Antisense inhibition of microRNA-21 or -221 arrests cell cycle, induces apoptosis, and sensitizes the effects of gemcitabine in pancreatic adenocarcinoma.

Abstract:

OBJECTIVES:The contribution of overexpressed microRNA-21 and -221 (miR-21 and miR-221) to the malignant phenotype was determined by inhibiting these miRNAs using antisense oligonucleotides. METHODS:The effects of antisense to miR-21 and miR-221 on cell proliferation, cell cycle arrest, induction of apoptosis, combinatorial effects with gemcitabine, and effects on target protein levels were studied. RESULTS:Low nanomolar concentrations of both antisense oligonucleotides reduced proliferation of pancreatic cancer cell lines. Reduced proliferation was less pronounced in the normal ductal epithelial cell line human pancreatic Nestin-expressing cell or in pancreatic cancer cell lines exposed to an irrelevant control oligonucleotide. Inhibition of miR-21 and miR-221 increased the amount of apoptosis in HS766T cells by 3- to 6-fold compared with the control oligonucleotide. HS766T cells exposed to miR-21 antisense resulted in cell cycle arrest (G1 phase). Protein levels of tumor suppressor targets of the miRNAs were increased by antisense to miR-21 (PTEN and RECK) and miR-221 (p27). Antisense to miR-21 and miR-221 sensitized the effects of gemcitabine, and the antisense-gemcitabine combinations were synergistic at high fraction affected. CONCLUSIONS:We demonstrate that antisense to miR-21 and miR-221 results in significant cell killing under various conditions and that antisense oligonucleotides targeted to miRNA represents a potential new therapy for pancreatic cancer.

journal_name

Pancreas

journal_title

Pancreas

authors

Park JK,Lee EJ,Esau C,Schmittgen TD

doi

10.1097/MPA.0b013e3181ba82e1

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

e190-9

issue

7

eissn

0885-3177

issn

1536-4828

journal_volume

38

pub_type

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