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首页> 中文期刊> 《中国病理生理杂志》 >抑制SHARPIN激活Rip1促进LNCaP－AI细胞坏死性凋亡

抑制SHARPIN激活Rip1促进LNCaP－AI细胞坏死性凋亡

         
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[ ABSTRACT] AIM:To explore the role of SHARPIN in regulation of Rip1 in castration-resistant prostate cancer LNCaP-AI cells.METHODS:The LNCaP-AI cells were treated with TNF-α+Z-VAD ( an inhibitor of pan-caspase) to activate necroptosis, which were compared to the cells treated with TNF-α+Z-VAD+Nec-1 ( an inhibitor of Rip1 ) .A blank group and a TNF-α-treated group were set up as controls.The cell viability in each group was measured by MTS as-say.In addition, SHARPIN was knocked down by siRNA, and the inhibitory efficiency was evaluated by RT-qPCR.The expression of Rip1 at mRNA and protein levels after knocking down SHARPIN was determined by RT-qPCR and Western blot to explore the underlying mechanism of regulatory network of necroptosis in prostate cancer.RESULTS: Compared with blank control group and TNF-α-treated group, the viability of LNCaP-AI cells treated with TNF-α+Z-VAD decreased by 28%(P<0.05).After treated with TNF-α+Z-VAD+Nec-1, the LNCaP-AI cells showed no significant difference in the viability compared with blank control and TNF-α-treated groups.Taken together, necroptosis may be an important way of cell death in LNCaP-AI cells.Besides, the expression of Rip1 at protein level was up-regulated following the inhibition of SHARPIN using siRNA, indicating that down-regulation of SHARPIN enhanced necroptosis via activating Rip1 in LNCaP-AI cells.CONCLUSION:Necroptosis is an important way of cell death .Inhibition of oncogenic factor SHARPIN enhances necroptosis via activating Rip1 in LNCaP-AI cells.%目的：探讨SHARPIN对去势抵抗性前列腺癌细胞LNCaP－AI坏死性凋亡关键因子Rip1的调控作用，以及对细胞坏死性凋亡的影响。方法：将LNCaP－AI细胞分为TNF－α＋Z－VAD（ caspase抑制剂）处理组与TNF－α＋Z－VAD＋Nec－1（Rip1抑制剂）处理组，应用MTS检测各组细胞的活力，研究坏死性凋亡机制在诱导LNCaP－AI细胞死亡中的作用。将LNCaP－AI细胞分为阴性对照组和SHARPIN干扰（ si－SHARPIN）组，RT－qPCR验证抑制效率，通过免疫荧光等技术进一步探讨SHARPIN调控坏死性凋亡的具体分子机制。结果：与对照组相比，TNF－α＋Z－VAD处理组的LNCaP－AI细胞活力下降28％（P＜0．05），而TNF－α＋Z－VAD ＋Nec－1处理组的细胞在Rip1被抑制后，细胞活力无明显改变。在LNCaP－AI细胞中，通过siRNA抑制SHARPIN表达后，Rip1表达水平上调，同时， LNCaP－AI细胞坏死性凋亡比例升高。结论：LNCaP－AI细胞可通过坏死性凋亡机制诱导死亡，下调SHARPIN可能通过激活Rip1增强LNCaP－AI细胞坏死性凋亡。

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