Inhibition of growth of a prolactin-secreting pituitary tumor in rats by analogs of luteinizing hormone-releasing hormone and somatostatin

M. G. de Quijada, T. W. Redding, D. H. Coy, I. Torres-Aleman, A. V. Schally

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Abstract

We investigated the effects of [D-Trp6]LH-RH [agonistic analog of luteinizing hormone-releasing hormone (LH-RH)], N-Ac-[D-p-Cl-Phe1,2,D-Trp3,D-Phe6,D-Ala10]LH-RH (antagonistic analog), and [D-5-methoxy-Trp8]somatostatin (somatostatin analog) on the growth of the prolactin and corticotropin-secreting pituitary tumor 7315a in female Buffalo rats. Chronic administration of [D-Trp6]LH-RH in a dose of 25 μg/day, starting 18 days after inoculation with the tumor, inhibited the growth of the pituitary tumor. Tumor weight and volume also were reduced when this agonist was administered 3 days after inoculation. The antagonistic LH-RH analog, injected in a dose of 50-100 μg for 14-24 days, also significantly inhibited the growth of pituitary tumor. Chronic administration of the somatostatin analog in a dose of 25 μg twice a day likewise decreased tumor weights in comparison with controls. The inhibition of pituitary tumor growth by LH-RH agonist, LH-RH antagonist, and somatostatin analog was accompanied by a decrease in serum prolactin levels. It was concluded that LH-RH agonist, LH-RH antagonist, and somatostatin analog can inhibit the growth of estrogen-dependent prolactin/corticotropin-secreting pituitary tumor in rats.

Original languageEnglish (US)
Pages (from-to)3485-3488
Number of pages4
JournalUnknown Journal
Volume80
Issue number11 I
DOIs
StatePublished - 1983

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