The effect of glutamate on primary cultures of rat cortical astrocytes was studied using Northern blot hybridization. Incubation with glutamate (100 microM, 15 min) induced nerve growth factor (NGF), basic fibroblast growth factor (bFGF), FGF receptor (FGF-R1) and proto-oncogene c-fos gene expression in a time dependent manner. Maximal induction of NGF, bFGF and FGF-R1 mRNA was reached after 4 h of incubation (7.2-fold induction of NGF, 3-fold increase in bFGF and 3.6-fold induction of FGF-R1 mRNA). The induction kinetics of NGF, bFGF and FGF-R1 mRNA are similar. The rapid (1 h) 77-fold induction of the c-fos transcript precedes the induction of the other genes tested.
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