G protein γ subunit 7 induces autophagy and inhibits cell division
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Juanjuan Liu1,2, Xinmiao Ji1, Zhiyuan Li1, Xingxing Yang1, Wenchao Wang1, Xin Zhang1
1High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui, 230031, P. R. China
2University of Science and Technology of China, Hefei, Anhui, 230036, P. R. China
Xin Zhang, e-mail: email@example.com
Keywords: GNG7 (G protein γ subunit 7), autophagy, cell death, cell division, actin
Received: January 13, 2016 Accepted: February 28, 2016 Published: April 02, 2016
GNG7 (G protein γ subunit 7), a subunit of heterotrimeric G protein, is ubiquitously expressed in multiple tissues but is down-regulated in various cancers. Its expression could reduce tumor volume in mice but the mechanism was not clear. Here we show that GNG7 overexpression inhibits cell proliferation and increases cell death. GNG7 level is cell cycle-dependent and it regulates actin cytoskeleton and cell division. In addition, GNG7 is an autophagy inducer, which is the first reported Gγ protein involved in autophagy. GNG7 knockdown reduces Rapamycin and starvation-induced autophagy. Further analysis reveals that GNG7 inhibits MTOR in cells, a central regulator for autophagy and cell proliferation. In conclusion, GNG7 inhibits MTOR pathway to induce autophagy and cell death, inhibits cell division by regulating actin cytoskeleton. These combined effects lead to the antitumor capacity of GNG7.
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