SIRT1 contributes in part to cisplatin resistance in cancer cells by altering mitochondrial metabolism.

Molecular Cancer Research : MCR
Xing-Jie LiangMichael M Gottesman

Abstract

Tumors frequently develop resistance to cisplatin, a platinum drug used as a cornerstone of present-day chemotherapy regimens, significantly decreasing its usefulness in the clinic. Although it is known that cisplatin-resistant (CP-r) cancer cells commonly grow more slowly and exhibit reduced uptake of various compounds, including nutrients, the effect of tumor metabolism on cisplatin resistance is unclear. It was found that in CP-r cells, uptake of 2-deoxyglucose was reduced due to dysfunction and altered morphology of mitochondria compared with cisplatin-sensitive parental cancer cells. The CP-r cells overexpressed SIRT1, a histone deacetylase that plays a central role in DNA damage response and transcriptional silencing. Incubation of drug-sensitive cells in low glucose medium induced the expression of SIRT1 and increased cellular resistance to cisplatin. Reduced SIRT1 expression by a SIRT1 SMART small interfering RNA duplex sensitized the >20-fold resistant CP-r cells to cisplatin treatment 1.5- to 2-fold, and SIRT1 overexpression by SIRT1 cDNA transfection increased cisplatin resistance in cisplatin-sensitive cells by 2- to 3-fold. Our findings therefore suggest that reduced glucose use and altered mitochondrial metabolism...Continue Reading

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