Abstract
AZD8055 is an inhibitor of mammalian target of rapamycin (mTOR) that can suppress both mTOR complex 1 (mTORC1) and mTORC2. This study investigated the antitumor effects of AZD8055 on colon cancer. The effects of AZD8055 on proliferation, apoptosis, and cell cycle of colon cancer cells, and tumor growth in a mouse colon cancer model were studied. AZD8055 significantly inhibited proliferation and induced apoptosis of colon cancer cells (p<0.05). The phosphorylation of both AKT and S6 kinase 1 (S6K1) was suppressed by AZD8055. AZD8055 also induced G0/G1 cell-cycle arrest, reduced cyclin D1 and increased p27 expression, and suppressed the levels of phospho-cyclin-dependent kinase 2 and phospho-retinoblastoma. Compared to the control, oral administration of AZD8055 significantly suppressed tumor growth in mice (p<0.05). AZD8055 induces cytotoxicity, apoptosis, and cell-cycle arrest of colon cancer cells, and exerts an antitumor effect in mice. It also inhibits the mTOR signaling pathway and mTOR-dependent cell-cycle progression.
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