Cellular immune response is a major barrier to xenotransplantation. Human tumor necrosis factor-α (hTNF-α) possesses cross-species activity and directly amplifies the immune rejection via the upregulation of adhesio...Cellular immune response is a major barrier to xenotransplantation. Human tumor necrosis factor-α (hTNF-α) possesses cross-species activity and directly amplifies the immune rejection via the upregulation of adhesion molecules on porcine endothelium. We investigated the role of protein tyrosine phosphorylation in the induction of expression of E-selectin and vascular cell adhesion molecule-1 (VCAM-1), and the augmentation of adhesion of human peripheral blood monocytes (PBMo) and natural killer cells (PBNK), after rhTNF-α-stimulation of porcine aortic endo-thelial cells (PAEC) in vitro. rhTNF-α-increased adhesiveness of PAEC for both PBMo and PBNK was dose-dependently reduced by pretreatment of PAEC with the selective protein tyrosine kinase (PTK) inhibitor genistein. The inhibitory effect occurred at the early time of PAEC activation triggered by rhTNF-α, and was completely reversible. PTK activity assay indicated that genistein also suppressed rhTNF-α stimulated activation of protein tyrosine展开更多
目的:了解各种临床类型乙型肝炎患者外周血细胞的促凝血活性(PCA)及新型促凝血因子人纤维介素(human fibrinogen like protein 2,hfgl2)的表达情况,及其与疾病进展的关系。方法:病毒性乙型肝炎慢性重型25例,健康对照25例,分离外周血单...目的:了解各种临床类型乙型肝炎患者外周血细胞的促凝血活性(PCA)及新型促凝血因子人纤维介素(human fibrinogen like protein 2,hfgl2)的表达情况,及其与疾病进展的关系。方法:病毒性乙型肝炎慢性重型25例,健康对照25例,分离外周血单个核细胞(PBMC);病毒性乙型肝炎慢性重度和重型患者标本33例,病毒性乙型肝炎慢性轻度、中度共25例,健康对照25例分离其外周血白细胞(WBC)。用一期冻融法测量其PCA。采用免疫组化的方法检测hfgl2的表达。结果:病毒性乙型肝炎慢性重型患者PBMC的PCA较健康对照高出20倍。WBC的PCA在以下各组(健康对照组、病毒性乙型肝炎慢性轻中度组、病毒性乙型肝炎慢性重度和重型组)呈逐步上升过程,但组间差异无显著性意义。PCA在病毒性乙型肝炎慢性重型组患者PBMC中的表达显著高于其在WBC的表达。PCA在健康对照组PBMC和WBC的表达无显著差异,hfgl2在病毒性乙型肝炎慢性重型患者PBMC中的表达水平显著高于其在健康对照组中的表达。结论:病毒性乙型肝炎慢性重型患者PBMC中的PCA和hfgl2表达均显著升高,且其表达与疾病严重程度相关,hfgl2表达的强度(阳性细胞数)与PCA的升高呈正比相关。展开更多
基金This work was supported by the National Natural Science Foundation of China (Grant No. 39770700).
文摘Cellular immune response is a major barrier to xenotransplantation. Human tumor necrosis factor-α (hTNF-α) possesses cross-species activity and directly amplifies the immune rejection via the upregulation of adhesion molecules on porcine endothelium. We investigated the role of protein tyrosine phosphorylation in the induction of expression of E-selectin and vascular cell adhesion molecule-1 (VCAM-1), and the augmentation of adhesion of human peripheral blood monocytes (PBMo) and natural killer cells (PBNK), after rhTNF-α-stimulation of porcine aortic endo-thelial cells (PAEC) in vitro. rhTNF-α-increased adhesiveness of PAEC for both PBMo and PBNK was dose-dependently reduced by pretreatment of PAEC with the selective protein tyrosine kinase (PTK) inhibitor genistein. The inhibitory effect occurred at the early time of PAEC activation triggered by rhTNF-α, and was completely reversible. PTK activity assay indicated that genistein also suppressed rhTNF-α stimulated activation of protein tyrosine
文摘目的:了解各种临床类型乙型肝炎患者外周血细胞的促凝血活性(PCA)及新型促凝血因子人纤维介素(human fibrinogen like protein 2,hfgl2)的表达情况,及其与疾病进展的关系。方法:病毒性乙型肝炎慢性重型25例,健康对照25例,分离外周血单个核细胞(PBMC);病毒性乙型肝炎慢性重度和重型患者标本33例,病毒性乙型肝炎慢性轻度、中度共25例,健康对照25例分离其外周血白细胞(WBC)。用一期冻融法测量其PCA。采用免疫组化的方法检测hfgl2的表达。结果:病毒性乙型肝炎慢性重型患者PBMC的PCA较健康对照高出20倍。WBC的PCA在以下各组(健康对照组、病毒性乙型肝炎慢性轻中度组、病毒性乙型肝炎慢性重度和重型组)呈逐步上升过程,但组间差异无显著性意义。PCA在病毒性乙型肝炎慢性重型组患者PBMC中的表达显著高于其在WBC的表达。PCA在健康对照组PBMC和WBC的表达无显著差异,hfgl2在病毒性乙型肝炎慢性重型患者PBMC中的表达水平显著高于其在健康对照组中的表达。结论:病毒性乙型肝炎慢性重型患者PBMC中的PCA和hfgl2表达均显著升高,且其表达与疾病严重程度相关,hfgl2表达的强度(阳性细胞数)与PCA的升高呈正比相关。
