Interleukin-1beta and Anaphylatoxins Exert a Synergistic Effect on NGF Expression by Astrocytes

Overview

Journal J Neuroinflammation

Publisher Biomed Central

Date 2006 Apr 6

PMID 16594997

Citations 31

Authors

Anne-christine Jauneau

Alexander Ischenko

Alexandra Chatagner

Magalie Benard

Philippe Chan

Marie-Therese Schouft

Christine Patte

Hubert Vaudry

Marc Fontaine

Affiliations

Soon will be listed here.

Abstract

C3a and C5a anaphylatoxins are proinflammatory polypeptides released during complement activation. They exert their biological activities through interaction with two G protein-coupled receptors named C3aR and C5aR, respectively. In the brain, these receptors are expressed on glial cells, and some recent data have suggested that anaphylatoxins could mediate neuroprotection. In this study, we used RT-PCR and ribonuclease protection assays (RPA) to investigate the role of anaphylatoxins on neurotrophin expression by the human glioblastoma cell line T98G and by rat astrocytes. Our data show that for both cell types, anaphylatoxins upregulate expression of NGF mRNA. This response depended on a G protein-coupled pathway since pre-treatment of cells with pertussis toxin (PTX) completely blocked NGF mRNA increases. This effect was anaphylatoxin-specific since pre-incubation with anti-C3a or anti-C5aR antibodies abolished the effects of C3a and C5a, respectively. The regulation of NGF mRNA by anaphylatoxins was not accompanied by translation into protein expression, but there was a significant synergic effect of anaphylatoxins/IL-1b costimulation. Our demonstration of involvement of anaphylatoxins in the NGF release process by astrocytes suggests that C3a and C5a could modulate neuronal survival in the CNS.

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