Contributions of microRNA dysregulation to cisplatin resistance in adenocarcinoma cells.

Abstract:

:Cisplatin resistance in cancer cells is due to a pleiotropic phenotype transition that allows cells to resist cell death. miRNAs have been shown to be reliable markers of phenotype, critical in cell differentiation, and dysregulated in cancer and other pathologies. Here we investigate the influence of miRNA on cisplatin resistance in KB adenocarcinoma cells. Silencing both DICER and TRBP2 in the miRNA biosynthesis pathway in KB-3-1 (sensitive parental), KB-CP.5 (cisplatin-resistant), and KB-CP20 (highly cisplatin-resistant) cells resulted in the reversal of cisplatin resistance, with no effect on cell viability in the absence of cisplatin. We found miR-181 expression differences in the cell lines using RT-PCR, with several members of the miR-181 family overexpressed in two KB cisplatin-resistant lines and in two cisplatin-resistant lung cancer lines, compared to their respective parental cells. Functional assays showed minimal effects of miR-181 on cisplatin resistance. We conclude that the miRNA biosynthesis pathway is critical for maintaining the cisplatin-resistant phenotype, but that it is difficult to determine the precise miRNAs involved in cisplatin resistance simply using expression profiles of individual miRNA species. Functional assays are needed to determine the influence of a specific miRNA and different members of the same miRNA family may have opposite effects.

journal_name

Exp Cell Res

authors

Pouliot LM,Shen DW,Suzuki T,Hall MD,Gottesman MM

doi

10.1016/j.yexcr.2012.10.012

subject

Has Abstract

pub_date

2013-02-15 00:00:00

pages

566-74

issue

4

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(12)00433-8

journal_volume

319

pub_type

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