Abstract

Dynorphin B (DYN B) immunoreactivity was recently reported in a population of prolactin (PRL)-immunoreactive neurons of the rat lateral hypothalamus (LH). By coupling immunocytochemistry and in situ hybridization using two synthetic oligonucleotide probes complementary to DYN mRNA, a hybridization signal was observed over the neurons of the LH exhibiting both DYN- and PRL-like immunoreactivities. Our results clearly demonstrate that these neurons contain the mRNA encoding preproDYN and are able to synthesize authentic DYN B in colocalization with a peptide related to PRL.

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