Abstract
The earlier described age-related decreases in vasopressin innervation of extra-hypothalamic rat brain regions were found to coincide with a decrease in vasopressin expression in the cells where these fibers originated. A significant age-related decrease in the number of vasopressin-immunoreactive cell bodies was found in the medial amygdala and locus coeruleus of senescent Brown-Norway (BN/BiRij) rats (33 months) when compared to middle-aged (19 months) and young (3 months) rats. In addition, total testosterone plasma levels were significantly reduced in middle-aged and old rats as compared to young animals and the number of vasopressin-immunoreactive cells in both the medial amygdala and locus coeruleus correlated significantly with the decreased testosterone levels in a similar way as found earlier for vasopressin terminals.
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