We have examined the distribution of pituitary adenylate cyclase-activating polypeptide (PACAP) type I receptor gene expression in the rat paraventricular (PVN) and supraoptic nuclei (SON) using in situ hybridization histochemistry. PACAP type I receptor gene was expressed moderately in the whole area of the PVN and the SON. In particular, PACAP type I gene transcripts were found in both the magnocellular and the parvocellular parts of the PVN. The results are consistent with the hypothesis that neurosecretory cells in the PVN and the SON might be modulated by PACAP through PACAP type I receptor.
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Nomura et al. (1996) studied this question.
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