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• W2064752059 endingPage "259" @default.
• W2064752059 startingPage "249" @default.
• W2064752059 abstract "The diversity of opioid receptor expression was examined in astrocytes in low-density and non-dividing (confluent) cultures from the cerebral cortex, hippocampus, cerebellum, and striatum of 1-day-old mice. μ, δ, and κ opioid receptor expression was assessed in individual cells immunocytochemically, by using flow cytometry, and functionally by examining agonist-induced changes in intracellular calcium ([Ca2+]i). Significant spatial and temporal differences were evident in the pattern of expression of μ, δ, and κ receptors among astrocytes. In low-density cultures, greater proportions of astrocytes expressed μ-opioid receptor immunoreactivity in the cerebral cortex and hippocampus (26–34%) than in the cerebellum or striatum (7–12%). At confluence, a greater percentage of astrocytes in cerebellar (26%) and striatal (30%) cultures expressed μ-immunoreactivity. Fewer astrocytes possessed δ-immunoreactivity in low-density striatal cultures (8%) compared to other regions (16–22%). The proportion of δ receptor-expressing astrocytes declined in the cerebellum but increased in the hippocampus. κ-opioid receptors were uniformly expressed by 27–34% of astrocytes from all regions, except in cortical cultures, where the proportion of κ expressing cells was 38% at low-density and decreased to 22% at confluence. Selective μ (PLO 17; H-Tyr-Pro-Phe (N-Me) -D-Pro-NH2, δ ([D-Pen2, D-Pen5] enkephalin), or κ (U50,488H; trans-(±)-3,4-Dichloro-N-methyl-N-[2-(1-pyrrolidinyl) cyclohexyl] benzeneacetamide methanesulfonate) opioid receptor agonists increased [Ca2+]i in subpopulations of astrocytes indicating the presence of functional receptors. Lastly, opioid receptor immunofluorescence varied during the cell division cycle. A greater proportion of astrocytes in the G2/M phase of the cell cycle were μ or δ receptor immunofluorescent than at G0/G1. When astrocytes were reversibly arrested in G1, significantly fewer cells expressed δ receptor immunofluorescence; however, upon reentry into the cell cycle immunofluorescent cells reappeared. In conclusion, opioid phenotype varies considerably among individual cultured astrocytes, and this diversity was determined by regional and developmental (age and cell cycle dependent) differences in the brain. These in vitro findings suggest astroglia contribute to regional and developmental idiosyncrasies in opioid function within the brain. GLIA 22:249–259, 1998. © 1998 Wiley-Liss, Inc." @default.
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• W2064752059 date "1998-03-01" @default.
• W2064752059 modified "2023-10-16" @default.
• W2064752059 title "Regional, developmental, and cell cycle-dependent differences in ?, ?, and ?-opioid receptor expression among cultured mouse astrocytes" @default.
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• W2064752059 doi "https://doi.org/10.1002/(sici)1098-1136(199803)22:3<249::aid-glia4>3.0.co;2-0" @default.
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