Hypothalamic supraoptic nucleus (SON) neurons express nitric oxide synthase (NOS) in an activity-dependent manner. In the present study, the effect of aging on the NOS expression of the SON neurons, as detected by nicotinamide adenine dinucleotide phosphate-diaphorase activity, was studied under normal conditions and under dehydration stress induced by salt loading. In the control rats, the num...
