目的通过研究维生素D受体(vitamin D receptor,VDR)和钙敏感受体(calciumsensingreceptor,CaSR)在继发性甲状旁腺功能亢进症(Secondary hyperparathyroidism,SHPT)患者甲状旁腺组织中的表达,探讨VDR和CaSR与SHPT甲状旁腺组织病理改变的...目的通过研究维生素D受体(vitamin D receptor,VDR)和钙敏感受体(calciumsensingreceptor,CaSR)在继发性甲状旁腺功能亢进症(Secondary hyperparathyroidism,SHPT)患者甲状旁腺组织中的表达,探讨VDR和CaSR与SHPT甲状旁腺组织病理改变的关系。方法用免疫组化的方法计数CaSR和VDR阳性细胞,比较其在不同程度SHPT中甲状旁腺组织及正常甲状旁腺组织的阳性表达。结果 VDR阳性细胞表达几乎存在于所有主细胞的细胞核,呈黄褐色,胞膜和胞浆不着色。SHPT组较对照组明显下调,分别为(39.0±19.7)%和(78.0±2.5)%,差异有统计学意义(P<0.01)。SHPT弥漫性增生组、结节性增生组和腺瘤样增生组表达分别为57.1%、(31.0±6.7)%和(23.0±2.1)%,差异有统计学意义(P<0.01)。CaSR阳性细胞表达主要定位于主细胞的胞膜和胞浆,呈黄褐色。SHPT组较对照组明显下调,分别为(48.0±17.9)%和(79.0±1.0)%,差异有统计学意义(P<0.01)。弥漫性增生组、结节性增生组和腺瘤样增生组的CaSR表达分别为51.0%、(47.0±9.8)%和(29.0±10.1)%,差异有统计学意义(P<0.01)。结论 VDR和CaSR表达均随甲状旁腺组织增生的程度增高而下调。VDR和CaSR的表达下调可能是活性维生素D治疗无效的病理基础。上调VDR和CaSR表达水平以及进一步激活受体功能是内科治疗SHPT的研究方向。展开更多
In this experiment, expression of tissue-type plasminogen activator (t-PA) in smooth muscle cells (SMCs) was measured at different intervals after the arterial injury. In the normal iliac arteries, only low levels of ...In this experiment, expression of tissue-type plasminogen activator (t-PA) in smooth muscle cells (SMCs) was measured at different intervals after the arterial injury. In the normal iliac arteries, only low levels of t-PA activity were estimated. t-PA activity in extracts of the iliac arteries increased significantlyat the 4th day after the injury, equivalent to the process that SMCs migrated from the media to the intima,and the t-PA activity was then decreased approximately to the normal level at the 7th day. Coexistent to the above data, results from in situ hybridization showed that the expression of t-PA mRNA in the intima as well as media increased also significantly at the 4th day after the arterial injury, and at the 7th day, tPA mRNA was detected only in those SMCs locating closely adjacent to the internal elastic lamina. These results suggest that t-PA might play an important role in SMC migration following endothelial injury, andantagonism of t-PA expression and/or activity within the vessel wall might be helpful in intervening the de velopment of restenosis following angioplasty.展开更多
文摘In this experiment, expression of tissue-type plasminogen activator (t-PA) in smooth muscle cells (SMCs) was measured at different intervals after the arterial injury. In the normal iliac arteries, only low levels of t-PA activity were estimated. t-PA activity in extracts of the iliac arteries increased significantlyat the 4th day after the injury, equivalent to the process that SMCs migrated from the media to the intima,and the t-PA activity was then decreased approximately to the normal level at the 7th day. Coexistent to the above data, results from in situ hybridization showed that the expression of t-PA mRNA in the intima as well as media increased also significantly at the 4th day after the arterial injury, and at the 7th day, tPA mRNA was detected only in those SMCs locating closely adjacent to the internal elastic lamina. These results suggest that t-PA might play an important role in SMC migration following endothelial injury, andantagonism of t-PA expression and/or activity within the vessel wall might be helpful in intervening the de velopment of restenosis following angioplasty.
