Characterization of the α-MSH-like immunoreactivity in blood and cerebrospinal fluid of the rat

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Abstract
We have investigated the nature of the α-melanocyte stimulating hormone-like immunoreactivity (α-MSH-LI) in blood and cerebrospinal fluid (CSF) of the rat. Blood and CSF from intact animals were subjected to high pressure liquid chromatography (HPLC) followed by a radioimmunoassay (RIA) specific for the C-terminal part of the α-MSH molecule. It appeared that in both body fluids the predomiant α-MSH-LI co-migrated with synthetic α-MSH and not with its des-acetyl or di-acetyl analogues. We conclude that α-MSH is the predominant form of α-MSH-LI circulating in plasma and CSF of rats from our Wistar strain.

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