AIM: To identify hepatitis C virus(HCV) core protein epitopes recognized by HLA-A2 restricted cytotoxic T lymphocyte (CTL). METHODS: Utilizing the method of computer prediction followed by a 4h(51)Cr release assay con...AIM: To identify hepatitis C virus(HCV) core protein epitopes recognized by HLA-A2 restricted cytotoxic T lymphocyte (CTL). METHODS: Utilizing the method of computer prediction followed by a 4h(51)Cr release assay confirmation. RESULTS: The results showed that peripheral blood mononuclear cells (PBMC) obtained from two HLA-A2 positive donors who were infected with HCV could lyse autologous target cells labeled with peptide "ALAHGVRAL (core 150-158)". The rates of specific lysis of the cells from the two donors were 37.5% and 15.8%, respectively. Blocking of the CTL response with anti-CD4 mAb caused no significant decrease of the specific lysis. But blocking of CTL response with anti-CD8 mAb could abolish the lysis. CONCLUSION: The peptide (core 150-158) is the candidate epitope recognized by HLAA2 restricted CTL.展开更多
目的探讨海洋多糖多肽复合物对2型糖尿病大鼠糖耐量的影响。方法选取健康雄性SD大鼠10只作为正常组,另取65只采用高糖高脂饲料结合链脲佐菌素制备2型糖尿病大鼠模型。将造模成功的2型糖尿病大鼠随机分为模型组,罗格列酮组[2 mg/(kg·...目的探讨海洋多糖多肽复合物对2型糖尿病大鼠糖耐量的影响。方法选取健康雄性SD大鼠10只作为正常组,另取65只采用高糖高脂饲料结合链脲佐菌素制备2型糖尿病大鼠模型。将造模成功的2型糖尿病大鼠随机分为模型组,罗格列酮组[2 mg/(kg·d)],海洋多糖多肽复合物低[2.5 m L/(kg·d)]、中[5.0 m L/(kg·d)]、高剂量组[10.0 m L/(kg·d)],每组10只。给药4周后,观察各组大鼠体质量、肝指数、肾指数以及糖耐量水平。结果与正常组相比,模型组大鼠体质量从高糖高脂饲料造模第2周开始显著升高(P<0.05),与模型组相比,给药3周后,海洋多糖多肽复合物低剂量组体质量显著增加(P<0.05);给药4周后,海洋多糖多肽复合物低、中剂量组体质量显著增加(P均<0.05),海洋多糖多肽复合物各剂量组肝指数均显著降低(P均<0.05),低剂量、中剂量组肾指数显著降低(P均<0.05);在糖耐量实验中,海洋多糖多肽复合物各剂量组各时间点血糖值及AUC均显著降低(P均<0.05)。结论海洋多糖多肽复合物可明显改善2型糖尿病大鼠的糖耐量异常。展开更多
The phloem, located within the vascular system, is critical for delivery of nutrients and signaling molecules throughout the plant body. Although the morphological process and several factors regulating phloem differe...The phloem, located within the vascular system, is critical for delivery of nutrients and signaling molecules throughout the plant body. Although the morphological process and several factors regulating phloem differentiation have been reported, the molecular mechanism underlying its initiation remains largely unknown. Here, we report that the small peptide-coding gene, CLAVATA 3 (CLV3)/EMBEYO SURROUNDING REGION 25 (CLE25), the expression of which begins in provascular initial cells of 64-cell-staged embryos, and continues in sieve element-procambium stem cells and phloem lineage cells, during postembryonic root development, facilitates phloem initiation in Arabidopsis. Knockout of CLE25 led to delayed protophloem formation, and in situ expression of an antagonistic CLE25G6T peptide compromised the fate-determining periclinal division of the sieve element precursor cell and the continuity of the phloem in roots. In stems of CLE25G6T plants the phloem formation was also compromised, and procambial cells were over-accumulated. Genetic and biochemical analyses indicated that a complex, consisting of the CLE-RESISTANT RECEPTOR KINASE (CLERK) leucinerich repeat (LRR) receptor kinase and the CLV2 LRR receptor- like protein, is involved in perceiving the CLE25 peptide. Similar to CLE25, CLERK was also expressed during early embryogenesis. Taken together, our findings suggest that CLE25 regulates phloem initiation in Arabidopsis through a CLERK-CLV2 receptor complex.展开更多
基金the National Nature Science Foundation of China,No.39800121
文摘AIM: To identify hepatitis C virus(HCV) core protein epitopes recognized by HLA-A2 restricted cytotoxic T lymphocyte (CTL). METHODS: Utilizing the method of computer prediction followed by a 4h(51)Cr release assay confirmation. RESULTS: The results showed that peripheral blood mononuclear cells (PBMC) obtained from two HLA-A2 positive donors who were infected with HCV could lyse autologous target cells labeled with peptide "ALAHGVRAL (core 150-158)". The rates of specific lysis of the cells from the two donors were 37.5% and 15.8%, respectively. Blocking of the CTL response with anti-CD4 mAb caused no significant decrease of the specific lysis. But blocking of CTL response with anti-CD8 mAb could abolish the lysis. CONCLUSION: The peptide (core 150-158) is the candidate epitope recognized by HLAA2 restricted CTL.
文摘目的探讨海洋多糖多肽复合物对2型糖尿病大鼠糖耐量的影响。方法选取健康雄性SD大鼠10只作为正常组,另取65只采用高糖高脂饲料结合链脲佐菌素制备2型糖尿病大鼠模型。将造模成功的2型糖尿病大鼠随机分为模型组,罗格列酮组[2 mg/(kg·d)],海洋多糖多肽复合物低[2.5 m L/(kg·d)]、中[5.0 m L/(kg·d)]、高剂量组[10.0 m L/(kg·d)],每组10只。给药4周后,观察各组大鼠体质量、肝指数、肾指数以及糖耐量水平。结果与正常组相比,模型组大鼠体质量从高糖高脂饲料造模第2周开始显著升高(P<0.05),与模型组相比,给药3周后,海洋多糖多肽复合物低剂量组体质量显著增加(P<0.05);给药4周后,海洋多糖多肽复合物低、中剂量组体质量显著增加(P均<0.05),海洋多糖多肽复合物各剂量组肝指数均显著降低(P均<0.05),低剂量、中剂量组肾指数显著降低(P均<0.05);在糖耐量实验中,海洋多糖多肽复合物各剂量组各时间点血糖值及AUC均显著降低(P均<0.05)。结论海洋多糖多肽复合物可明显改善2型糖尿病大鼠的糖耐量异常。
基金provided by the Ministry of Science and Technology of China (2014CB943400)the National Natural Science Foundation of China (31370029+1 种基金 31871455)the Youth Innovation Promotion Association of the Chinese Academy of Sciences
文摘The phloem, located within the vascular system, is critical for delivery of nutrients and signaling molecules throughout the plant body. Although the morphological process and several factors regulating phloem differentiation have been reported, the molecular mechanism underlying its initiation remains largely unknown. Here, we report that the small peptide-coding gene, CLAVATA 3 (CLV3)/EMBEYO SURROUNDING REGION 25 (CLE25), the expression of which begins in provascular initial cells of 64-cell-staged embryos, and continues in sieve element-procambium stem cells and phloem lineage cells, during postembryonic root development, facilitates phloem initiation in Arabidopsis. Knockout of CLE25 led to delayed protophloem formation, and in situ expression of an antagonistic CLE25G6T peptide compromised the fate-determining periclinal division of the sieve element precursor cell and the continuity of the phloem in roots. In stems of CLE25G6T plants the phloem formation was also compromised, and procambial cells were over-accumulated. Genetic and biochemical analyses indicated that a complex, consisting of the CLE-RESISTANT RECEPTOR KINASE (CLERK) leucinerich repeat (LRR) receptor kinase and the CLV2 LRR receptor- like protein, is involved in perceiving the CLE25 peptide. Similar to CLE25, CLERK was also expressed during early embryogenesis. Taken together, our findings suggest that CLE25 regulates phloem initiation in Arabidopsis through a CLERK-CLV2 receptor complex.
