LH and FSH responses to agonists of NK1R (GR73632) and NK2R (GR64349) in adult rats. Effects of acute icv administration of the agonists of tachykinin receptors, NK1R (NK1R-A, GR73632) and NK2R (NK2R-A, GR64349), on LH and FSH release in adult female (in D1; A and B) and male (C and D) rats. NK1R-A (600 pmol) or NK2R-A (600 pmol) were acutely icv injected and blood samples for hormone determination were taken before (0 minute) and at 20, 60, and 120 minutes after injection of the compounds; animals injected with vehicle (VEH) served as controls. Groups with different superscript letters are statistically different (P ≤ .05), as estimated by a two-way ANOVA followed by a Tukey post hoc test.