RGD Reference Report - Signaling by vitamin A and retinol-binding protein in regulation of insulin responses and lipid homeostasis. - Rat Genome Database

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Signaling by vitamin A and retinol-binding protein in regulation of insulin responses and lipid homeostasis.

Authors: Berry, DC  Noy, N 
Citation: Berry DC and Noy N, Biochim Biophys Acta. 2012 Jan;1821(1):168-76. Epub 2011 Jul 12.
RGD ID: 6484671
Pubmed: PMID:21782034   (View Abstract at PubMed)
PMCID: PMC3204314   (View Article at PubMed Central)
DOI: DOI:10.1016/j.bbalip.2011.07.002   (Journal Full-text)

Vitamin A, retinol, circulates in blood bound to serum retinol binding protein (RBP) and is transported into cells by a membrane protein termed stimulated by retinoic acid 6 (STRA6). It was reported that serum levels of RBP are elevated in obese rodents and humans, and that increased level of RBP in blood causes insulin resistance. A molecular mechanism by which RBP can exert such an effect is suggested by the recent discovery that STRA6 is not only a vitamin A transporter but also functions as a surface signaling receptor. Binding of RBP-ROH to STRA6 induces the phosphorylation of a tyrosine residue in the receptor C-terminus, thereby activating a JAK/STAT signaling cascade. Consequently, in STRA6-expressing cells such as adipocytes, RBP-ROH induces the expression of STAT target genes, including SOCS3, which suppresses insulin signaling, and PPARgamma, which enhances lipid accumulation. RBP-retinol thus joins the myriad of cytokines, growth factors and hormones which regulate gene transcription by activating cell surface receptors that signal through activation of Janus kinases and their associated transcription factors STATs. This article is part of a Special Issue entitled Retinoid and Lipid Metabolism.

Molecular Pathway Annotations    Click to see Annotation Detail View

RGD Manual Annotations

Objects Annotated

Genes (Rattus norvegicus)
Rbp4  (retinol binding protein 4)
Stra6  (signaling receptor and transporter of retinol STRA6)
Ttr  (transthyretin)

Genes (Mus musculus)
Rbp4  (retinol binding protein 4, plasma)
Stra6  (stimulated by retinoic acid gene 6)
Ttr  (transthyretin)

Genes (Homo sapiens)
RBP4  (retinol binding protein 4)
STRA6  (signaling receptor and transporter of retinol STRA6)
TTR  (transthyretin)


Additional Information