OSI-027 通过抑制 P-gp 诱导来减轻胃癌细胞中奥沙利铂的化学抗性

Title:OSI-027 Alleviates Oxaliplatin Chemoresistance in Gastric Cancer Cells by Suppressing P-gp Induction

Volume: 21 Issue: 10

关键词: 胃癌，OSI-027，奥沙利铂，mTOR，P-gp，多药耐药。

摘要: Gastric cancer is one of the most common malignancies worldwide and the third leading cause of cancer-related death. In the present study, we investigated the potential activity of OSI-027, a potent and selective mammalian target of rapamycin complex 1/2 (mTOR1/2) dual inhibitor, alone or in combination with oxaliplatin against gastric cancer cells in vitro. Cell counting kit-8 assays and EdU staining were performed to examine the proliferation of cancer cells. Cell cycle and apoptosis were detected by flow cytometry. Western blot was used to detect the elements of the mTOR pathway and P-gp in gastric cancer cell lines. OSI-027 inhibited the proliferation of MKN-45 and AGS cells by arresting the cell cycle in the G0/G1 phase. At the molecular level, OSI-027 simultaneously blocked mTORC1 and mTORC2 activation, and resulted in the downregulation of phosphor-Akt, phpspho-p70S6k, phosphor-4EBP1, cyclin D1, and cyclin-dependent kinase4 (CDK4). Additionally, OSI-027 also downregulated P-gp, which enhanced oxaliplatin-induced apoptosis and suppressed multidrug resistance. Moreover, OSI-027 exhibited synergistic cytotoxic effects with oxaliplatin in vitro, while a P-gp siRNA knockdown significantly inhibited the synergistic effect. In summary, our results suggest that dual mTORC1/mTORC2 inhibitors (e.g., OSI-027) should be further investigated as a potentially valuable treatment for gastric cancer.

Cite this article as:

OSI-027 Alleviates Oxaliplatin Chemoresistance in Gastric Cancer Cells by Suppressing P-gp Induction, Current Molecular Medicine 2021; 21 (10) . https://dx.doi.org/10.2174/1566524020666201120113538