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• W2020910010 abstract "The role of endogenous opioids and opioid receptors (endogenous opioid systems) in modulating cell proliferation in the developing mammalian retina was examined in 1-day-old rats. In contrast to a labeling index (LI) of 35.8% in control animals, administration of the opioid peptide [Met5]-enkephalin (100 μg/kg) significantly reduced (10.6%) the proportion of cells incorporating [3H]thymidine; concomitant injection of 1 mg/kg naloxone blocked the inhibitory effects of [Met5]-enkephalin on cell division. Naloxone (1 mg/kg) alone did not alter the LI. The interruption of endogenous opioid-opioid receptor interaction by naltrexone (50 mg/kg), a potent opioid antagonist, was accompanied by a significant increase (6.4%) in the LI relative to control levels. Immunocytochemical experiments revealed the presence of enkephalin-like immunoreactivity, with staining of the cortical cytoplasm of proliferating and differentiating retinal cells recorded; no immunoreactivity was noted in the adult retina. In vitro autoradiography using125I-[Met5]-enkephalin indicated that [Met5]-enkephalin binding sites were localized in the developing retina; no binding of the radiolabeled ligand was recorded in the adult retina. These results demonstrate the presence of growth-related endogenous opioids and opioid receptors in the developing mammalian retina, but not in adult retina, and suggest that endogenous opioids serve as natural inhibitory trophic factors that tonically regulate cell proliferation." @default.
• W2020910010 created "2016-06-24" @default.
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• W2020910010 date "1991-03-01" @default.
• W2020910010 modified "2023-10-16" @default.
• W2020910010 title "Endogenous opioids regulate cell proliferation in the retina of developing rat" @default.
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• W2020910010 doi "https://doi.org/10.1016/0006-8993(91)90887-2" @default.
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