Cytokine regulation of CC and CXC chemokine expression by human astrocytes - PubMed (original) (raw)
Cytokine regulation of CC and CXC chemokine expression by human astrocytes
J W Oh et al. J Neurovirol. 1999 Feb.
Abstract
Chemokines constitute a large family of secreted proteins that function as chemoattractants and activators of leukocytes. Astrocytes, the major glial cell type in the central nervous system (CNS), are a source of chemokine production within diseased brain. As such, we have examined the production of chemokines by human astroglioma cell lines and primary human astrocytes treated with a variety of stimuli, including LPS, TNF-alpha, IFN-gamma and IL-1beta. In addition, IL-6 in conjunction with the soluble IL-6 receptor (sIL-6R), and hybrid IL-6 (H-IL-6), a highly active fusion protein of sIL-6R and IL-6, were tested for their ability to induce chemokine expression. The findings presented herein demonstrate that both human astroglioma cell lines and primary human astrocytes express the CXC chemokines IP-10 and IL-8 and the CC chemokines MCP-1 and RANTES in response to TNF-alpha and IL-1beta. IFN-gamma induced the expression of IP-10, but not of IL-8, MCP-1 or RANTES. Surprisingly, IL-6/sIL-6R and H-IL-6 had little or no effect on chemokine expression in these cells. The effect of TGF-beta on chemokine expression in human astroglioma cell lines and astrocytes was also examined. TGF-beta alone had little or no effect on RANTES, MCP-1 and IL-8 expression; however, TGF-beta synergized with TNF-alpha to enhance MCP-1 expression in both astroglioma cells and primary astrocytes. An inhibitory effect of TGF-beta on TNF-alpha and IL-1beta induced RANTES and IL-8 expression was observed in human astroglioma cells. In contrast, TGF-beta enhanced TNF-alpha and IL-1beta induction ofIL-8 production by human astrocytes. These findings document a complex pattern of chemokine regulation by the pleiotropic cytokine TGF-beta with both enhancing and inhibitory effects.
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