Subject Code:C12With the support by the National Natural Science Foundation of China,the group led by Prof.Shen Qin(沈沁)from the Center for Stem Cell Biology and Regenerative Medicine,School of Medicine,and the IDG/M...Subject Code:C12With the support by the National Natural Science Foundation of China,the group led by Prof.Shen Qin(沈沁)from the Center for Stem Cell Biology and Regenerative Medicine,School of Medicine,and the IDG/McGovern Institute for Brain Research at Tsinghua University,reported a newly discovered展开更多
用流式细胞仪测定晚期糖基化终末产物(advanced glycation end products,AGEs)刺激及N-乙酰半胱氨酸(NAC)干预前后小鼠心脏微血管内皮细胞血管细胞黏附分子1(VCAM-1)的表达,同时用放免法测定培养上清中TNF—α水平。结果发现AGEs刺激后...用流式细胞仪测定晚期糖基化终末产物(advanced glycation end products,AGEs)刺激及N-乙酰半胱氨酸(NAC)干预前后小鼠心脏微血管内皮细胞血管细胞黏附分子1(VCAM-1)的表达,同时用放免法测定培养上清中TNF—α水平。结果发现AGEs刺激后微血管内皮细胞VCAM-1表达增加,TNF—α水平升高;NAC干预组VCAM—1表达降低,TNF-α水平下降并具有剂量依赖性。提示NAC能抑制AGEs诱导的微血管内皮细胞VCAM-1的表达,TNF—α的介导是可能的机制之一。展开更多
This work was supported by grants from the National Natural Science Foundation of China.No. (39730420). ** To whom requests for reprints should be addressed.This is one of papers of the special issue on gene...This work was supported by grants from the National Natural Science Foundation of China.No. (39730420). ** To whom requests for reprints should be addressed.This is one of papers of the special issue on gene therapy research (Chin J Cancer Res Vol. 9 No. 4 December, 1997). Vascular cell adhesion molecule 1 (VCAM 1) is a member of immunoglobulin superfamily. The principal ligand for VCAM 1 is integrin α4β1/VLA 4 (very late antigen 4). It was reported that VCAM 1 was expressed on macrophages and dendritic cells, but little is known about its function on these professional antigen pre senting cells (APC). The present study was performed to investigate the expression of VCAM 1 on macrophages and the role of VCAM 1/VLA 4 in the activation of allogenic T cells by murine macrophages. We analyzed VCAM 1 expression on peritoneal macrophages and macrophage cell line J774A.1 by fluorescence activated cell sorting (FACS). Using neutralizing antibodies, we further analyzed the role of VCAM 1/VLA 4 interaction in macrophage and allogenic T cell mixed lymphocyte reaction (MLR). We found that VCAM 1 was consti tutively expressed on macrophages and its expression level was upregulated by soluble tumor associated antigen (freeze thaw lysates of FBL 3 leukemia cells) and TNF α. In MLR assays, we observed that blocking VCAM 1/VLA 4 interaction with anti VCAM 1 or anti VLA 4 mAbs caused significant inhibition of the proliferative response and IL 2 production. These results suggest that VCAM 1on macrophages not only facilitates the cell to cell contact through adhesive interaction but also plays a role in the costimulation of T cells via its interaction with VLA 4 on the T cells.展开更多
文摘Subject Code:C12With the support by the National Natural Science Foundation of China,the group led by Prof.Shen Qin(沈沁)from the Center for Stem Cell Biology and Regenerative Medicine,School of Medicine,and the IDG/McGovern Institute for Brain Research at Tsinghua University,reported a newly discovered
文摘用流式细胞仪测定晚期糖基化终末产物(advanced glycation end products,AGEs)刺激及N-乙酰半胱氨酸(NAC)干预前后小鼠心脏微血管内皮细胞血管细胞黏附分子1(VCAM-1)的表达,同时用放免法测定培养上清中TNF—α水平。结果发现AGEs刺激后微血管内皮细胞VCAM-1表达增加,TNF—α水平升高;NAC干预组VCAM—1表达降低,TNF-α水平下降并具有剂量依赖性。提示NAC能抑制AGEs诱导的微血管内皮细胞VCAM-1的表达,TNF—α的介导是可能的机制之一。
文摘This work was supported by grants from the National Natural Science Foundation of China.No. (39730420). ** To whom requests for reprints should be addressed.This is one of papers of the special issue on gene therapy research (Chin J Cancer Res Vol. 9 No. 4 December, 1997). Vascular cell adhesion molecule 1 (VCAM 1) is a member of immunoglobulin superfamily. The principal ligand for VCAM 1 is integrin α4β1/VLA 4 (very late antigen 4). It was reported that VCAM 1 was expressed on macrophages and dendritic cells, but little is known about its function on these professional antigen pre senting cells (APC). The present study was performed to investigate the expression of VCAM 1 on macrophages and the role of VCAM 1/VLA 4 in the activation of allogenic T cells by murine macrophages. We analyzed VCAM 1 expression on peritoneal macrophages and macrophage cell line J774A.1 by fluorescence activated cell sorting (FACS). Using neutralizing antibodies, we further analyzed the role of VCAM 1/VLA 4 interaction in macrophage and allogenic T cell mixed lymphocyte reaction (MLR). We found that VCAM 1 was consti tutively expressed on macrophages and its expression level was upregulated by soluble tumor associated antigen (freeze thaw lysates of FBL 3 leukemia cells) and TNF α. In MLR assays, we observed that blocking VCAM 1/VLA 4 interaction with anti VCAM 1 or anti VLA 4 mAbs caused significant inhibition of the proliferative response and IL 2 production. These results suggest that VCAM 1on macrophages not only facilitates the cell to cell contact through adhesive interaction but also plays a role in the costimulation of T cells via its interaction with VLA 4 on the T cells.
