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• W1970757672 abstract "The chemokines CCL2 and CCL7 are upregulated in the brain during several neurodegenerative and acute diseases associated with infiltration of peripheral leukocytes. Astrocytes can respond to inflammatory cytokines like IL-1beta and TNF-alpha by producing chemokines. This study aims to test the ability of IL-1beta and TNF-alpha to stimulate CCL2 and CCL7 protein production in rat astrocyte cultures, and to elucidate signaling pathways involved in the cytokine-stimulated chemokine upregulation. Astrocytes were stimulated with IL-1beta or TNF-alpha, and CCL2 and CCL7 levels determined by ELISA. Our results show that IL-1beta and TNF-alpha each stimulate production of the chemokines CCL2 and CCL7 in astrocytes in a concentration- and time-dependent manner, with CCL2 showing a more rapid and robust response to the cytokine treatment than CCL7. As a first step to determine the signaling pathways involved in CCL2 and CCL7 upregulation, we stimulated astrocytes with IL-1beta or TNF-alpha in the presence of selective inhibitors of MAPK pathways (SB203580 and SB202190 for p38, SP600125 for JNK, and U0126 for ERK) or NFkappaB pathways (MG-132 and SC-514). We found that NFkappaB pathways are important for the cytokine-stimulated CCL2 and CCL7 production, whereas MAPK pathways involving p38 and JNK, but not ERK, may also contribute but to a lesser extent. These data document for the first time that CCL7 protein production can be stimulated in astrocytes by cytokines, and that the upregulation may involve NFkappaB- and p38/JNK-regulated pathways. In addition, our results suggest that CCL2 and CCL7 share similarities in the signaling pathways necessary for their upregulation." @default.
• W1970757672 created "2016-06-24" @default.
• W1970757672 creator A5024523607 @default.
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• W1970757672 date "2009-09-01" @default.
• W1970757672 modified "2023-10-04" @default.
• W1970757672 title "Inflammatory cytokines stimulate the chemokines CCL2/MCP-1 and CCL7/MCP-7 through NFκB and MAPK dependent pathways in rat astrocytes" @default.
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• W1970757672 doi "https://doi.org/10.1016/j.brainres.2009.06.081" @default.
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