Low-dose Docetaxel Enhanced the Anticancer Effect of Temsirolimus by Overcoming Autophagy in Prostate Cancer Cells

Background/Aim: Chemotherapy with docetaxel (DTX) is used for castration-resistant prostate cancer (CRPC), but it is inadequate. Materials and Methods: We evaluated the effect of the combination treatment DTX and the mTOR inhibitor temsirolimus (TEM) in the PC3 prostate cancer cell line, by focusing...

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Bibliographic Details
Published in:Anticancer research 2019-10, Vol.39 (10), p.5417-5425
Main Authors: INAMURA, SO, ITO, HIDEAKI, TAGA, MINEKATSU, TSUCHIYAMA, KATSUKI, HOSHINO, HITOMI, KOBAYASHI, MOTOHIRO, YOKOYAMA, OSAMU
Format: Article
Language:English
Subjects:
Anticancer properties
Apoptosis
Autophagy
Castration
Cell proliferation
Chemotherapy
Phagocytosis
Prostate cancer
TOR protein
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Summary:Background/Aim: Chemotherapy with docetaxel (DTX) is used for castration-resistant prostate cancer (CRPC), but it is inadequate. Materials and Methods: We evaluated the effect of the combination treatment DTX and the mTOR inhibitor temsirolimus (TEM) in the PC3 prostate cancer cell line, by focusing on the induction of autophagy and apoptosis. Results: TEM induced autophagy but not apoptosis even at a high dose, whereas DTX induced apoptosis. The combination of low-dose DTX and TEM caused a 34% suppression in cell proliferation compared to monotherapy with a higher dose of DTX. The induction of apoptosis was increased by their combination. The combination with DTX overcame the induction of autophagy by TEM. The combination treatment suppressed tumor growth 72% less than the control group after 14 days of treatment in vivo. Conclusion: The combination of TEM and DTX induced apoptosis by overcoming autophagy and enhanced the anticancer effect compared to monotherapy.
ISSN:0250-7005
1791-7530
DOI:10.21873/anticanres.13735