High concentration of thyrotropin-releasing hormone in pancreatic islets
The concentration of thyrotropin-releasing hormone (TRH, thyroliberin) in rat islets of Langerhans is 30-fold higher than in whole rat pancreas, indicating that the islets are the main source of pancreatic TRH. The TRH extracted from islets is indistinguishable from synthetic TRH in its immunological and biological properties and in its inactivation by human serum. The physiologic function of isle