Ras-related tumorigenesis is suppressed by BNIP3-mediated autophagy through inhibition of cell proliferation

Shan Ying Wu, Sheng Hui Lan, Da En Cheng, Wei Kai Chen, Cheng Huang Shen, Ying Ray Lee, Roberto Zuchini, Hsiao Sheng Liu

研究成果: Article同行評審

58 引文 斯高帕斯(Scopus)


Autophagy plays diverse roles in Ras-related tumorigenesis. H-rasval12 induces autophagy through multiple signaling pathways including Raf-1/ERK pathway, and various ERK downstream molecules of autophagy have been reported. In this study, Bcl-2/adenovirus E1B 19-kDa-interacting protein 3 (BNIP3) is identified as a downstream transducer of the Ras/Raf/ERK signaling pathway to induce autophagy. BNIP3 was upregulated by H-rasval12 at the transcriptional level to compete with Beclin 1 for binding with Bcl-2. H-rasval12-induced autophagy suppresses cell proliferation demonstrated both in vitro and in vivo by expression of ectopic BNIP3, Atg5, or interference RNA of BNIP3 (siBNIP3) and Atg5 (shAtg5) using mouse NIH3T3 and embryo fibroblast cells. H-rasval12 induces different autophagic responses depending on the duration of Ras overexpression. After a short time (48 hours) of Ras overexpression, autophagy inhibits cell proliferation. In contrast, a longer time (2 weeks) of Ras overexpression, cell proliferation was enhanced by autophagy. Furthermore, overexpression of mutant Ras, BNIP3, and LC3-II was detected in bladder cancer T24 cells and the tumor parts of 75% of bladder cancer specimens indicating a positive correlation between autophagy and tumorigenesis. Taken together, our mouse model demonstrates a balance between BNIP3-mediated autophagy and H-rasval12-induced tumor formation and reveals that H-rasval12 induces autophagy in a BNIP3-dependent manner, and the threshold of autophagy plays a decisive role in H-rasval12-induced tumorigenesis. Our findings combined with others' reports suggest a new therapeutic strategy against Ras-related tumorigenesis by negative or positive regulation of autophagic activity, which is determined by the level of autophagy and tumor progression stages.

頁(從 - 到)1171-1182
出版狀態Published - 2011 12月

All Science Journal Classification (ASJC) codes

  • 癌症研究


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