Regional study of the co-localization of neuronal nitric oxide synthase with muscarinic receptors in the rat cerebral cortex

Neuroscience
V MoroF Lasbennes

Abstract

There is increasing evidence that nitric oxide is an important molecular messenger involved in a wide variety of biological processes including the regulation of the cerebral circulation. For instance, it has been implicated in the vascular response to nucleus basalis magnocellularis stimulation, a structure which is widely recognized as the predominant source of cholinergic fibres projecting to the neocortex. The present investigation was carried out to determine if muscarinic receptors are present on cortical neurons expressing neuronal nitric oxide synthase (nitric oxide-producing enzyme). To this aim, double labelling of both neuronal nitric oxide synthase/vessels and neuronal nitric oxide synthase/muscarinic receptors was performed on free-floating cryosections obtained from rat brain. The observations were made by confocal laser scanning microscopy. The double labelling of neuronal nitric oxide synthase with the arterioles demonstrated the presence of nitroxidergic fibres in the wall of intraparenchymal vessels. A rich network of nitroxidergic fibres independent of the vessels was also seen in the parenchyma. Since the maximal surface of a square of tissue without any nitroxidergic fibres corresponded to 1400 +/- 105 micr...Continue Reading

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Citations

May 5, 2001·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·A SatoS Uchida
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