Inhibitory effect of the somatostatin analog octreotide on rat pituitary tumor cell (GH3) proliferation in vitro

G. Pelicci, M. C. Pagliacci, L. Lanfrancone, P. G. Pelicci, F. Grignani, Ildo Nicoletti

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The effects of somatostatin-14 (SS-14) and the somatostatin-analog octreotide (SMS 201-995, Sandostatin) on proliferation of GH3 pituitary tumor cells were investigated in vitro. SMS 201-995 exerted a significant, but transient, inhibition on GH3 cell growth which reached a maximum at 24 h and was no longer detectable at 48 h. The concentration that evoked the strongest inhibitory effect was 10 nM SMS 201-995, while lower and higher doses resulted in a less pronounced effect. The inhibitory effect SMS 201-995 exerted on cell proliferation was associated with a dose- and time-related reduction in both c-myc and c-fos mRNA levels. SS-14 had no noteworthy influence on either cell proliferation or c-myc and c-fos protooncogene expression. These data demonstrate that SS-analogs transiently inhibit pituitary tumor cell proliferation in vitro.

Original languageEnglish
Pages (from-to)657-662
Number of pages6
JournalJournal of Endocrinological Investigation
Issue number8
Publication statusPublished - 1990



  • cell proliferation
  • GH cells
  • octreoide
  • protooncogenes
  • somatostatin

ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

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