Stimulating TRPM7 suppresses cancer cell proliferation and metastasis by inhibiting autophagy. (28th January 2022)

• Record Type: Journal Article
• Authors: Xing, Yanhong; Wei, Xiangqing; Wang, Meng-meng; Liu, Yucheng; Sui, Zhongheng; Wang, Xinyan; Zhang, Yang; Fei, Yuan-hui; Jiang, Yi; Lu, Chen; Zhang, Peng; Chen, Rong; Liu, Nan; Wu, Mengmei; Ding, Lin; Wang, Yuqing; Guo, Feng; Cao, Jun-li; Qi, Jiansong; Wang, Wuyang
• Is Part Of: Cancer letters. Volume 525(2022)
• Page Start: 179
• Page End: 197
• Publication Date: 2022-01-28
• Subjects: TRPM7 -- Autophagic arrest -- Zinc homeostasis -- Tumorigenesis; Cancer -- Periodicals; Neoplasms -- Periodicals; Cancer -- Périodiques; Electronic journals; 616.994
• DOI: 10.1016/j.canlet.2021.10.043
• Languages: English
• ISSNs: 0304-3835

Abstract

Abstract: The transient receptor potential melastatin-subfamily member 7 (TRPM7) is a ubiquitous cation channel possessing kinase activity. TRPM7 mediates a variety of physiological responses by conducting flow of cations such as Ca 2+, Mg 2+, and Zn 2+ . Here, we show that the activation of TRPM7 channel stimulated by chemical agonists of TRPM7, Clozapine or Naltriben, inhibited autophagy via mediating Zn 2+ release to the cytosol, presumably from the intracellular Zn 2+ -accumulating vesicles where TRPM7 localizes. Zn 2+ release following the activation of TRPM7 disrupted the fusion between autophagosomes and lysosomes by disturbing the interaction between Sxt17 and VAMP8 which determines fusion status of autophagosomes and lysosomes. Ultimately, the disrupted fusion resulting from stimulation of TRPM7 channels arrested autophagy. Functionally, we demonstrate that the autophagy inhibition mediated by TRPM7 triggered cell death and suppressed metastasis of cancer cells in vitro, more importantly, restricted tumor growth and metastasis in vivo, by evoking apoptosis, cell cycle arrest, and reactive oxygen species (ROS) elevation. These findings represent a strategy for stimulating TRPM7 to combat cancer. Highlights: TRPM7-mediated zinc release to the cytosol inhibits autophagic flux in various cancer cell lines. TRPM7-mediated autophagy inhibition suppresses growth and metastasis of various cancer cells both in vitro and in vivo. TRPM7 exhibits potent anti-neoplastic functions and could be a potential target for cancer therapeutics.