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The Journal of Immunology, Vol 155, Issue 10 4882-4889, Copyright © 1995 by American Association of Immunologists
ARTICLES |
P Gasque, P Chan, M Fontaine, A Ischenko, M Lamacz, O Gotze and BP Morgan
Department of Medical Biochemistry, UWCM, Cardiff, United Kingdom.
The C fragment C5a exerts its important physiologic and pathologic effects through interaction with a specific C5a receptor (C5aR) which is highly expressed on polymorphonuclear leukocytes and some other leukocytes. The presence of this receptor on epithelia and endothelia has recently been documented, raising the possibility that these other cells might also respond to locally generated C5a. C has been implicated in several brain disorders, notably demyelination and neurodegeneration, and cells within brain can synthesize a complete C system. It is thus of interest to examine the mechanisms by which C damages or activates brain cells. To this end we have examined the expression on human fetal astrocytes and astrocyte-derived cell lines of receptors for C fragments. We here report that human astrocytes and cell lines express a receptor for C5a (48 to 72 x 10(3) copies/cell), which is indistinguishable at the protein or mRNA level from that in leukocytes. The astrocyte C5aR was recognized by five different specific Abs, which revealed by Western blotting a protein of 40 to 45 kDa in primary human astrocytes and astrocyte cell lines. Expression was confirmed by RT-PCR using multiple primers. Neither inflammatory cytokines nor PMA caused up-regulation of the receptor on astrocytes. The receptor was functional in that addition of C5a (1 nM to 100 nM) or, at high doses (100 nM), C5adesArg, triggered a calcium transient in astrocytes. We propose that C5aR expression on astrocytes plays an important role in control of inflammation in brain and may be a central component of C-mediated brain injury.
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