阻断Sonic Hedgehog信号对不同人肝癌细胞生长的影响

 目的: 研究阻断Sonic Hedgehog (Shh)信号对不同人肝癌细胞生长的影响,探讨阻断Shh信号抑制肝癌细胞生长的机制。方法: RT-PCR法检测Shh信号分子在3株人肝癌细胞(BEL-7402、Huh7和HepG2)中的表达,并检测Shh阻断抗体作用后BEL-7402细胞Shh信号效应分子表达变化;MTT法检测人肝癌细胞增殖活性;流式细胞术检测人肝癌细胞凋亡;Western blot 检测凋亡相关蛋白表达。结果: Shh信号分子在3株人肝癌细胞中均有表达,Shh阻断抗体可以下调Shh信号效应分子patched (Ptch)、Gli1和Gli2的表达;Shh阻断抗体可以抑制3株肝癌细胞生长,增加G₀/G₁期细胞,并诱导细胞凋亡;Shh阻断抗体作用后,BEL-7402细胞pro-caspase-3、pro-caspase-8和pro-caspase-9蛋白表达水平下降,cleaved caspase-3、cleaved caspase-8和cleaved caspase-9蛋白表达水平升高。结论: 阻断Shh信号可抑制Shh高表达的人肝癌细胞生长,阻滞细胞周期于G₀/G₁期,并诱导肝癌细胞凋亡。

Effect of Sonic Hedgehog signaling blockade on growth of hepatocarcinoma cells

AIM: To investigate the effect of Sonic Hedgehog (Shh) signaling blockade on the growth of hematocarcinoma cells and underlying mechanisms. METHODS: The expression of Shh signaling molecules in hematocarcinoma cell lines BEL-7402, Huh7 and HepG2 was detected by RT-PCR. The cell viability was detected by MTT assay. The cell cycle and apoptosis were analyzed by flow cytometry. The expression of apoptosis-related proteins was determined by Western blot. RESULTS: Shh signaling molecules were all expressed in BEL-7402, Huh7 and HepG2 cells. The mRNA expression of Patched (Ptch), Gli1 and Gli2 was down-regulated by anti-Shh antibody. Blockade of Shh signaling pathway inhibited the proliferation of hepatocarcinoma cells with increasing cells in G₀/G₁ phase and induced the apoptosis of hepatocarcinoma cells. Treatment with anti-Shh antibody down-regulated the protein expression of pro-caspase-3, pro-caspase-8 and pro-caspase-9, while up-regulated the protein levels of cleaved caspase-3, cleaved caspase-8 and cleaved caspase-9 in BEL-7402 cells. CONCLUSION: Blockade of Shh signaling pathway inhibits the growth of hepatocarcinoma at different levels by cell cycle arrest and inducing apoptosis of hematocarcinoma cells.