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Exp Clin Endocrinol Diabetes 2012; 120(08): 477-481
DOI: 10.1055/s-0032-1321809
Article
© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

Glucocorticoid Receptor Density Correlates with Health Risk Factors and Insulin Resistance in Caucasian and African American Subjects

A. Islam
1   Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
,
Y. Chen
1   Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
,
M. Poth
1   Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
,
Z. P. Smith
1   Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
,
P. A. Deuster
1   Department of Military and Emergency Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814
› Author Affiliations
Further Information

Publication History

received 27 January 2012
first decision 03 April 2012

accepted 28 June 2012

Publication Date:
31 July 2012 (online)

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Abstract

Activation of the hypothalamic-pituitary-adrenal axis leads to secretion of cortisol, which binds to peripheral glucocorticoid receptor and mediates a complex series of metabolic and immune effects. Cortisol also binds to receptors in the hypothalamus and pituitary, and inhibits further secretion of adrenocorticotropic hormone thus preventing an excessive response. Excess glucocorticoid effect is seen in Cushings disease, adrenal adenomas/carcinomas and in glucocorticoid resistance. Within such pathology there are health consequences of excessive glucocorticoid action, including obesity, hypertension, and glucose intolerance or diabetes. We hypothesized that increased glucocorticoid receptor in peripheral tissue might mediate an excess glucocorticoid effect in the absence of increased cortisol secretion. The objective of the study was to investigate the relationship between glucocorticoid receptor density in leukocytes and health risk indices relevant to obesity and diabetes in a sample of Caucasian and African American subjects. Comparison of glucocorticoid receptor concentration with subject body mass index, percentage body fat, waist circumference, insulin resistance, plasma cortisol levels, gender, and lipid profiles were conducted. Increased glucocorticoid receptor density significantly correlated with body mass index, percentage body fat, waist circumference, and insulin resistance. No significant correlation was observed for glucocorticoid receptor density with lipid profiles. Furthermore, no significant differences were observed in glucocorticoid receptor density between Caucasian and African American subjects or male and female participants. Our results show that high risk health conditions, such as obesity and type-2 diabetes, may be associated with a form of hypothalamic-pituitary-adrenal axis dysfunction, characterized by localized leukocyte glucocorticoid receptor over-expression.

Key words

glucocorticoid receptor - insulin resistance - leukocyte
 

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