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Retinoid-X receptors (RXRs) are 9-cis-retinoic acid (9CRA)-dependent gene transcription factors, which modulate the action of all-trans-retinoic acid (ATRA), fatty acids, thyroid hormone (TH), and vitamin D (VD) by forming dimers with themselves or ATRA, TH, peroxisome proliferator activator receptors (PPARs), or VD receptors (VDRs). To determine if 9CRA and RXRs have a role in secretion, RINm5F cells...
Using intact rat islets, hamster In-R1-G9 cells, and mouse αTC-1 clone 9 transgenic tumoral glucagon-secreting cells, we determined the effects of retinol (ROH) and retinoic acid (RA) on glucagon secretion. Since vitamin A effects may be mediated through nuclear RA receptors (RARs) and cytoplasmic ROH- and RA-binding proteins (CRBP and CRABP), cells were also assayed for RARs, CRBP, and CRABP mRNA...