Julia Newton’s group at Newcastle University found reduced mitochondria function [6] in both severely and moderately affected patients. Interestingly, they found “disease severity does not correlate with mitochondrial function and even those with a moderate form of the disease show evidence of mitochondrial dysfunction.” This means the mitochondria function is more like a switch flipped for all patients than a gradient of effect or finding only in a subset. However, severely affected patients did have greater respiratory acidification due to impairments in glycolysis not seen in moderate ones. A straightforward interpretation would be impairment to mitochondrial function is a prerequisite for disease but that downstream effects of disease can impair vital cellular processes like glycolysis.

Another new study by Bhupesh Prusty of the University of Wurzburg, and UCSD’s Robert Naviaux has found that mitochondria from ME patients show dramatic fragmentation in comparison to controls [7][8].

In an experiment with culture cells with latent HHV-6 (containing Human Herpesvirus 6 DNA–but not actual virus particles) chemical reactivation of HHV-6 resulted in the production of several viral RNAs but not major viral proteins. Significantly, Prusty and Naviaux found HHV-6 reactivation induced mitochondrial fragmentation, oxidative changes, and decreased antiviral resistance. When fluid from the cell culture of the HHV-6 reactivated cells was transferred to a new group of cells (not exposed to HHV-6), mitochondrial fragmentation and oxidative changes also occurred in these cells but with increased antiviral resistance! [8]

The last experiment involved transferring not HHV-6 infected cell culture fluid but rather blood serum from ME patients to new cells. This serum transfer induced an identical state of mitochondrial fragmentation, oxidative change, and antiviral resistance! These experiments show that one or more molecule types induced by HHV-6 reactivation are secreted to the outer fluid and can function to induce mitochondrial fragmentation, oxidative changes, and antiviral properties in distant cells. Not only that, but the serum of ME patients acts in exactly this manner (suggesting we have a molecular factor(s) in our blood similar, or the same as, that secreted by the HHV-6 reactivated cells–and which is causing harmful changes to our mitochondria).

A common thread to mitochondrial findings by both Davis and Prusty is the presence of a serum factor, or factors, which could be transferred to the cells of healthy people and inflict the ME cells’ phenotype on well cells. How far this commonality extends (for instance whether serum factor(s) found in Davis’s impedance study is the same as the factor(s) found in Prusty’s study of mitochondrial fragmentation) is currently unknown.

There are two main implications:

1. As a blood serum factor, or factors, is sufficient to induce a damaged, low-energy state this state may be reversible if this factor–or its causes–can be blocked or removed from the organism.
2. As widespread mitochondrial fragmentation is sufficient to cause a body-wide low energy state, using the principle of only invoking needed changes (Parsimony Principle) it makes sense to assume this fragmentation, and cellular-energetic loss, is part of the core disease mechanism in ME.

One of the exciting aspects of mitochondrial research is, given the pervasive impact of mitochondrial health on the cell, a deeper understanding of many earlier abnormal discoveries and observations may be gained through understanding the abnormalities of mitochondria in ME.

Some of the most precocious intra-cellular findings stem from the finding of an abnormal, cleaved, 37 kiloDalton RNase L and dramatic reduction in actin in patients’ cells by the late Robert Suhadolnik [9]. In “Chronic Fatigue Syndrome: a biological approach” [10], by Kenny De Meirleir and colleagues, these findings are expanded into a panoply of intra-cellular dysregulation including defective activation of RNase L by 2-5-A dimers produced by 2-5’A oligoadenylate synthetase, cleavage of Rnase L by m-calpain, and abnormalities in the cell state reminiscent of incompletely induced apoptosis (an essential cell disposal process culminating in cell death). Given the role of mitochondria in both cellular energy and apoptosis, it is hoped that the mitochondrial fragmentation research and antiviral induction research can explain the significance of these findings in a panoramic manner.

One indicator of scientific progress is the ability to place important observations in a single theoretical framework. The findings of induction of mitochondrial fragmentation and a cellular viral resistance state by patient serum could explain one such finding: the impairment of pyruvate dehydrogenase found by Fluge and Mella of Haukeland University, Norway. Prusty’s findings indicated that the mitochondrial fragmentation (caused by both patient serum and HHV-6 infected cell supernatant) potently impaired this very complex!

However starved our own mitochondria may be, this is a very exciting time for mitochondria research in ME and we must ensure these researchers are not starved of funding!