Omeprazole suppresses aggressive cancer growth and metastasis in mice through promoting Snail degradation.

Abstract

Omeprazole is a proton pump inhibitor that has recently been reported to exhibit anticancer activity against several types of cancer. However, the anticancer mechanisms of omeprazole remain elusive. Snail is an oncogenic zinc finger transcription factor; aberrant activation of Snail is associated with the occurrence and progression of cancer. In this study, we investigated whether Snail acted as a direct anticancer target of omeprazole. We showed that omeprazole displayed a high binding-affinity to recombinant Snail protein (Kd = 0.076 mM), suggesting that omeprazole directly and physically binds to the Snail protein. We further revealed that omeprazole disrupted CREB-binding protein (CBP)/p300-mediated Snail acetylation and then promoted Snail degradation through the ubiquitin-proteasome pathway in HCT116 cells. Omeprazole treatment markedly suppressed Snail-driven epithelial-mesenchymal transition (EMT) in aggressive HCT116, SUM159, and 4T1 cancer cells in vitro and reduced EMT-associated tumor invasion and metastasis in cancer cell xenograft models. Omeprazole also inhibited tumor growth by limiting Snail-dependent cell cycle progression. Overall, this study, for the first time, identifies Snail as a target of omeprazole and reveals a novel mechanism underlying the therapeutic effects of omeprazole against cancer. This study strongly suggests that omeprazole may be an excellent auxiliary drug for treating patients with malignant tumors.

• Authors: Yang Li, Bo-Xue Ren, Hong-Mei Li, Tao Lu, Rong Fu, Zhao-Qiu Wu
• Journal: Acta pharmacologica Sinica (Acta Pharmacol Sin) Vol. 43 Issue 7 Pg. 1816-1828 (Jul 2022) ISSN: 1745-7254 [Electronic] United States
• PMID: 34785782 (Publication Type: Journal Article)
• Copyright: © 2021. The Author(s), under exclusive licence to CPS and SIMM.

Chemical References

• Snail Family Transcription Factors
• Transcription Factors
• Omeprazole

Topics

• Animals
• Cell Line, Tumor
• Cell Movement
• Epithelial-Mesenchymal Transition
• Humans
• Mice
• Neoplasm Metastasis (drug therapy, prevention & control)
• Omeprazole (pharmacology, therapeutic use)
• Snail Family Transcription Factors (metabolism)
• Transcription Factors (metabolism)