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• W2007193770 abstract "Astrocytes are major sources of chemokines and are thus critical effectors of central nervous system (CNS) inflammation. However, it is as yet unclear whether these cells, like leukocytes, also possess receptors for chemokines (CCRs). To address this issue, we utilized a novel fluorescence approach to detect qualitatively and quantitatively binding sites for biotinylated derivatives of the β chemokines monocyte chemotactic protein-1 (MCP-1) and macrophage inflammatory protein-1α (MIP-1α) on cultured human fetal astrocytes. Both chemokines were found to bind to the surface of astrocytes in a specific and saturable manner and with the high-affinity typical of these chemokines' binding to leukocyte CCRs. Binding of labeled MCP-1 and of labeled MIP-1α was antagonized by the respective unlabeled homologue but not by the unlabeled heterologous chemokine. Binding of labeled MCP-1 was also inhibited by unlabeled MCP-3, both of which are ligands for CCR2. In a parallel manner, binding of labeled MIP-1α was first shown to be attenuated by unlabeled RANTES, both of which recognize CCR1 and CCR5, and then separately antagonized by MCP-3 and MIP-1β, which bind to CCR1 and CCR5, respectively. Finally, binding of both labeled chemokines was observed to be modulated in response to astrocyte stimulation by proinflammatory cytokines interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α), further indicating that these binding sites are subject to regulation and, thus, likely to be physiologically responsive. Collectively, these results indicate that binding sites exhibiting characteristics of chemokine receptors exist on human astrocytes. Such sites might function in the recruitment of both astrocytes and leukocytes to specified brain regions during physiological and pathophysiological processes. GLIA 28:225–235, 1999. © 1999 Wiley-Liss, Inc." @default.
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• W2007193770 date "1999-12-01" @default.
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• W2007193770 title "Expression of binding sites for ? chemokines on human astrocytes" @default.
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• W2007193770 doi "https://doi.org/10.1002/(sici)1098-1136(199912)28:3<225::aid-glia6>3.0.co;2-6" @default.
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