The Effect of Sex and Irritable Bowel Syndrome on HPA Axis Response and Peripheral Glucocorticoid Receptor Expression

Overview

Journal Psychoneuroendocrinology

Specialties Endocrinology
Neurology
Psychiatry

Date 2016 Apr 4

PMID 27038676

Citations 29

Authors

Elizabeth J Videlock

Wendy Shih

Mopelola Adeyemo

Swapna Mahurkar-Joshi

Angela P Presson

Christos Polytarchou

Melissa Alberto

Dimitrios Iliopoulos

Emeran A Mayer

Lin Chang

Affiliations

Soon will be listed here.

Abstract

Background And Aims: Dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis has been reported in irritable bowel syndrome (IBS). Enhanced HPA axis response has been associated with reduced glucocorticoid receptor (GR) mediated negative feedback inhibition. We aimed to study the effects of IBS status, sex, or presence of early adverse life events (EAL) on the cortisol response to corticotropin-releasing factor (CRF) and adrenocorticotropic hormone (ACTH), and on GR mRNA expression in peripheral blood mononuclear cells (PBMCs).

Methods: Rome III+ IBS patients and healthy controls underwent CRF (1μg/kg ovine) and ACTH (250μg) stimulation tests with serial plasma ACTH and cortisol levels measured (n=116). GR mRNA levels were measured using quantitative PCR (n=143). Area under the curve (AUC) and linear mixed effects models were used to compare ACTH and cortisol response measured across time between groups.

Results: There were divergent effects of IBS on the cortisol response to ACTH by sex. In men, IBS was associated with an increased AUC (p=0.009), but in women AUC was blunted in IBS (p=0.006). Men also had reduced GR mRNA expression (p=0.007). Cumulative exposure to EALs was associated with an increased HPA response. Lower GR mRNA was associated with increased pituitary HPA response and increased severity of overall symptoms and abdominal pain in IBS.

Conclusion: This study highlights the importance of considering sex in studies of IBS and the stress response in general. Our findings also provide support for PBMC GR mRNA expression as a peripheral marker of central HPA response.

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