当前位置： SCI文献检索 > EXPERIMENTAL CELL RESEARCH期刊下所有文献 > Cytokeratin 19 regulates endoplasmic reticulum stress and inhibits ERp29 expression via p38 MAPK/XBP-1 signaling in breast cancer cells.

Cytokeratin 19 regulates endoplasmic reticulum stress and inhibits ERp29 expression via p38 MAPK/XBP-1 signaling in breast cancer cells.

Abstract：

:Cytokeratin 19 (CK19) is widely used as a biomarker for the detection of disseminated tumor cells in blood and bone marrow, and its positivity is considered as an independent prognostication indicator in cancer patients. However, its role in breast cancer progression remains unknown. We had established a stable CK19-expressing clone in the CK19-negative BT549 human breast cancer cell line and found that CK19 expression in the BT549 cells caused cell cycle arrest, reduced cell motility and increased drug resistance. Further study revealed that CK19 expression regulated endoplasmic reticulum (ER) stress signaling by up-regulating p38/RNA-dependent protein kinase-like ER kinase (PERK)/p-eIF2alpha and 78 kDa glucose-regulated protein (Bip/GRP78), and down-regulating focal adhesion kinase (FAK). The level of ER protein 29 (ERp29) was shown to be decreased in the CK19-expressing BT549 cells by proteomic analyses and verified by Western blotting and RT-PCR. Pharmacological inhibition of p38 signaling by its specific inhibitor SB203580 or knockdown of p38 and transcription factor XBP-1 by siRNA in BT549/CK19 and MDA-MB-231 cells revealed that p38/XBP-1 signaling negatively regulated ERp29 expression. Our results indicated that CK19 modulates ER stress signaling and contributes to cell survival and dormancy in breast cancer cells.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Bambang IF,Lu D,Li H,Chiu LL,Lau QC,Koay E,Zhang D

doi

10.1016/j.yexcr.2009.02.017

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

1964-74

issue

11

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(09)00084-6

journal_volume

315

pub_type

杂志文章

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