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Journal of Lipid Research, Vol 27, 1084-1088, Copyright © 1986 by Lipid Research, Inc.

ARTICLES

Effects of dietary retinoic acid on cellular retinol- and retinoic acid- binding protein levels in various rat tissues

WS Blaner, K Das, JR Mertz, SR Das and DS Goodman

A study was conducted to explore the effects of retinoic acid, fed to retinol-deficient rats, on the tissue distribution and levels of cellular retinol-binding protein (CRBP) and cellular retinoic acid- binding protein (CRABP). Sensitive and specific radioimmunoassays were employed to measure the levels of both CRBP and CRABP. Two groups of six male rats each were fed a purified retinoid-deficient diet supplemented with either: i) retinyl acetate (control group); or ii) retinoic acid (30 mg/kg diet) (retinol deficient-retinoic acid group). The retinoic acid supplementation was begun after 38 days on the retinoid-deficient diet alone, and was continued for 52-54 days. Analysis of the data indicated that only the CRBP level of the proximal epididymis in the retinol-deficient/retinoic acid group differed significantly from (was lower than) the corresponding control level, at the 1% confidence level. CRABP tissue levels did not differ significantly between the two groups. Thus, a moderately large intake of retinoic acid, as the only source of retinoids, had very little effect on the tissue distribution or levels of either its own cellular binding protein (CRABP) or of CRBP. This study provides further information showing that the tissue levels of the cellular retinoid- binding proteins are highly regulated and maintained in rats, even in the presence of marked changes in retinoid nutritional status.
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				S. Wei, V. Episkopou, R. Piantedosi, S. Maeda, K. Shimada, M. E. Gottesman, and W. S. Blaner Studies on the Metabolism of Retinol and Retinol-binding Protein in Transthyretin-deficient Mice Produced by Homologous Recombination J. Biol. Chem., January 13, 1995; 270(2): 866 - 870. [Abstract] [Full Text] [PDF]