GMI, an Immunomodulatory Protein from Ganoderma microsporum, Potentiates Cisplatin-Induced Apoptosis via Autophagy in Lung Cancer Cells.

doi:10.1021/mp500840z

中山醫學大學機構典藏 CSMUIR > 醫學院 > 免疫學研究所 > 期刊論文 > Item 310902500/11749

Please use this identifier to cite or link to this item: https://ir.csmu.edu.tw:8080/ir/handle/310902500/11749

Title:	GMI, an Immunomodulatory Protein from Ganoderma microsporum, Potentiates Cisplatin-Induced Apoptosis via Autophagy in Lung Cancer Cells.
Authors:	Hsin, IL CC2, Ou MF1, Wu MS5, Jan YM7, Hsiao CH3, Lin Ko, JL
Contributors:	中山醫學大學
Keywords:	GMI;apoptosis;autophagy;caspase-7;cisplatin
Date:	2015
Issue Date:	2015-07-28T10:08:44Z (UTC)
ISSN:	1543-8384
Abstract:	Cisplatin-based therapy is common in the treatment of several types of cancers, including lung cancers. In our previous study, GMI, an immunomodulatory protein cloned from Ganoderma microsporum, induced a cytotoxic effect in lung cancer cells via autophagy. The aim of this study is to examine the role of GMI in enhancing cisplatin-mediated cell death. On the basis of MTT assay and Combination Index, GMI and cisplatin cotreatment induced a synergistic cytotoxic effect. GMI and cisplatin-induced apoptosis was determined by sub-G1, nuclear condensation, and annexin-V/propidium iodide analyses. On Western blot, expressions of γH2AX and cleaved forms of PARP, caspase-3, and caspase-7 were induced by combined treatment. Akt/mTOR pathway activity, LC3-II expression, and acidic vesicular organelle development demonstrated that cisplatin does not abolish GMI-mediated autophagy. Cyto-ID Green/hoechst 33342 double staining and time-dependent experiment indicated that GMI and cisplatin-treated A549 cells simultaneously express autophagosomes and apoptotic nuclei. To elucidate the role of autophagy in inducing apoptosis by GMI and cisplatin, chemical inhibitors and LC3 shRNA were used to inhibit autophagy. The results showed that 3-methyladenine decreases, while chloroquine increases GMI and cisplatin cotreatment-induced cleavage of caspase-7 and PARP. LC3 silencing abolished activation of apoptosis in A549 cells. Caspase inhibitors and caspase-7 silencing mitigated GMI and cisplatin-elicited cell viability inhibition and apoptosis. This is the first study to reveal the novel function of GMI in potentiating cisplatin-mediated apoptosis. GMI and cisplatin induce apoptosis via autophagy/caspase-7-dependent and survivin- and ERCC1-independent pathway. GMI may be a potential cisplatin adjuvant against lung cancer.
URI:	https://ir.csmu.edu.tw:8080/ir/handle/310902500/11749 http://dx.doi.org/10.1021/mp500840z
Relation:	Mol Pharm. 2015 May 4;12(5):1534-43.
Appears in Collections:	[免疫學研究所] 期刊論文

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