Metformin Induces Human Esophageal Carcinoma Cell Pyroptosis by Targeting the miR-497/PELP1 Axis
Evasion of apoptosis is a major contributing factor to the development of chemo- and radiotherapy resistance. Therefore, activation of non-apoptotic programmed cell death (PCD) could be an effective alternative against apoptosis-resistant cancers. In this study, we demonstrated in vitro and in vivo that metformin can induce pyroptosis, a non-apoptotic PCD, in esophageal squamous cell carcinoma (ESCC), a commonly known chemo-refractory cancer, especially at its advanced stages. Proline-, glutamic acid- and leucine-rich protein-1 (PELP1) is a scaffolding oncogene and upregulated PELP1 in advanced stages of ESCC is highly associated with cancer progression and patient outcomes. Intriguingly, metformin treatment leads to gasdermin D (GSDMD)-mediated pyroptosis, which is abrogated by forced expression of PELP1. Mechanistically, metformin induces pyroptosis of ESCC by targeting miR-497/PELP1 axis. Our findings suggest that metformin and any other pyroptosis-inducing reagents could serve as alternative treatments for chemo- and radiotherapy refractory ESCC or other cancers sharing the same pyroptosis mechanisms.
Wang, Lu; Li, Kai; Lin, Xianjie; Yao, Zhimeng; Wang, Shuhong; Xiong, Xiao; Ning, Zhifeng; Wang, Jing; Xu, Xiaozheng; Jiang, Yi; Liu, Ditian; Chen, Yuping; Zhang, Dianzheng; and Zhang, Hao, "Metformin Induces Human Esophageal Carcinoma Cell Pyroptosis by Targeting the miR-497/PELP1 Axis" (2019). PCOM Scholarly Papers. 1976.