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Sex Differences in Plasma Prolactin Response to Tryptophan in Chronic Fatigue Syndrome Patients With and Without Comorbid Fibromyalgia - Source: Journal of Womens Health (Larchmt), Apr 12, 2010

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By Shelley A Weaver, Benjamin H Natelson, et al. • www.ProHealth.com • April 14, 2010


[Note: though we await a plain-language explanation of these technical findings, it's apparent that they may be an important step in understanding ME/CFS/FM and their (possibly) greater incidence in females.]

Background: Some think chronic fatigue syndrome (CFS) and fibromyalgia (FM) are variants of the same illness process.

This would imply that CFS patients with and without comorbid FM have similar biological underpinnings.

To test this, we compared serotonergic-based responses, plasma prolactin (PRL), and self-reported measures of fatigue to intravenous infusion of tryptophan among patients with CFS alone, CFS + FM, and healthy controls.

Methods: Men and women with CFS alone or CFS + FM and healthy subjects, none with current major depressive disorder (MDD), were given 120 mg of l-tryptophan per kg lean body mass intravenously (i.v.).

Before and after tryptophan infusion, blood samples were collected, and plasma PRL, tryptophan, and kynurenine concentrations were determined.

Results:

• Women with CFS alone, but not CFS + FM, showed upregulated plasma PRL responses compared with controls.

• There were no differences among groups of men.

• Plasma tryptophan and kynurenine concentrations did not differ among groups.

Conclusions:

• These results indicate that women with CFS alone have upregulated serotonergic tone that is not seen in those with comorbid FM.

• The lack of effect in men suggests a mechanism that might explain, in part, the increased prevalence of CFS in women.

The data support the interpretation that CFS in women is a different illness from FM.

Source: Journal of Womens Health (Larchmt), Apr 12, 2010;19(5). PMID: 20384451, by Weaver SA, Janal MN, Aktan N, Ottenweller JE, Natelson BH. Department of Neurology & Neurosciences, Pain & Fatigue Study Center, and Department of Psychiatry, UMDNJ-New Jersey Medical School, Newark, New Jersey, USA.





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