Abstract：
:The actions of dopamine are mediated by 5 or more receptor subtypes, any of which may be coupled by G-proteins to adenylate cyclase (D1-family: stimulatory, D2-family: inhibitory or no action). Postnatal ocular growth in the chick is a vision-dependent mechanism which involves D2-type receptors in either the retina or the retinal pigment epithelium (RPE). Although the dopaminergic amacrine cells are well described in the chick retina, only D2-receptors, but not D3- and D4-receptors have been clearly localized, and the cells that express them have not been identified. In this study we showed that immunoreactive D2/3-receptor protein is localized to the photoreceptor inner segments, outer and inner plexiform layer and ganglion cell layer, as described previously (Wagner et al., J. Comp. Neurol., 330 (1993) 1-13). D2-receptor mRNA was localized to cell bodies in all nuclear layers of the retina, whereas D4-receptor mRNA was restricted to the inner half of the retina. Immunoreactive D2-type receptors and their mRNA were observed also in the basal region of the RPE. Because of the widespread distribution of both D2- and D4-receptor mRNA in the chick retina and RPE and the lack of D3- and D4-receptor-specific antibodies, we were unable to identify which of the D2/3/4-receptor-bearing cells are involved in controlling ocular growth.
journal_name
Brain Resjournal_title
Brain researchauthors
Rohrer B,Stell WKdoi
10.1016/0006-8993(95)00700-zsubject
Has Abstractpub_date
1995-10-16 00:00:00pages
110-6issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(95)00700-Zjournal_volume
695pub_type
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