COLOCALIZATION OF PROLACTIN-LIKE AND DYNORPHIN-LIKE SUBSTANCES IN A NEURONAL POPULATION OF THE RAT LATERAL HYPOTHALAMUS

Using an antiserum (AS) raised against dynorphin B (DYN B), we reveale d immunoreactive neurons in different nuclei of the rat hypothalamus a s well as a population of neurons scattered in the lateral areas of th e posterior hypothalamus. This population corresponds to that previous ly shown to be specifically recognized by an ovine prolactin (PRL) AS. Our results suggest that in these neurons, DYN B and PRL AS reacted w ith different epitopes and that these epitopes could be carried by dis tinct unidentified peptides.