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Am J Physiol Regul Integr Comp Physiol 256: R255-R258, 1989;
0363-6119/89 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 256, Issue 1 255-R258, Copyright © 1989 by American Physiological Society

ARTICLES

Retinyl esters in the vertebrate neuroretina

K. A. Rodriguez and A. T. Tsin
Division of Life Sciences, University of Texas, San Antonio 78285.

High-performance liquid chromatography (HPLC) was employed to measure retinyl esters in the vertebrate retina. Both retina and retinal pigment epithelium (RPE) from frog, chicken, and bovine eyes were studied. In comparison to the RPE, the retina possessed a significant level of 11-cis and all trans retinyl palmitate. Using a sensitive radioassay, we also detected the presence of retinyl ester hydrolase (REH) activity in homogenates prepared from both retina and RPE. The rate of retinyl ester hydrolysis in these retinas was sufficiently high to supply retinal chromophores for the metabolic renewal and for the regeneration of visual pigments. In comparison to retinyl esters in the RPE, retinyl esters in the retina are located much closer to the sites of visual pigment synthesis and regeneration. Hence it is possible that these retinyl esters play a more important role in the visual cycle than those in the RPE.


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J. R. Mata, N. L. Mata, and A. T. C. Tsin
Substrate specificity of retinyl ester hydrolase activity in retinal pigment epithelium
J. Lipid Res., March 1, 1998; 39(3): 604 - 612.
[Abstract] [Full Text]


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