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Naloxone-mediated activation of the hypothalamic-pituitary-adrenal axis inchronic fatigue syndrome.

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By Scott LV, Burnett F, Medbak S, Dinan TG • www.ProHealth.com • March 1, 1998


BACKGROUND: Opioidergic pathways have an inhibitory regulatory influence on the hypothalamic-pituitary-adrenal axis (HPA) in man. Previous studies have suggested impairment of pituitary-adrenal activation in chronic fatigue syndrome (CFS). We, therefore, decided to investigate the extent of opioid inhibition of HPA activity in CFS as a possible explanation for the reputed HPA hypofunctioning in patients with CFS.

METHOD: Thirteen patients with CFS, diagnosed according to CDC criteria, were compared with thirteen healthy subjects. Adrenocorticotropin (ACTH) and cortisol (CORT) responses were measured following the administration of the opiate antagonist naloxone.

RESULTS: Baseline ACTH and cortisol levels did not differ between the two groups. The release of ACTH (but not cortisol) was significantly blunted in the CFS subjects compared with controls.

CONCLUSIONS: Naloxone mediated activation of the HPA is attenuated in CFS. Excessive opioid inhibition of the HPA is thus an unlikely explanation for the HPA dysregulation in this disorder.

Source:
Psychol Med 1998 Mar;28(2):285-93.
Department of Psychological Medicine, St Bartholomew's and the Royal London School of Medicine.

PMID: 9572086, UI: 98233613




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