首页 > 文献资料
-
Necroptosis is characterized by programmed necrotic cell death and autophagic activation and might be involved in the death process of dopaminergic neurons in Parkinson’s disease. We hypothesized that necrostatin-1 could block necroptosis and give protection to dopaminergic neurons. There is likely to be crosstalk between necroptosis and other cell death pathways, such as apoptosis and autophagy. PC12 cells were pretreated with necroststin-1 1 hour before expo-sure to 6-hydroxydopamine. We examined cell viability, mitochondrial membrane potential and expression patterns of apoptotic and necroptotic death signaling proteins. The results showed that the autophagy/lysosomal pathway is involved in the 6-hydroxydopamine-induced death pro-cess of PC12 cells. Mitochondrial disability induced overactive autophagy, increased cathepsin B expression, and diminished Bcl-2 expression. Necrostatin-1 within a certain concentration range (5–30 μM) elevated the viability of PC12 cells, stabilized mitochondrial membrane potential, inhibited excessive autophagy, reduced the expression of LC3-II and cathepsin B, and increased Bcl-2 expression. These findings suggest that necrostatin-1 exerted a protective effect against injury on dopaminergic neurons. Necrostatin-1 interacts with the apoptosis signaling pathway during this process. This pathway could be a new neuroprotective and therapeutic target in Par-kinson’s disease.
-
高血压靶器官的细胞增生与凋亡
近年来,凋亡(apoptosis or programmed cell death)在心血管领域作为一个崭新的概念逐渐引起人们的重视,国内外学者就心血管系统在生理、病理情况下的细胞凋亡现象进行了卓有成效的探讨,不仅通过动物实验证实了在心肌缺血与再灌注、心肌肥厚、心力衰竭、心脏传导系统的发育以及心律失常的发生发展过程中细胞凋亡的存在或异常变化[1-8],而且在心脏移植患者中证实细胞凋亡确实参与了心力衰竭的发生与发展[9].