Abstract
Distribution of prolactin-releasing peptide-like immunoreactivity (PrRP-LI) was investigated in the rat medulla with the use of a rabbit polyclonal antiserum against the human PrRP-31 peptide. PrRP-positive neurons were noted mainly in two areas of the caudal medulla: ventrolateral reticular formation and commissural nucleus of the nucleus of the solitary tract (NTS), corresponding to the A1 and A2 areas. PrRP-LI neurons were absent in the medulla rostral to the area postrema. Double-labeling the sections with PrRP antisera and tyrosine hydroxylase (TH) monoclonal antibodies revealed extensive colocalization of PrRP- and TH-like immunoreactivity (TH-LI) in neurons of the A1 and A2 areas. Our results show that PrRP-LI is expressed in a population of A1 and A2 noradrenergic neurons of the rat caudal medulla.
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