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Delanzomib Interacts with Ritonavir Synergistically to Cause Endoplasmic Reticulum Stress in Renal Cancer Cells.
Anticancer Research 2018 June
BACKGROUND/AIM: To investigate the efficacy against renal cancer cells of combining the HIV protease inhibitor ritonavir with the novel proteasome inhibitor delanzomib.
MATERIALS AND METHODS: Renal cancer cell lines 769-P, 786-O, Caki-2 and Renca were treated with ritonavir and delanzomib in vitro and in vivo, and the efficacy of combination was evaluated.
RESULTS: The combination of ritonavir and delanzomib synergistically inhibited renal cancer growth and suppressed colony formation. It induced robust apoptosis evidenced by increased cell population in the sub-G1 fraction and increased number of annexin-V-positive cells. A 13-day treatment with the combination was well tolerated in the mouse model and inhibited tumor growth significantly. Mechanistically, the combination synergistically induced endoplasmic reticulum stress and inhibited the mammalian target of rapamycin (mTOR) pathway.
CONCLUSION: The effectiveness of combination of ritonavir and delanzomib appears to be due to the induction of ER stress and inhibition of the mTOR pathway.
MATERIALS AND METHODS: Renal cancer cell lines 769-P, 786-O, Caki-2 and Renca were treated with ritonavir and delanzomib in vitro and in vivo, and the efficacy of combination was evaluated.
RESULTS: The combination of ritonavir and delanzomib synergistically inhibited renal cancer growth and suppressed colony formation. It induced robust apoptosis evidenced by increased cell population in the sub-G1 fraction and increased number of annexin-V-positive cells. A 13-day treatment with the combination was well tolerated in the mouse model and inhibited tumor growth significantly. Mechanistically, the combination synergistically induced endoplasmic reticulum stress and inhibited the mammalian target of rapamycin (mTOR) pathway.
CONCLUSION: The effectiveness of combination of ritonavir and delanzomib appears to be due to the induction of ER stress and inhibition of the mTOR pathway.
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