• Ki Cheong Park, Jung Min Kim, Sang Yong Kim, Seok-Mo Kim, Jin Hong Lim, Min Ki Kim, Sungsoon Fang, Yonjung Kim, Gordon B Mills, Sung Hoon Noh, and Jae-Ho Cheong.
• Department of Surgery, Systems Cancer Biology & Biomarker Research Lab, Yonsei University College of Medicine, Seoul, Republic of Korea.
• Bmc Med. 2023 Feb 1; 21 (1): 3838.

BackgroundCancer cells have developed molecular strategies to cope with evolutionary stressors in the dynamic tumor microenvironment. Peroxisome proliferator-activated receptor-γ coactivator-1α (PGC1α) is a metabolic rheostat that regulates diverse cellular adaptive behaviors, including growth and survival. However, the mechanistic role of PGC1α in regulating cancer cell viability under metabolic and genotoxic stress remains elusive.MethodsWe investigated the PGC1α-mediated survival mechanisms in metabolic stress (i.e., glucose deprivation-induced metabolic stress condition)-resistant cancer cells. We established glucose deprivation-induced metabolic stress-resistant cells (selected cells) from parental tumor cells and silenced or overexpressed PGC1α in selected and parental tumor cells.ResultsSeveral in vitro and in vivo mouse experiments were conducted to elucidate the contribution of PGC1α to cell viability in metabolic stress conditions. Interestingly, in the mouse xenograft model of patient-derived drug-resistant cancer cells, each group treated with an anti-cancer drug alone showed no drastic effects, whereas a group that was co-administered an anti-cancer drug and a specific PMCA inhibitor (caloxin or candidate 13) showed marked tumor shrinkage.ConclusionsOur results suggest that PGC1α is a key regulator of anti-apoptosis in metabolic and genotoxic stress-resistant cells, inducing PMCA expression and allowing survival in glucose-deprived conditions. We have discovered a novel therapeutic target candidate that could be employed for the treatment of patients with refractory cancers.© 2023. The Author(s).

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