Further studies on the nature of the immunoreactive luteinizing hormone-releasing hormone (LH-RH)-like peptide in human urine.

The chemical nature of the immunoreactive LH-RH-like peptide found in human urine has been investigated using ion-exchange chromatography on carboxymethyl (CM)-cellulose and a radioimmunoassay for LH-RH. A single immunoreactive substance was found in urine after LH-RH administration and in urine samples from untreated subjects. This substance did not have the mobility of either the synthetic decapeptide nor the 3-10 octapeptide on CM-cellulose and the evidence suggests that it may be the 2-10 nonapeptide of LH-RH.