PGlu-3-methyl-His-Pro-NH2 TFA enhances binding to pituitary TRH receptors, thereby increasing the stimulation of thyroid-stimulating hormone (TSH) release from the pituitary.
TSHR antagonist S37b, the less potent enantiomer of TSHR antagonist S37a, exhibits minimal efficacy in inhibiting the thyrotropin receptor (TSHR). It is utilized in thyroid function research[1].