GH response to oral and intravenous glucose load in acromegalic patients

A. Mancini, P. Zuppi, C. Fiumara, D. Valle, G. Conte, M. L. Fabrizi, C. Anile, G. Maira, L. De Marinis

Research output: Contribution to journalArticlepeer-review

Abstract

The lack of inhibition of Growth Hormone (GH) levels after glucose load is considered a marker of inappropriate GH secretion in acromegaly. In order to investigate the physiopathology of this phenomenon, we have studied the CH variations after an oral glucose load (0.75 g/kg BW per os, OGTT) or intravenous glucose bolus (25 g i.v., IVGTT), in a group of 12 acromegalic patients, aged 20 ± 69 yr (mean 48), 5 males and 7 females, with basal GH levels ranging from 11 to 76.2 ng/ml. The results indicate that only a group of acromegalic patients (group 1) had a partial CH inhibition after OGTT (mean decrease: 56.4 ± 4.2%), but in no patients GH levels were influenced by intravenous administration of glucose. It is possible that in group 1 patients, the gastroenteric response could partially influence the GH secretion by the pituitary tumor, probably due to an increased peripheral somatostatin release. The dissociation of the GH response to OGTT and IVTT could indicate a supersensitivity to peripheral somatostatin, related to a deficiency in central somatostatinergic tone and therefore represent a more unfavourable prognostic sign.

Original languageEnglish
Pages (from-to)322-325
Number of pages4
JournalHormone and Metabolic Research
Volume27
Issue number7
Publication statusPublished - 1995

Keywords

  • Acromegaly
  • GH
  • Pituitary
  • Somatostatin

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology

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