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The effects of PHI-27, a peptide of the glucagon-secretion family, on luteinizing hormone (LH) release and on LH-releasing hormone (LH-RH)- or estradiol-induced LH release were examined in a sequential double chamber perifusion system by perifusing the pituitary alone or in sequence with the mediobasal hypothalamus (MBH) from normal female rats in diestrus. PHI at 10(-7) M had no significant effect on LH release from the pituitary in series with the MBH. Moreover, on perifusion of the pituitary alone with medium containing 10(-7) M PHI, LH release induced by 20 ng/ml LH-RH from the pituitary was not significantly different from that without PHI. Furthermore, PHI had no effect on estradiol-induced LH release from the pituitary in sequence with the MBH. These data indicate that PHI has no effect on LH release in vitro.

Absence of effect of the peptide PHI-27 on LH release in vitro.