Erschienen in:
01.02.2015
The clinical and cardiometabolic effects of d3-growth hormone receptor polymorphism in acromegaly
verfasst von:
Nese Cinar, Selcuk Dagdelen, Hikmet Yorgun, Ugur Canpolat, Giray Kabakçı, Tomris Erbas
Erschienen in:
Pituitary
|
Ausgabe 1/2015
Einloggen, um Zugang zu erhalten
Abstract
Purpose
Exon 3-deleted GH receptor variant (d3-GHR) is associated with increased responsiveness to exogenous GH. The aim of this study was to determine the effect of d3-GHR polymorphism on the GH/IGF-1 relationship, clinical parameters, and comorbidity in acromegalic patients.
Methods
The study included 118 acromegalic patients (61 female and 57 male; mean age: 50.3 ± 12.2 years) and 108 healthy controls (94 female and 14 male: mean age: 41.1 ± 11.1 years). The prevalence of GHR genotypes was evaluated via PCR.
Results
In all, 71 (60.2 %) patients had the fl/fl-GHR genotype, 40 (33.9 %) were heterozygous for the fl/d3-GHR genotype, and 7 (5.9 %) were homozygous for the d3/d3-GHR genotype. The prevalence of fl/fl-GHR, fl/d3-GHR, and d3/d3-GHR genotypes in the control group was 57.4, 29.6, and 13.0 %, respectively—similar prevalences as in the patient group. Patients that were heterozygous and homozygous for the d3 allele were subgrouped (d3-GHR subgroup), and were compared to those with the fl/fl-GHR genotype (fl/fl-GHR subgroup). Anthropometric measures, features of pituitary adenoma, and baseline GH and IGF-1 levels were similar in both subgroups. The prevalence of coronary artery disease, hypertension, hyperlipidemia, type 2 diabetes mellitus, and multinodular goiter did not differ between patient subgroups. In total, 24 (20.3 %) of the patients had cancer and the prevalence of cancer was similar in the d3-GHR (14.9 %) and fl/fl-GHR (23.9 %) subgroups (P = 0.23). More of the acromegalic patients that were d3 carriers had discordant GH and IGF-1 levels at baseline and post surgery, but the difference was not significant. A significant correlation between basal GH and IGF-1 levels was observed only in the patients with the fl/fl-GHR genotype (R2 = 0.227, P < 0.001).
Conclusion
The d3-GHR variant genotype did not have an effect on clinical features or comorbidity in acromegalic patients, but it might play a role in GH/IGF-1 level discordance in acromegaly.