[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5483/BMBRep.2011.44.11.735

Tunicamycin negatively regulates BMP2-induced osteoblast differentiation through CREBH expression in MC3T3E1 cells

Jang, Won-Gu (Dental Science Research Institute and BK21, School of Dentistry, Chonnam National University)
Kim, Eun-Jung (Dental Science Research Institute and BK21, School of Dentistry, Chonnam National University)
Koh, Jeong-Tae (Dental Science Research Institute and BK21, School of Dentistry, Chonnam National University)

Publication Information

BMB Reports / v.44, no.11, 2011 , pp. 735-740 More about this Journal

Abstract

Tunicamycin, an endoplasmic reticulum (ER) stress inducer, specifically inhibits N-glycosylation. The cyclic AMP (cAMP) response element-binding protein H (CREBH) was previously shown to be regulated by UPR-dependent proteolytic cleavage in the liver. On the other hand, the role of CREBH in other tissues is unknown. In the present study, tunicamycin increased the level of CREBH activation (cleavage) as well as mRNA expression in osteoblast cells. Adenoviral (Ad) overexpression of CREBH suppressed BMP2-induced expression of alkaline phosphatase (ALP) and osteocalcin (OC). Interestingly, the BMP2-induced OASIS (structurally similar to CREBH, a positive regulator of osteoblast differentiation) expression was also inhibited by CREBH overexpression. In addition, inhibition of CREBH expression using siRNA reversed the tunicamycin-suppressed ALP and OC expression. These results suggest that CREBH inhibited osteoblast differentiation via suppressing BMP2-induced ALP, OC and OASIS expression in mouse calvarial derived osteoblasts.

Keywords

CREBH; ER stress; Osteoblast differentiation; Tunicamycin;

Citations & Related Records

Times Cited By Web Of Science : 2 (Related Records In Web of Science)
Times Cited By SCOPUS : 2

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