A Role for Nitric Oxide in Long-term Potentiation.

Eur J Neurosci 1992 ;4(5):420-424

Rhône - Poulenc Rorer Central Research, Centre de Recherches de Vitry-Alfortville, 94403 Vitry-sur-Seine, France.

Nitric oxide production in the cerebellum and induction of long-term potentiation (LTP) in the hippocampus have some characteristics in common: both phenomena are induced by activation of N-methyl-d-aspartate receptors and both are highly dependent on calcium-mediated processes. Here we provide evidence that endogenous nitric oxide production is necessary for synaptic plasticity in the CA1 hippocampus of the rat. LTP recorded in slices was blocked in a concentration-dependent manner by the nitric oxide synthase inhibitors l-NG-nitroarginine and l-NG-nitroarginine methyl ester, but l-NG-monomethylarginine was only marginally active. Bathing the slices with haemoglobin, a protein that scavenges nitric oxide, also resulted in a concentration-dependent blockade of LTP. Nitric oxide released locally from hydroxylamine produced a stable potentiation of synaptic transmission that was not additive with LTP induced by high-frequency stimulation. These results are fully consistent with the presumed retrograde messenger role of nitric oxide in LTP.

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http://dx.doi.org/10.1111/j.1460-9568.1992.tb00891.xDOI Listing
January 1992
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