Change in Somatostatinergic Tone of Acromegalic Patients according to the Size of Growth Hormone-Producing Pituitary Tumors.
10.3346/jkms.2013.28.12.1774
- Author:
Sang Ouk CHIN
1
;
Suk CHON
;
You Cheol HWANG
;
In Kyung JEONG
;
Seungjoon OH
;
Sung Woon KIM
Author Information
1. Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea. igf1@unitel.co.kr
- Publication Type:Original Article
- Keywords:
Acromegaly;
Growth Hormone;
Somatostatinergic Tone;
Pituitary Gland;
Macroadenomas
- MeSH:
Acromegaly/*diagnosis/*pathology;
Adenoma/drug therapy/*pathology;
Adult;
Aged;
Antineoplastic Agents, Hormonal/therapeutic use;
Female;
Glucose Tolerance Test;
Human Growth Hormone/*blood/secretion;
Humans;
Insulin/blood;
Insulin-Like Growth Factor I/analysis;
Male;
Middle Aged;
Octreotide/therapeutic use;
Pituitary Neoplasms/drug therapy/*pathology
- From:Journal of Korean Medical Science
2013;28(12):1774-1780
- CountryRepublic of Korea
- Language:English
-
Abstract:
The aim of this study was to investigate the relationship between somatostatinergic tone (SST) and the size of growth hormone (GH)-producing pituitary tumors. GH levels of 29 patients with newly diagnosed acromegaly were measured using a 75-gram oral glucose tolerance test (OGTT), an insulin tolerance test (ITT), and an octreotide suppression test (OST). Differences between GH levels during the ITT and the OGTT (DeltaGH(IO)), and between the OGTT and the OST at the same time point (DeltaGH(OS)) were compared according to the size of the tumor and the response pattern to the OST. DeltaGH(IO) of macroadenomas (n=22) was non-significantly higher than those of microadenomas while DeltaGH(OS) of macroadenomas were significantly higher than those of microadenomas. According to further analyses of macroadenomas based on the response pattern to the OST, GH levels during the ITT were significantly higher in non-responders. DeltaGH(OS) showed near-significant differences between responders and non-responders. In conclusion, as the size of the pituitary tumor increases, the effect of glucose on SST appears to be attenuated. Macroadenomas that are non-responders to the OST possess a portion of GH secretion exceeding the range of regulation by SST.
