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Journal of Dairy Science Vol. 64 No. 12 2419-2421
© 1981 by American Dairy Science Association ®
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Retinol Esterification in Lamb Kidney

Susan Donoghue, Kaye Johnson, W. J. Donawick and D. Sklan1

Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348

ABSTRACT

Retinol esterification was demonstrated in vivo and in vitro in lamb kidney. Retinol labeled with hydrogen-3 injected into the renal artery of lambs appeared in the labeled retinyl ester fraction in the renal vein. Degree of tracer incorporation into retinyl esters increased with vitamin A intake. In homogenates, activity was concentrated in microsomes and enhanced fourfold by addition of adenosine 5'-triphosphate and coenzyme A to the incubation mixture. These findings suggest that the esterification is a function of fatty acyl coenzyme A:retinol acyl transferase. Renal esterification may play a role in retinol homeostasis.

FOOTNOTES

1 Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel.






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Copyright © 1981 by the American Dairy Science Association ®.