07/31/2011] [Accepted: 08/12/2011] [Indexed: 10/17/2022]
Abstract
Cigarette smoke activates the extracellular signal-regulated kinase (ERK) 1/2 mitogen activated-protein kinase pathway, which, in turn, is responsible for early growth response gene-1 (EGR-1) activation. Here we provide evidence that EGR-1 activation can also reactivate ERK 1/2 mitogen activated-protein kinase through a positive feedback loop through its target gene (geranylgeranyl diphosphate synthase) GGPPS. For the first time, the GGPPS gene is identified as a target of EGR-1, as EGR-1 can directly bind to the predicted consensus-binding site in the GGPPS promoter and regulate its transcription. Long-term observations show that there are two ERK 1/2 phosphorylation peaks after cigarette smoke extract stimulation in human lung epithelial Beas-2B cells. The first peak (at 10 minutes) is responsible for EGR-1 accumulation, and the second (at 4 hours) is diminished after the disruption of EGR-1 transcriptional activity. EGR-1 overexpression enhances Ras prenylation and membrane association in a GGPPS-dependent manner, and it augments ERK 1/2 activation. Likewise, a great reduction of the second peak of ERK 1/2 phosphorylation is observed during long-term cigarette smoke extract stimulation in cells where GGPPS is disrupted. Thus, we have uncovered an intricate positive feedback loop in which ERK 1/2-activated EGR-1 promotes ERK 1/2 reactivation through promoting GGPPS transcription, which might affect cigarette smoke-related lung pathological processes.
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Affiliation(s)
- Ning Shen
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center and the Medical School of Nanjing University, National Resource Center for Mutant Mice, Nanjing, China
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11
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Pan CH, Jong MH, Huang TS, Liu HF, Lin SY, Lai SS. Phylogenetic analysis of classical swine fever virus in Taiwan. Arch Virol 2005; 150:1101-19. [PMID: 15703847 DOI: 10.1007/s00705-004-0485-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2004] [Accepted: 12/10/2004] [Indexed: 11/28/2022]
Abstract
Two envelope glycoprotein (Erns and E2) regions of the classical swine fever virus (CSFV) were amplified by RT-PCR and sequenced directly from 158 specimens collected between 1989 and 2003 in Taiwan. Phylogenetic analysis of the two regions revealed a similar tree topology and the Erns region provided better discrimination than the E2 region. One hundred and fifteen isolates out of the 158 isolates were clustered within subgroup 2.1 (further classified as 2.1a and 2.1b) and 2.2, which were considered to be likely of the introduced strains, whereas the remaining 43 isolates were clustered within subgroup 3.4 and were considered to be of the endemic strains. The subgroup 2.1a viruses were first detected in 1994 and predominated from 1995 onwards. However, subgroup 3.4 viruses were prevalent in the early years, not being isolated after 1996. We have observed a dramatic switch in genotype from subgroup 3.4 to 2.1a. The subgroup 2.1a isolates are closely related to the Paderborn and Lao isolates, whereas 2.1b isolates have a close relationship to the Chinese Guangxi isolates. The phylogenetic tree of 27 CSFV sequences based on the complete envelope glycoprotein gene (Erns-E2) displayed better resolution than that based on the complete open reading frame.
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Affiliation(s)
- C H Pan
- Department of Hog Cholera, Animal Health Research Institute, Council of Agriculture, Taipei, Taiwan
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12
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Shieh JJ, Liang CM, Chen CY, Lee F, Jong MH, Lai SS, Liang SM. Enhancement of the immunity to foot-and-mouth disease virus by DNA priming and protein boosting immunization. Vaccine 2001; 19:4002-10. [PMID: 11427276 DOI: 10.1016/s0264-410x(01)00114-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Subunit vaccination is effective in eliciting humoral responses to a variety of viral antigens, however, it has not generated persistent protective immunity to foot-and-mouth disease virus (FMDV). In this study, we observed that priming mice with a DNA plasmid encoding VP1 of the FMDV O/Taiwan/97 capsid protein followed by boosting with a VP1 peptide conjugate (P29-KLH) resulted in production of not only high titers of antibodies but also antibodies with FMDV neutralizing activities. Moreover, the mice immunized in this manner cleared the virus from their sera in FMDV challenge experiments. Mice subjected to DNA plasmid priming and P29-KLH protein boosting had relatively higher ratio of IgG2a/IgG1 than those primed and boosted with P29-KLH conjugate. Addition of an oligodeoxynucleotide (ODN) containing immunostimulatory cytosine-phosphate-guanosine (CpG) motifs to P29-KLH conjugate also induced a higher ratio of IgG2a/IgG1 and significantly higher titer of neutralizing antibodies. These results indicate that treating animals with DNA plasmids priming and FMDV antigen(s) boosting may elicit immunity to FMD and this immune response may be augmented by CpG ODN.
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Affiliation(s)
- J J Shieh
- Institute of Bioagricultural Sciences, Academia Sinica, Taipei, Taiwan
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13
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Li KC, Lai SS, Lam ST. Adequacy and pitfalls of G6PD deficiency counseling in Hong Kong. Southeast Asian J Trop Med Public Health 2001; 30 Suppl 2:79-83. [PMID: 11400793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Glucose-6-Phosphate-Dehydrogenase (G6PD) deficiency is common in Hong Kong with an incidence of 4.5% in male and 0.36% in female (Lo et al. 1996).The Neonatal Screening Unit of Clinical Genetic Service started its territory-wide neonatal screening program for G6PD deficiency and congenital hypothyroidism in 1984 (Lam et al, 1986). Because of insufficient manpower and resource, we have been giving health counseling on the phone to parents of G6PD deficient babies and then refer them to nearby maternal and child health centres for monitoring of jaundice. The disease, mode of inheritance, recurrence risk and the precaution against certain medicines (Chan 1996) and chemicals are explained. The purpose (Lam, 1994) is to reassure the parents that their G6PD deficient babies can be as normal as everyone and that they can have normal life. Nevertheless, it has not been established whether telephone counseling has any effect on the affected family in the form of psychological trauma (Marteau, 1989; Fyro, 1987; Li et al, 1996) or significant influence on the decision on future reproduction. This study tried to evaluate the service from the parents' point of view by 1) gathering information on parents' awareness and perception of G6PD deficiency, 2) determination of parents' attitude towards the telephone counseling, and 3) finding out the effect of G6PD deficiency on parents' decision on future reproduction. Over 300 parents were contacted by telephone, and were asked to respond to questions on a questionnaire . The telephone interview focused on parents' understanding of G6PD deficiency, their attitude towards this disease and the possible effect on future reproduction decision. Results showed that over 90% of cases that we had counseled attended the maternal and child health centres. Most of them accepted the presence of G6PD deficiency in their family which did not affect their decision on future pregnancy. Telephone counseling failed to establish a helping relationship with the parent as face to face counseling was more personal. The findings revealed that though telephone counseling had its shortcoming it served the target group effectively. Telephone counseling is still the method of choice for the G6PD deficiency counseling in this locality.
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Affiliation(s)
- K C Li
- Department of Health, 2/F Cheung Sha Wan Jockey Club Clinic, Kowloon, Hong Kong, China
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14
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Abstract
Copper-zinc superoxide dismutase (Cu/ZnSOD), a key enzyme in defense against toxic oxygen-free radicals, is widespread in eukaryotes and several species of gram-negative bacteria. The presence of this enzyme in Mycoplasma hyopneumoniae (M. hyopneumoniae), the primary pathogen of mycoplasmal pneumonia in pigs, was examined since the polyclonal antibody against bovine Cu/ZnSOD was dominantly cross-reactive with the M. hyopneumoniae Cu/ZnSOD from whole cellular proteins. In situ activity staining on SDS-PAGE showed that the molecular mass of M. hyopneumoniae Cu/ZnSOD in reducing form was approximately 17kDa. The presence of Cu and Zn ions at the active site of the enzyme was confirmed on the basis of inhibition by KCN and by H(2)O(2). The activity of M. hyopneumoniae Cu/ZnSOD on both SDS- and native-polyacrylamide gels was completely inhibited by 2mM KCN and the gels showed no iron-containing SOD (FeSOD) or manganese-containing SOD (MnSOD) in the crude extracts. The activity of M. hyopneumoniae Cu/ZnSOD in crude extract was 70units/mg protein and was 55% inhibited by 5mM KCN and 56% inactivated by 40mM H(2)O(2). This enzyme was growth-stage dependent and evidenced markedly higher production during the early log phase. Different expression levels of Cu/ZnSOD activity in field isolates were also detected. Taken together, the presence of Cu/ZnSOD in M. hyopneumoniae was identified for the first time.
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Affiliation(s)
- J R Chen
- Department of Pathobiology, Pig Research Institute Taiwan, National Taiwan University, 142 Chou-San Rd., Taipei, Taiwan
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15
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Abstract
This study identifies an adhesin-like glycoprotein, which was a 110 kDa protein (P110) under HPLC-GPC assay. This adhesin consisted of one P54 and two P28 subunits. In addition, N-glycosidase F could cleave all N-linked oligosaccharides on the P54 subunit. Experimental results indicated that P110 with native conformations significantly inhibited the adherence of biotin-labeled porcine tracheal epithelial cell extracts to the intact M. hyopneumoniae cells (p < 0.01). Furthermore, the biotin-labeled porcine tracheal epithelial cell extracts specifically bound to P54 and P28 subunits. This binding could be competitively inhibited by unlabeled porcine tracheal epithelial extracts and SPF porcine antisera against Mycoplasma hyopneumoniae. Both P54 and P28 subunits were constitutively expressed in different strains of M. hyopneumoniae. Their production was negligibly changed at various passages during in vitro cultivation. The significant role of this adhesin-like glycoprotein in the pathogenesis of swine pneumonia is under study.
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MESH Headings
- Adhesins, Bacterial/chemistry
- Adhesins, Bacterial/immunology
- Amidohydrolases/chemistry
- Animals
- Antibodies, Bacterial/immunology
- Antibodies, Monoclonal
- Binding, Competitive/immunology
- Blotting, Western/veterinary
- Chromatography, Affinity/veterinary
- Chromatography, Gel/veterinary
- Chromatography, High Pressure Liquid/veterinary
- Electrophoresis, Polyacrylamide Gel
- Enzyme-Linked Immunosorbent Assay/veterinary
- Glycoproteins/chemistry
- Glycoproteins/immunology
- Immune Adherence Reaction/veterinary
- Mice
- Molecular Weight
- Mycoplasma/chemistry
- Mycoplasma/immunology
- Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase
- Pneumonia of Swine, Mycoplasmal/immunology
- Pneumonia of Swine, Mycoplasmal/veterinary
- Rabbits
- Specific Pathogen-Free Organisms
- Swine
- Swine Diseases/immunology
- Trachea/immunology
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Affiliation(s)
- J R Chen
- Department of Pathobiology, Pig Research Institute Taiwan, Chunan, Miaoli, Taiwan
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16
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Shiu JS, Liu ST, Chang TJ, Ho WC, Lai SS, Chang YS. The presence of RNA splicing signals in the cDNA construct of the E2 gene of classical swine fever virus affected its expression. J Virol Methods 1997; 69:223-30. [PMID: 9504767 DOI: 10.1016/s0166-0934(97)00160-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
E2 is the major neutralizing antigen for classical swine fever virus (CSFV) infection. Previously, we have cloned and sequenced the E2 cDNA of Taiwan strain p97 by the reverse transcription-polymerase chain reaction (RT-PCR) method from CSFV-infected tissue. The presence of RNA splicing donor and acceptor sites were found in the cDNA sequence. In this study, transfection of E2 cDNA into mammalian cells resulted in the production of a spliced RNA. Site-directed mutagenesis of the donor and acceptor sites prevented the RNA splicing event and generated a full length transcript in COS7 cells. Although the spliced E2 transcript has not been reported in natural infection of CSFV, this study suggested that the potential splicing sites affected the E2 gene expression when the plasmid-based E2 gene was introduced into mammalian cells.
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Affiliation(s)
- J S Shiu
- Graduate Institute of Basic Science, Chang-Gung University School of Medicine, Taoyuan, Taiwan
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17
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De Santes KB, Lai SS, Cowan MJ. Haploidentical bone marrow transplants for two patients with reticular dysgenesis. Bone Marrow Transplant 1996; 17:1171-3. [PMID: 8807131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We report two cases of reticular dysgenesis (RD) successfully treated by BMT utilizing T cell-depleted haploidentical marrow grafts. One child failed to engraft after conditioning with ATG, and the other failed two transplant attempts with cyclophosphamide + ATG, and busulfan + cyclophosphamide + ATG, respectively. Donor engraftment was achieved in both patients following treatment with 700 cGy TBI, with or without other agents. These results, taken together with previous reports in the literature, suggest that children with RD may require more intensive conditioning than patients with other types of severe combined immunodeficiency syndrome.
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Affiliation(s)
- K B De Santes
- Department of Pediatrics, University of California, San Francisco 94143-1278, USA
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18
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Shiu JS, Chang MH, Liu ST, Ho WC, Lai SS, Chang TJ, Chang YS. Molecular cloning and nucleotide sequence determination of three envelope genes of classical swine fever virus Taiwan isolate p97. Virus Res 1996; 41:173-8. [PMID: 8738176 DOI: 10.1016/0168-1702(96)01286-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A strain of classical swine fever virus (CSFV) has been isolated in Taiwan. The cDNA coding for three envelope glycoproteins E1, E2 and E3 were molecularly cloned from purified viral particles using the reverse transcription-polymerase chain reaction (RT-PCR) method and sequence-specific primers. The resulting PCR products (1113 bp for E1. 699 bp for E2 and 567 bp for E3) were cloned into the SmaI site of pUC19 and then subjected to DNA sequence analysis. Data showed that nucleotide sequence of the three envelope genes shared a 82-83% homology with the corresponding genes of three other strains (Alfort, Brescia and Weybridge). However, the homology of the deduced amino acid sequence was greater than 90% among the four strains. The potential asparagine-linked glycosylation sites for E1 (5 sites), E2 (7 sites) and E3 (2 sites) were conserved. This suggests that the Taiwan p97 strain is distinct from other three strains described. The variations may have implications for future vaccine development. The sequence has been submitted to GenBank. The accession numbers are U43924 and U03290.
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Affiliation(s)
- J S Shiu
- Graduate Institute of Basic Science, Chang-Gung College of Medicine and Technology, Taoyuan, Taiwan
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19
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Ro LH, Lai SS, Hwang WL, Chou HH, Huang JN, Chang EL, Yang HL. Cloning and expression of an antigenic domain of glycoprotein gE of pseudorabies virus in Escherichia coli and its use as antigen in diagnostic assays. Am J Vet Res 1995; 56:555-61. [PMID: 7661447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Use of a combination of an effective gE gene-deleted pseudorabies virus (PRV) vaccine with a companion diagnostic kit for PRV glycoprotein gE has proven successful in several pseudorabies-eradication programs. To produce a large quantity of functional gE protein for development of a PRV-gE diagnostic kit, an Escherichia coli expression system containing the distal region of the PRV-gE gene of a PRV strain CF was constructed. The expressed protein contained 134 amino acids of gE protein (amino acids 77-210) fused to a 19-amino acids tag containing 6 histidine residues. After induction, a truncated PRV-gE polypeptide of 18-kd was expressed to about 20% of the total E coli proteins. Results of immunoblot analysis indicated that this E coli-produced PRV-gE protein reacted specifically with serum from PRV-hyperimmunized pigs and from field PRV-infected pigs, but not with serum samples from specific-pathogen-free pigs or pigs inoculated with gE-deleted PRV vaccine. These data indicate that, although the recombinant gE protein is produced in E coli, it still retains the antigenicity of the viral gE glycoprotein. Comparison between the recombinant gE protein, using immunoblot analysis with a commercial gE ELISA containing natural PRV-gE protein, revealed comparable test performance. This finding indicated that recombinant gE protein produced by E coli can be used for development of a companion serologic assay for a PRV-gE gene-deleted vaccine.
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Affiliation(s)
- L H Ro
- Molecular Biology Division, Development Center for Biotechnology, Taipei, Taiwan, Republic of China
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20
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Liu ST, Li SN, Wang DC, Chang SF, Chiang SC, Ho WC, Chang YS, Lai SS. Rapid detection of hog cholera virus in tissues by the polymerase chain reaction. J Virol Methods 1991; 35:227-36. [PMID: 1816255 DOI: 10.1016/0166-0934(91)90138-p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A rapid method for the detection of hog cholera virus (HCV) in infected tissues, using polymerase chain reaction (PCR) was developed. Total RNA isolated from HCV-infected tissues was reverse transcribed with AMV reverse transcriptase and the resulting complementary DNA was amplified by Taq DNA polymerase in the presence of two HCV-specific primers. The amplified DNA fragment was detected by agarose gel electrophoresis. The sensitivity of this method was at 10(4) TCID50 of HCV. The sensitivity increased approximately 1000-fold when the DNA was reamplified with a set of nested primers. DNA sequencing analysis of the PCR products revealed that the HCV sequence amplified from a local field isolate was highly homologous to the HCV Alfort strain. This method may be useful for pathological and epidemiological studies of HCV in pigs.
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Affiliation(s)
- S T Liu
- Department of Microbiology and Immunology, Chang-Gung Medical College, Taoyuan, Taiwan, R.O.C
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21
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Lin DS, Lai SS, Bowman DD, Jacobson RH, Barr MC, Giovengo SL. Feline immunodeficiency virus, feline leukaemia virus, Toxoplasma gondii, and intestinal parasitic infections in Taiwanese cats. Br Vet J 1990; 146:468-75. [PMID: 2171713 DOI: 10.1016/0007-1935(90)90037-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A population consisting of 70 breeder cats, 43 clinical cases, and 16 feral cats was examined for the presence of Toxoplasma gondii, feline immunodeficiency virus (FIV), and feline leukaemia virus (FeLV). No oocysts of T. gondii were observed in 96 faecal samples; faecal samples were not available from the feral cats. Other intestinal parasites identified included Isospora felis (three cats), Isospora rivolta (five), Dipylidium canium (two), Toxocara cati (four), Toxascaris leonina (one), and Ancylostoma sp. (two). Using a kinetics-based enzyme-linked immunosorbent assay on 117 sera including all the feral cats, nine had antibody to T. gondii antigen, three for antigens to FIV, and seven to the p27 antigen of FeLV. Of the nine cats with antibody to T. gondii, only one was also infected with FIV.
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Affiliation(s)
- D S Lin
- Department of Veterinary Microbiology, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853
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22
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Chomyn A, Lai SS. cDNA of the 24 kDa subunit of the bovine respiratory chain NADH dehydrogenase: high sequence conservation in mammals and tissue-specific and growth-dependent expression. Curr Genet 1989; 16:117-26. [PMID: 2598272 DOI: 10.1007/bf00393404] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We have isolated and sequenced several overlapping cDNA clones from a bovine lambda gt10 library which encode all but the first five amino acids of the entire mature 24 kDa subunit of NADH:ubiquinone oxidoreductase (EC 1.6.99.3), the first enzyme of the respiratory chain. The derived amino acid sequence agrees with that determined by direct sequencing of the purified protein, filling in a gap in the published sequence. A comparison of the nucleotide and amino acid sequences of the bovine 24 kDa subunit with those recently determined for the rat homologue has shown that this nuclear-encoded subunit of an OX-PHOS complex has diverged in these two species much less than the mitochondrial DNA-encoded subunits of the same enzyme complex, and also less than a set of available non-mitochondrial nuclear DNA-coded proteins. The sequence analysis of the clones has revealed the expression in the brain of two mRNAs differing in the length of the 3'-untranslated region. Furthermore, two polyadenylated RNA species, 930 and 1080 nucleotides in length, probably corresponding to the above mRNAs, have been detected in bovine brain and other tissues by RNA gel blot hybridization. The level of expression of the 24kDa subunit gene varies by more than an order of magnitude among different tissues. A cross-hybridizing mRNA species of 930 nucleotides has also been observed in HeLa cells and found to be strongly growth regulated.
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Affiliation(s)
- A Chomyn
- Division of Biology, California Institute of Technology, Pasadena 91125
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23
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Yang C, Wang JT, Wu FM, Lai SS. [Effect of dexamethasone-A synthetic glucocorticoid hormone on the immune response in pigs]. Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1986; 19:160-7. [PMID: 3545702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
These experiments were designed to study the effects of a synthetic drug--dexamethasone (DEX) on the immune response of weaned pigs against viral antigen (hog cholera vaccine) and bacterial antigen (formalin inactivated Salmonella enteritis vaccine). Twenty-three five-week-old pigs were divided into eight groups, six of which were injected twice daily with DEX at 1.0 mg or 0.1 mg per Kg of body weight for either four or five days. The other two groups served as controls. During this period, the two 0.1 mg/Kg DEX-treated groups were injected with live hog cholera vaccine at 1.0 or 0.1 dosage respectively. This same treatment was applied to the two 1.0 mg/Kg DEX-treated groups. One control group was injected with a dose of hog cholera vaccine, while the other was given 1.0 ml of Sal. enteritis vaccine. The hog cholera antibody response in DEX-treated pigs was significantly suppressed (p less than 0.01). However, consistent levels of antibody titers were maintained, indicating a slight antibody production. But in pigs injected with one tenth of the normal dose of hog cholera vaccine, there was little or no immune response (p less than 0.01). A comparison of the response of pigs given different levels of DEX concentrations to those with different doses of hog cholera vaccine showed that dexamethasone significantly suppressed antibody production when antigen concentrations were lower. Significant suppression of agglutinating antibody in response to bacterial antigen was also observed at 14 days post-vaccination (p less than 0.05).
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24
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Lai SS. Influence of infectivity of transmissible gastroenteritis virus of swine by pancreatin and some unknown factors. Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1983; 16:198-206. [PMID: 6094119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The infectivity of virulent strain, not attenuated strain, of transmissible gastroenteritis virus (TGEV) of swine could be enhanced as much as 50-fold by pancreatin incorporated medium. The mechanism(s) of enhancement was uncertained. Multiplication of TGEV, either virulent or attenuated strain, was inhibited by intestinal fluid of both TGEV infected and noninfected piglets. Pelleting virus particles from intestine fluid was likely to remove all inhibitors and resulted in facilitating the isolation of the virus by using swine testicle (ST) cell line. These findings contribute to the practical application in the isolation and identification of TGEV and in the preparation of high titred virus stocks.
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25
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Lai SS, Breese SS, Moore DM, Gillespie JH. Comparison of proliferation and cytopathogenicity of swine vesicular virus and coxsackievirus B5. Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1981; 14:167-72. [PMID: 6269809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Sequential appearance of both swine vesicular disease virus and Coxsackievirus B5 antigens in a pig kidney cell line was studied by immunofluorescence and electron microscopy. The replication cycle of each virus was approximately 3-4 h. Viral antigens were demonstrable in the cytoplasm 2 h after inoculation. A compact mass of fluorescence was seen when cells showed cytopathogenic effect at 5.5 h. After 3 h, a few viral particles, seen by electron microscopy, were in the cytoplasm. Morphological changes of cells occurred at the same time. Cytoplasmic crystalline arrays of virus were first detected at 7 h.
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Lai SS, McKercher PD, Moore DM, Gillespie JH. Pathogenesis of swine vesicular disease in pigs. Am J Vet Res 1979; 40:463-8. [PMID: 229744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Pigs exposed to swine vesicular disease virus developed vesicular lesions by postinoculation day 2. Lesions first appeared on the coronary band and then on the dewclaw, tongue, snout, lips, and bulbs of the heels. The onset of viremia coincided with febrile response and the appearance of vesicles. Virus was isolated from the nasal discharge, esophageal-pharyngeal fluid, and feces as early as postinoculation day 1. Greater amounts of virus were isolated from samples collected during the first week of infection, and lesser amounts from samples collected during the second week. The appearance and the distribution of specific fluorescence in various tissues indicated that during the development of swine vesicular disease virus infection, the epithelial tissues were initially involved, followed by a generalized infection of lymph tissues, and subsequently, a primary viremia. Seroconversion was detectable as early as postinoculation day 4. A mild nonsuppurative meningoencephalomyelitis throughout the CNS was observed in both inoculated and contact-exposed pigs. The olfactory bulbs were most severely and were frequently affected, particularly in contact pigs. The most severe brain lesions were found in pigs 3 to 4 days after the onset of viremia; contact pigs showed more severe brain lesions than inoculated pigs. Microscopic changes were also found in the coronary band, snout, tongue, and heart.
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Lai SS, Roberts AW, Carter GR, Jersey G. Biological characteristics and viral susceptibility of a rat embryonic skin cell line (RESI). Am J Vet Res 1974; 35:97-102. [PMID: 4358594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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