Effects of riluzole on N-methyl-D-aspartate-induced tyrosine phosphorylation in the rat hippocampus.
Since increased tyrosine phosphorylation has been observed in response to brain ischemia, we investigated whether riluzole (an inhibitor of glutamate neurotransmission with neuroprotective properties) affects tyrosine phosphorylation stimulated by N-methyl-D-aspartate (NMDA) in rat hippocampal slices. Riluzole produced an extremely potent concentration-related inhibition of NMDA (1 mM)-stimulated protein tyrosine phosphorylation (IC(50)=0.5+/-0.03 microM, mean+/-S.D.), but failed to affect that evoked by phorbol 12-myristate 13-acetate (PMA, an activator of protein kinase C, 0.1 and 1 microM). These results suggest that inhibition of tyrosine phosphorylation may contribute to the neuroprotective effects of riluzole against excitotoxic injury.
Peyclit
A
A
Institut National de la Santé et de la Recherche Médicale U 408, Faculté Xavier Bichat, 16 rue Henri Huchard, 75018 Paris, France.
Keita
H
H
Juvin
P
P
Derkinderen
P
P
Jardinaud
F
F
Rouellé
D
D
Boczkowski
J
J
Desmonts
J M
JM
Girault
J A
JA
Mantz
J
J
D000818:Animals; D002273:Carcinogens / Q000494:pharmacology; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology*; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D016202:N-Methylaspartate / Q000494:pharmacology*; D018696:Neuroprotective Agents / Q000494:pharmacology*; D009498:Neurotoxins / Q000378:metabolism; D010766:Phosphorylation; D011233:Precipitin Tests; D011493:Protein Kinase C / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017470:Receptors, Glutamate / Q000378:metabolism; D019782:Riluzole / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014443:Tyrosine / Q000378:metabolism*
D002273:Carcinogens; D018690:Excitatory Amino Acid Agonists; D018696:Neuroprotective Agents; D009498:Neurotoxins; D017470:Receptors, Glutamate; D014443:Tyrosine; D016202:N-Methylaspartate; D019782:Riluzole; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate