目的:分离纯化鉴定兔高迁移率非组蛋白N2(High mobility group chromosomal protein N2,HMGN2)。方法:利用液氮研磨和5%高氯酸从新鲜兔胸腺组织获得酸溶性萃取物,经反相高效液相色谱(RP-HPLC)分离得到HMGN2,经过SDS-聚丙烯酰胺凝胶电泳...目的:分离纯化鉴定兔高迁移率非组蛋白N2(High mobility group chromosomal protein N2,HMGN2)。方法:利用液氮研磨和5%高氯酸从新鲜兔胸腺组织获得酸溶性萃取物,经反相高效液相色谱(RP-HPLC)分离得到HMGN2,经过SDS-聚丙烯酰胺凝胶电泳和Western-blotting对HMGN2进行分子量测定和特异性鉴定。并利用琼脂糖弥散抑菌实验对其杀菌活性进行鉴定。结果:利用上述方法分离纯化出高纯度的兔HMGN2。对大肠埃希菌临床分离株54080、大肠埃希菌ATCC25922有明显杀菌活性。结论:建立简单分离高纯度的HMGN2的方法。展开更多
目的:我们先前的研究证明HMGN2(high mobility group nucleosomal-binding domain2)是人LAK细胞抗菌的一个新的效应分子,本研究欲检测其体外抗乙型肝炎病毒的活性。方法:应用反向高效液相色谱技术从人淋巴结组织酸溶性提取物中分离纯化...目的:我们先前的研究证明HMGN2(high mobility group nucleosomal-binding domain2)是人LAK细胞抗菌的一个新的效应分子,本研究欲检测其体外抗乙型肝炎病毒的活性。方法:应用反向高效液相色谱技术从人淋巴结组织酸溶性提取物中分离纯化批量HMGN2分子,用质谱精确分子量测定、Western blotting和抗菌试验对分离纯化得到的HMGN2分子进行分子鉴定。采用MTT法检测HMGN2分子对稳定转染复制型HBV重组质粒的肝胚瘤细胞株HepG2.2.15细胞的细胞毒性;用不同浓度HMGN2分子作用于HepG2.2.15细胞,分别在第3d和第6d收集细胞培养上清液,ELISA检测上清中HBV表面抗原(HBsAg)及e抗原(HBeAg),采用实时荧光定量PCR法检测上清液HBVDNA的含量。结果:从人淋巴结组织中分离纯化获得纯度较高的HMGN2蛋白;在检1-100mg/L范围内,HMGN2分子对HepG2.2.15细胞无细胞毒性;HMGN2分子在1-5mg/L水平即可显著抑制HBeAg和HBsAg的表达,可显著降低HBVDNA拷贝数。结论:HMGN2分子在体外具有较强的抗HBV活性。展开更多
Background: Adipose tissue-derived stem cells (ASC) possess the ability to differentiate into adipocytes or endothelial cells to help in the adipogenesis, vasculogenesis and vascular repair. This study aims at determi...Background: Adipose tissue-derived stem cells (ASC) possess the ability to differentiate into adipocytes or endothelial cells to help in the adipogenesis, vasculogenesis and vascular repair. This study aims at determining the impact of high-fat diets (HFD)-induced type 2 diabetes (T2D) on the differentiation potential of ASC. Results: C57BL/6J male mice were fed a vegetal (VD) or an animal (AD) HFD. Isolation of ACS from mice showing different levels of metabolic alterations reveals that advanced T2D did not affect the number of cells per gram of tissue. Rather, a higher proportion of inflammatory CD36+ cells was identified in HFD fed mice. Despite a marked decreased expression of adipogenic genes (aP2, C/EBPα and PPARγ2), ASC from HFD groups had a higher adipogenic potential and a lower endothelial differentiation potential in vitro compared to control. ASC from the VD group had enhanced cyclin B1 expression and had more adipogenic potential compared to AD group. Conclusion: Our results demonstrate that the metabolic modifications, linked to the nature of fatty acids in diets, modulate the differentiation potential of ASC with increased adipogenesis to the detriment of the endothelial pathway. Results highlight the importance of evaluating the ASC differentiation behavior in a context of autologous cell-based therapy for the repair of vascular tissues in diabetic patients.展开更多
HMGN2 have functions in inflammatory response.However,the role of HMGN2 in severe acute pancreatitis(SAP)remains unclear.Here,our study was to discuss the role and regulatory mechanism ofHMGN2 in SAP.In this study,the...HMGN2 have functions in inflammatory response.However,the role of HMGN2 in severe acute pancreatitis(SAP)remains unclear.Here,our study was to discuss the role and regulatory mechanism ofHMGN2 in SAP.In this study,the SAP cell model of AR42J was used to study the function and mechanism of HMGN2 in SAP.The protein expression in cells and serums were examined by western blot and ELISA assay.qPCR was used to test the transcriptional RNA level.Cell viability were examined by MTT assay.Luciferase assay was used to evaluate the interaction between gene and gene.Our results showed that HMGN2 was significantly upregulated in SAP patients.The database predicted and luciferase assay data indicated the HMGN2 was directly binding with miR-590-3p.ELISA,MTT and western blot experiments showed that the HMGN2 were promoted the cell proliferation,reduced the inflammation,and repressed the cell autophagy.Mechanism studies showed that the pseudogene HMGN2P46 level was positively correlated with HMGN2 and upregulated HMGN2 expression by competing for miR-590-3p in SAP.Taken together,all over these results showed upregulation of HMGN2 alleviates SAP,this process was regulated by HMGN2P46 competitively binding with miR-590-3p,which may provide a new insight for the treatment and intervention in SAP.Pseudogene HMGN2P46 was a miRNA sponge to regulate HMGN2 level by competing for miR-590-3p to alleviate the process of SAP.It provided a novel strategy for the diagnosis and treatment of severe acute pancreatitis.展开更多
文摘目的:分离纯化鉴定兔高迁移率非组蛋白N2(High mobility group chromosomal protein N2,HMGN2)。方法:利用液氮研磨和5%高氯酸从新鲜兔胸腺组织获得酸溶性萃取物,经反相高效液相色谱(RP-HPLC)分离得到HMGN2,经过SDS-聚丙烯酰胺凝胶电泳和Western-blotting对HMGN2进行分子量测定和特异性鉴定。并利用琼脂糖弥散抑菌实验对其杀菌活性进行鉴定。结果:利用上述方法分离纯化出高纯度的兔HMGN2。对大肠埃希菌临床分离株54080、大肠埃希菌ATCC25922有明显杀菌活性。结论:建立简单分离高纯度的HMGN2的方法。
基金This project was supported financially by grants from the Fondation des maladies du Coeur du Québec and from the Fondation de l’Institutde Cardiologie de Montréal to Dr Jean-Francois Tanguay.
文摘Background: Adipose tissue-derived stem cells (ASC) possess the ability to differentiate into adipocytes or endothelial cells to help in the adipogenesis, vasculogenesis and vascular repair. This study aims at determining the impact of high-fat diets (HFD)-induced type 2 diabetes (T2D) on the differentiation potential of ASC. Results: C57BL/6J male mice were fed a vegetal (VD) or an animal (AD) HFD. Isolation of ACS from mice showing different levels of metabolic alterations reveals that advanced T2D did not affect the number of cells per gram of tissue. Rather, a higher proportion of inflammatory CD36+ cells was identified in HFD fed mice. Despite a marked decreased expression of adipogenic genes (aP2, C/EBPα and PPARγ2), ASC from HFD groups had a higher adipogenic potential and a lower endothelial differentiation potential in vitro compared to control. ASC from the VD group had enhanced cyclin B1 expression and had more adipogenic potential compared to AD group. Conclusion: Our results demonstrate that the metabolic modifications, linked to the nature of fatty acids in diets, modulate the differentiation potential of ASC with increased adipogenesis to the detriment of the endothelial pathway. Results highlight the importance of evaluating the ASC differentiation behavior in a context of autologous cell-based therapy for the repair of vascular tissues in diabetic patients.
基金This work was supported by National Natural Science Foundation of China[81901957]China Postdoctoral Science Foundation[2018M633723].
文摘HMGN2 have functions in inflammatory response.However,the role of HMGN2 in severe acute pancreatitis(SAP)remains unclear.Here,our study was to discuss the role and regulatory mechanism ofHMGN2 in SAP.In this study,the SAP cell model of AR42J was used to study the function and mechanism of HMGN2 in SAP.The protein expression in cells and serums were examined by western blot and ELISA assay.qPCR was used to test the transcriptional RNA level.Cell viability were examined by MTT assay.Luciferase assay was used to evaluate the interaction between gene and gene.Our results showed that HMGN2 was significantly upregulated in SAP patients.The database predicted and luciferase assay data indicated the HMGN2 was directly binding with miR-590-3p.ELISA,MTT and western blot experiments showed that the HMGN2 were promoted the cell proliferation,reduced the inflammation,and repressed the cell autophagy.Mechanism studies showed that the pseudogene HMGN2P46 level was positively correlated with HMGN2 and upregulated HMGN2 expression by competing for miR-590-3p in SAP.Taken together,all over these results showed upregulation of HMGN2 alleviates SAP,this process was regulated by HMGN2P46 competitively binding with miR-590-3p,which may provide a new insight for the treatment and intervention in SAP.Pseudogene HMGN2P46 was a miRNA sponge to regulate HMGN2 level by competing for miR-590-3p to alleviate the process of SAP.It provided a novel strategy for the diagnosis and treatment of severe acute pancreatitis.
