Abstract
Decreased immunoreactivity has been reported for several neuropeptides in the aged suprachiasmatic nucleus (SCN). We compared somatostatin (SS) and substance P (SP) immunoreactivity (ir) in aged (20–26 months) and young (6 months) Wistar rats. The old rat SCN revealed a significant increase in SSir (2.6-fold) and SPir. The results show that not all SCN–neuropeptidergic systems decline with age, and suggest a specific age-related role for SS in the SCN.
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