Distribution and possible origin of β-endorphin and ACTH in discrete brainstem nuclei of rats

M Palkovits, RL Eskay - Neuropeptides, 1987 - Elsevier
Immunoreactive ACTH and β-endorphin in the lower brainstem nuclei of intact and
brainstem-hemisected rats were quantified by radioimmunoassay. The distribution of these
peptides was almost identical throughout the lower brainstem. The concentrations of ACTH
and β-endorphin were essentially equal when expressed on a molar basis. Both peptides
were distributed unevenly in the lower brainstem. High concentrations were found in the
periaqueductal central gray matter and the dorsal raphe nucleus, and moderate levels were …