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-endorphin by the spleen
Veterans Affairs Medical Center and Tulane University School of Medicine, New Orleans, Louisiana 70146
The blood-brain
barrier (BBB) regulates the passage of substances between the brain and
the periphery. It has not been shown that the secretion from the brain
of a small amount of a substance can directly affect the periphery by
transport across the BBB. We found that central injection of
radioactively labeled corticotropin-releasing hormone (CRH) resulted in
the accumulation of intact CRH in the spleen. CRH also increased
splenic
-endorphin, an effect not blocked by pretreatment with
dexamethasone. Inhibition of the secretion of CRH from the brain by
colchicine resulted in decreased accumulation of CRH in the spleen and
also decreased splenic
-endorphin. Similar findings occurred in the
pituitary gland. The results show that the passage of labeled CRH from
the brain can directly affect a peripheral organ, thus emphasizing the
regulatory function of the BBB.
corticotropin-releasing hormone; blood-brain barrier; neuroimmunology; peptides
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