Abstract
Nitric oxide (NO) is a neuronal messenger that it is thought to be involved in the nociceptive transmission modulation. The activity of nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d) was shown to be identical to NOS activity in the brain. Since the periaqueductal gray matter (PAG) plays an important role in pain perception and antinociception this study was carried out to monitor the expression of NADPH-d in PAG after nociceptive visceral stimulation. Our data showed that the noxious visceral stimulation significantly increased NADPH-d positive neurons and that these neurons were localized in the ventrolateral areas of the PAG. These findings suggest that NO in the PAG may play a role in pain modulation and antinociception.
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