Abstract
In the present paper the development and application of a novel melanin concentrating hormone radioimmunoassay and receptor-binding assay are described. 125I-labeling of melanin concentrating hormone (MCH) was performed by iodogen and the mono-iodinated peptide was separated by reversed-phase high performance liquid chromatography. Detection limit of the MCH specific assay was 0.2 fmol/ml. As a practical application of the novel radioimmunoassay, we measured the MCH concentration in different rat organs. High MCH concentrations were detected in the small intestine, pancreas, kidney, liver, trachea, hypothalamus and spinal cord. 125I-MCH was also suitable for RBA to demonstrate the presence of MCH receptors in the rat brain.
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