Retinoic acid receptors and retinoid X receptors in the mature retina: subtype determination and cellular distribution.

Abstract:

PURPOSE:In the mature retina retinoic acid (RA) biosynthesis was reported to be regulated by light. RA is of vital importance for proper function of the retina. RA activity is mediated by interaction with nuclear retinoic acid receptors (RARs) and retinoid X receptors (RXRs). The purpose of this study was to determine if and which RARs and RXRs are present in the mature retina, and to determine their location within the retina. METHODS:The reverse transcriptase polymerase chain reaction (RT-PCR) was used to amplify cDNA fragments encoding RARalpha, RARbeta, RARgamma, RXRalpha, RXRbeta, and RXRgamma from human retinal RNA. RT-PCR products were cloned, sequenced, and used in Northern blot experiments. Antibodies directed against each receptor subtype were used for immunocytochemical analysis. RESULTS:RT-PCR and Northern blot analysis indicated that all RAR and RXR subtypes are present in the mature retina. Western blot analysis, using a cytoplasmic protein fraction isolated from the bovine and human neural retina, showed the presence of RXRalpha. Immunocytochemical analysis of the human, bovine, and rat retina showed that RARalpha is highly expressed in the outer segments of cone photoreceptor cells. RXRalpha expression was observed in the rod inner segment layer. RXRgamma was detected in the nuclei and outer segments of cone photoreceptor cells. CONCLUSIONS:The retinal expression pattern of RARs and RXRs is heterogeneous. The observation that RXRalpha is present in rods whereas RARalpha is present in cones, suggests a mechanism by which RA that is produced upon bleaching, could generate different responses in the two photoreceptor cell subtypes.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Janssen JJ,Kuhlmann ED,van Vugt AH,Winkens HJ,Janssen BP,Deutman AF,Driessen CA

doi

10.1076/ceyr.19.4.338.5307

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

338-47

issue

4

eissn

0271-3683

issn

1460-2202

journal_volume

19

pub_type

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