Cited by 47Cancer, Hypoxia, and MetabolismCell death mechanisms and regulationAmino Acid Enzymes and Metabolism

SHMT2 promotes cell viability and inhibits ROS-dependent, mitochondrial-mediated apoptosis via the intrinsic signaling pathway in bladder cancer cells

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Zhang, Yun, Liu, Zhe, Wang, Xueliang, Jian, Hui, Xiao, Haihan, Wen, Tingyi·2022·Cancer Gene Therapy

Abstract

Mitochondrial serine hydroxymethyltransferase (SHMT2) catalyzes the conversion of serine to glycine and concomitantly produces one-carbon units to support cell growth and is upregulated in various cancer cells. SHMT2 knockdown triggers cell apoptosis; however, the detailed mechanism of apoptosis induced by SHMT2 inactivation remains unknown. Here, we demonstrate that SHMT2 supports the proliferation of bladder cancer (BC) cells by maintaining redox homeostasis. SHMT2 knockout decreased the pools of purine and one-carbon units and delayed cell cycle progression in a manner that was rescued by formate, demonstrating that SHMT2-mediated one-carbon units are essential for BC cell proliferation. SHMT2 deficiency promoted the accumulation of intracellular reactive oxygen species (ROS) by decreasing the NADH/NAD + , NADPH/NADP + , and GSH/GSSG ratios, leading to a loss in mitochondrial membrane potential, release of cytochrome c , translocation of Bcl-2 family protein and activation of caspase-3. Notably, blocking ROS production with the one-carbon donor formate and the ROS scavenger N-acetyl-cysteine (NAC) effectively rescued SHMT2 deficiency-induced cell apoptosis via the intrinsic signaling pathway. Treatment with the SHMT inhibitor SHIN1 resulted in a significant inhibitory effect on cell proliferation and induced cell apoptosis. Formate and NAC rescued SHIN1-induced cell apoptosis. Our findings reveal an important mechanism by which the loss of SHMT2 triggers ROS-dependent, mitochondrial-mediated apoptosis, which gives insight into the link between serine metabolism and cell apoptosis and provides a promising target for BC treatment and drug discovery.

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Crossref · 10.1038/s41417-022-00470-5

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Authors
Zhang, Y., Liu, Z., Wang, X., Jian, H., Xiao, H., & Wen, T.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
Wen, Tingyi
Venue
Cancer Gene Therapy
Published
2022-04-14
Volume
29
Issue
10
Pages
1514-1527
ISSN
  • 0929-1903 (ISSN-L)
  • 1476-5500
OpenAlex
W4223927692
Cited by
47
References
56
Citations by year
2026: 10 · 2025: 16 · 2024: 9 · 2023: 9 · 2022: 3
FWCI
3.90
Type
journal article
Language
en
Open access
Locations
  • Cancer Gene Therapy (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
SHMT2, serine hydroxymethyltransferase, bladder cancer, apoptosis, reactive oxygen species, mitochondrial apoptosis, one-carbon metabolism, redox homeostasis, cell proliferation, serine metabolism, formate, N-acetylcysteine, cytochrome c release, Bcl-2 family proteins, caspase-3, mitochondrial membrane potential
MeSH terms
Urinary Bladder Neoplasms, Carbon, Cell Survival, Cysteine, Formates, Glycine, Humans, NAD, NADP, Serine, Glycine Hydroxymethyltransferase, Signal Transduction, Apoptosis, Reactive Oxygen Species, Proto-Oncogene Proteins c-bcl-2, Glutathione Disulfide, Cytochromes c, Cell Line, Tumor, Caspase 3

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