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Publication : CREBL2, interacting with CREB, induces adipogenesis in 3T3-L1 adipocytes.

First Author  Ma X Year  2011
Journal  Biochem J Volume  439
Issue  1 Pages  27-38
PubMed ID  21728997 Mgi Jnum  J:180535
Mgi Id  MGI:5306541 Doi  10.1042/BJ20101475
Citation  Ma X, et al. (2011) CREBL2, interacting with CREB, induces adipogenesis in 3T3-L1 adipocytes. Biochem J 439(1):27-38
abstractText  The factors that influence preadipocyte determination remain poorly understood. In the present paper, we report that CREBL2 [CREB (cAMP-response-element-binding protein)-like 2], a novel bZIP_1 protein, is up-regulated during MDI-induced preadipocyte differentiation. During both overexpression and under physiological conditions, CREBL2 interacted and was entirely co-localized with CREB. Overexpression of CREBL2 was sufficient to promote adipogenesis via up-regulating the expression of PPARgamma (peroxisome-proliferator-activated receptor gamma) and C/EBPalpha (CCAAT/enhancer-binding protein alpha) and accelerate lipogenesis accompanied with increased GLUT (glucose transporter) 1 and GLUT4. CREBL2 knockdown restrained adipogenic conversion and lipogenesis. Additionally, depletion of CREB could completely block the effects of overexpressed CREBL2, whereas an increase in CREB could not drive adipogenesis in the absence of CREBL2, indicating that the roles for CREBL2 on adipogenesis were CREB-dependent. Furthermore, siCREBL2 [siRNA (short interfering RNA) against CREBL2] could down-regulate CREB transcriptional activity and suppress CREB phosphorylation. CREB knockdown decreased the CREBL2 protein levels and vice versa. Collectively, the results of the present study indicate that CREBL2 plays a critical role in adipogenesis and lipogenesis via interaction with CREB.
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