PMID: 11311510Apr 20, 2001Paper

Synergistic stimulation, by tumor necrosis factor-alpha and interferon-gamma, of fractalkine expression in human astrocytes

Neuroscience Letters
Hidemi YoshidaK Satoh

Abstract

Fractalkine is a CX3C chemonkine that appears to be a neuron-to-microglia signal molecule in the central nervous system. We studied the expression of fractalkine in normal human astrocytes in culture, by using semi-quantitative reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay. We found that tumor-necrosis factor alpha (TNF-alpha) and interferon-gamma (IFN-gamma) synergistically enhance the expression of fractalkine. The expression of both fractalkine mRNA and protein was increased in time- and concentration-dependent manners in the cells co-stimulated with TNF-alpha and IFN-gamma. Cycloheximide, an inhibitor of protein synthesis, and dexamethasone had no effect on the synergy of the stimulation of fractalkine expression. We conclude that normal human astrocytes produce fractalkine by co-stimulation with pro-inflammatory cytokines and it may serve as a potential signal for immune and inflammatory responses in the central nervous system.

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Citations

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