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Human Reproduction, Vol. 10, No. 7, pp. 1653-1657, 1995
© 1995 European Society of Human Reproduction and Embryology

research-article

Endocrinology: The growth hormone response to growth hormone-releasing hormone is blunted in polycystic ovary syndrome: relationship with obesity and hyperinsulinaemia

A. Lanzone2, P. Villa1, A.M. Fulghesu1, V. Pavone1, A. Caruso1 and S. Mancuso1,3

1Department of Obstetrics and Gynaecology, Catholic University of Sacred Heart Rome 2Oasi Institute for Research Troina, Italy

Correspondence: 3To whom correspondence should be addressed

This study was designed to investigate the growth hormone (GH) secretory response to the growth hormone-releasing hormone (GHRH) test in women with polycystic ovary syndrome (PCOS). A total of 25 patients with PCOS (13 obese and 12 non-obese) and 15 normal ovulatory women (seven obese and eight non-obese) were included in this study. In the follicular phase patients were subjected to an oral glucose tolerance test (OGTT); 2 days later they underwent a GHRH test. Basal plasma concentrations of gonadotrophins, steroids and sex hormone-binding globulin were measured. Insulin and GH were assayed under the OGTT and GHRH test respectively. Based on the insulin response to OGTT in the PCOS group, nine patients were classified as normoinsulinaemic and 16 as hyperinsulinaemic; none of the patients of the control group had a hyperinsulinaemic response to OGTT. Obese patients showed a trend towards a lower GH response to GHRH. Moreover, hyperinsulinaemic patients showed a significantly (P < 0.05) lower area under the curve for secretion of GH (AUC-GH) as compared to normoinsulinaemic patients. All PCOS patients exhibited a markedly decreased response of GH to GHRH compared with the control population. Obese and hyperinsulinaemic PCOS patients were both found to have a lower response of GH to GHRH than all other groups. Despite the fact that obesity and hyperinsulinaemia have an additive influence on the impairment of GH secretion, our results suggest that other factors may also negatively affect GH secretion in PCOS.

Key words: GH/GHRH test/insulin resistance/obesity/PCOS


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