title: TRH and TRH-OH in the pancreas of adult and newborn rats.
abstract: TRH and its metabolite TRH-OH have been measured by specific radioimmunoassays in acid extracts of pancreas in adults and developing rats. TRH and TRH-OH immunoreactivity had the same ontogenic pattern with a maximal concentration on day 4 followed by a progressive return towards adult levels on day 20. A significant linear correlation was found between TRH levels and the TRH/TRH-OH ratio. The range of TRH/TRH-OH ratio varied from 136 +/- 1.6, at the peak of concentrations of both peptides, to 18 +/- 3.9 on day 20. Pancreatic TRH and TRH-OH had the same elution pattern as corresponding synthetic peptides both on Biogel P2 and high-pressure liquid chromatography. The origin of TRH-OH as well as its potential function need further investigations.
mesh_terms: D000367:Age Factors; D000596:Amino Acids / Q000276:immunology; D000818:Animals; D000831:Animals, Newborn; D000918:Antibody Specificity; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003429:Cross Reactions; D010179:Pancreas / Q000032:analysis* / Q000254:growth & development; D010455:Peptides / Q000276:immunology; D011761:Pyrrolidonecarboxylic Acid / Q000031:analogs & derivatives; D051381:Rats / Q000254:growth & development / Q000378:metabolism; D013973:Thyrotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000032:analysis* / Q000276:immunology
chemical_list: D000596:Amino Acids; D010455:Peptides; C020271:thyrotropin-releasing hormone, deamido-; D013973:Thyrotropin-Releasing Hormone; D011761:Pyrrolidonecarboxylic Acid