PMID:17265464

Citation	Mallozzi, C, Martire, A, Domenici, MR, Metere, A, Popoli, P and Di Stasi, AM (2007) L-NAME reverses quinolinic acid-induced toxicity in rat corticostriatal slices: Involvement of src family kinases. J. Neurosci. Res. 85:2770-7
Abstract	Quinolinic acid (QA) is an endogenous excitotoxin acting on N-methyl-d-aspartate receptors (NMDARs) that leads to the pathologic and neurochemical features similar to those observed in Huntington's disease (HD). The mechanism of QA toxicity also involves free radicals formation and oxidative stress. NMDARs are particularly vulnerable to the action of reactive oxygen species (ROS) and reactive nitrogen species (RNS) that can act as modulators of the activity of protein tyrosine kinases (PTKs) and phosphotyrosine phosphatases (PTPs). Because QA is able to activate neuronal nitric oxide synthase (nNOS) as well as to stimulate the NMDARs, we evaluated the effect of Nomega-Nitro-l-arginine-methyl ester (l-NAME), a selective nNOS inhibitor, on QA-induced neurotoxicity in rat corticostriatal slices. In electrophysiologic experiments we observed that slice perfusion with QA induced a strong reduction of field potential (FP) amplitude, followed by a partial recovery at the end of the QA washout. In the presence of l-NAME the recovery of FP amplitude was significantly increased with respect to QA alone. In synaptosomes, prepared from corticostriatal slices after the electrophysiologic recordings, we observed that l-NAME pre-incubation reversed the QA-mediated inhibitory effects on protein tyrosine phosphorylation pattern, c-src, lyn, and fyn kinase activities and tyrosine phosphorylation of NMDAR subunit NR2B, whereas the PTP activity was not recovered in the presence of l-NAME. These findings suggest that NO plays a key role in the molecular mechanisms of QA-mediated excitotoxicity in experimental model of HD.
Links	PubMed Online version:10.1002/jnr.21178
Keywords	Action Potentials/drug effects; Animals; Corpus Striatum/drug effects; Corpus Striatum/ultrastructure; Drug Interactions; Enzyme Inhibitors/pharmacology; In Vitro Techniques; Male; NG-Nitroarginine Methyl Ester/pharmacology; Neurotoxins/toxicity; Phosphotyrosine/metabolism; Quinolinic Acid/toxicity; Rats; Rats, Wistar; Synaptosomes/drug effects; src-Family Kinases/metabolism
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
RAT:LYN	involved_in	GO:0014070: response to organic cyclic compound	ECO:0000270: expression pattern evidence used in manual assertion		P		Seeded From UniProt	complete

References

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