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Influence of synthetic thyrotropin-releasing hormone tartrate monohydrate on plasma gonadotropin concentration of normal males.

Synthetic thyrotropin-releasing hormone (TRH) tartrate monohydrate was administered by rapid intravenous injection to nine normal males. Plasma thyroid-stimulating hormone (TSH), luteinizing hormone (LH) and follicle-stimulating hormone (FSH) were measured before and at selected periods after TRH injection. The mean plasma TSH value immediately prior to TRH injection was 3.5 muU/ml and the level 15 min after injection was 14.8 muU/ml. The mean plasma LH value immediately prior to TRH injection was 8.0 mIU/ml and the level 15 min after injection was 15.0 mIU/ml. The latter elevation was statistically significant (p less than 0.01), although it was just above the upper normal range. The mean plasma FSH value immediately prior to TRH injecion was 7.7 mIU/ml, and a significant difference was not observed after TRH administration. These results revealed that synthetic TRH tartrate monohydrate influenced the release of LH from the anterior pituitary.