miR-221/222 suppression protects against endoplasmic reticulum stress-induced apoptosis via p27(Kip1)- and MEK/ERK-mediated cell cycle regulation.

Abstract:

:Cancer cells are relatively resistant to endoplasmic reticulum (ER) stress-induced apoptosis. However, the underlying mechanisms remain largely unclear. We observed that the microRNAs miR-221/222 are associated with apoptosis regulation under ER stress in human hepatocellular carcinoma (HCC) cells. Induction of ER stress does not trigger significant apoptosis but obviously causes downregulation of miR-221/222 in HCC cells. In these cells, ER stress-induced apoptosis is enhanced by miR-221/222 mimics and attenuated by miR-221/222 inhibitors. miR-221/222 promoted-apoptosis under ER stress is associated with p27(Kip1)- and MEK/ERK-mediated cell cycle regulation. Our results suggest that suppression of miR-221/222 plays a crucial role in the protection against apoptosis induced by ER stress in HCC cells.

journal_name

Biol Chem

journal_title

Biological chemistry

authors

Dai R,Li J,Liu Y,Yan D,Chen S,Duan C,Liu X,He T,Li H

doi

10.1515/BC.2010.072

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

791-801

issue

7

eissn

1431-6730

issn

1437-4315

journal_volume

391

pub_type

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