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Antiviral Pathway Deregulation of Chronic Fatigue Syndrome Induces Nitric Oxide Production in Immune Cells that Precludes a Resolution of the Inflammatory Response

  [ 208 votes ]   [ 1 Comment ]
By Marc Fremont, et al • www.ProHealth.com • November 1, 2006


Journal: Journal of Chronic Fatigue Syndrome. Vol. 13(4) 2006 pp. 19-30. [Published online ahead of print. Article copies are available for a fee from The Haworth Document Delivery Service: 1-800-HAWORTH. E-mail address: docdelivery@haworthpress.com ; Website: http://www.HaworthPress.com.]
Authors and affiliations: Marc Frémont,1 Freya Vaeyens,1 C. Vincent Herst,1 Kenny De Meirleir,2 Patrick Englebienne.3 1) RED Laboratories, Zellik, Belgium; 2) Vrije Universiteit Brussel, Brussels, Belgium; 3) Universite Libre de Bruxelles, Brussels, Belgium. Correspondence to Patrick Englebienne. DOI: 10.1300/J092v13n04_03

Chronic fatigue syndrome (CFS) is a poorly defined medical condition diagnosed by exclusion, which, besides severe chronic fatigue as the hallmark symptom, involves inflammatory and immune activation stigma. Although viral infections are not systematically found in CFS patients, the type I interferon antiviral pathway has been repeatedly shown to be activated in peripheral blood mononuclear cells (PBMC) of the most afflicted patients. An abnormal truncated form of ribonuclease L (37-kDa RNase L) is also found in the PBMC of CFS patients and this protein has been proposed as a biological marker for CFS. Recently, the levels of this abnormal protein have been significantly correlated to the extent of inflammatory symptoms displayed by CFS patients.

We report here that active double-stranded RNA-dependent kinase (PKR) is expressed and activated in parallel to the presence of the 37-kDa RNase L and to an increase in nitric oxide production by immune cells. However, PKR upregulation results also in a significant increase followed by a decrease in caspase 3 activity for the samples containing the highest levels of 37-kDa RNase L. This caspase 3 downregulation does not result from increased expression of the anti-apoptotic proteins Bcl-2 and Bcl-XL.

These results therefore suggest that chronic inflammation due to excess nitric oxide production plays a role in CFS and that the normal resolution of the inflammatory process by NF-KB activation and apoptotic induction is impaired. These observations draw new directions for the therapeutic approach of CFS.

KEYWORDS. RNase L pathway, nitric oxide, PKR, chronic inflammation.




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Article Comments Post a Comment

What is nitric oxide?
Posted by: findmind
Nov 4, 2006
If increased nitric oxide is causing an ongoing inflammatory process, can anyone explain it in laymen's terms? What would be a supplemental solution, and what would be an allopathic treatment? Thanks, appreciate it!
Reply Reply
 
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