CRABP: cellular retinoic acid binding protein; CRBP: cellular retinol binding protein; FABP: fatty acid binding protein; I-BABP: intestinal bile acid binding protein; iLBP: intracellular lipid binding protein; ITC: isothermal titration calorimetry; PPAR: peroxisome proliferator activated receptor; PPRE: peroxisome proliferator responsive element; RAR: retinoic acid receptor; RARE: retinoic acid...

In HEK293S cells expressing opsin, rhodopsin regenerates on addition of all-trans retinol. This study was to determine if key proteins in the retinal pigment epithelium (RPE) are present in these cells. Cellular retinoid binding protein, cellular retinoic-acid binding protein, RPE65, caveolin-1-alpha- and -beta-isoforms, interphotoreceptor retinoid binding protein, and 11-cis retinol dehydrogen...

Retinol (vitamin A alcohol) is involved in the proper differentiation of epithelia. The mechanism of this involvement is unknown. We have previously reported that purified cellular retinol-binding (CRBP) will mediate specific binding of retinol to nuclei isolated from rat liver. We now report that pure CRBP delivers retinol to the specific nuclear binding sites without itself remaining bound. T...

PURPOSE Interphotoreceptor retinoid-binding protein (IRBP) is unusual for a lipid-binding protein in that its gene is expressed uniquely by cells of photoreceptor origin and consists of four homologous repeats, each coding for a module of approximately 300 amino acid residues. All-trans retinol binding domains, which appear to be present in each module, are composed of conserved hydrophobic reg...

The plasma membrane protein STRA6 transports vitamin A from its blood carrier retinol binding protein (RBP) into cells, and it also functions as a cytokine receptor which activates JAK/STAT signaling. We show here that, unlike other cytokine receptors, phosphorylation of STRA6 is not simply induced upon binding of its extracellular ligand. Instead, activation of the receptor is triggered by STR...

Effect of vitamin A compounds on the covalent binding of benzo(a)pyrene [B(a)P] to subnuclear components was studied using rat liver nuclei in vitro. The retinol-induced inhibition of the covalent binding of B(a)P depended both on the dose and the time of addition. Retinal and retinyl acetate were both potent inhibitors, but retinoic acid was less effective. Retinol induced marked inhibition of...

OBJECTIVE Retinol-binding protein (RBP) 4 is an adipokine of which plasma levels are elevated in obesity and type 2 diabetes. The aims of the study were to identify determinants of plasma RBP4 and RBP4 mRNA expression in subcutaneous adipose tissue (SAT) and skeletal muscle and to investigate the association between RBP4 and in vivo measures of glucose metabolism. RESEARCH DESIGN AND METHODS ...