Study Confirms Decreases in Immune Function in CFS/ME Patients, Suggests Biomarker
via ProHealth.com • February 21, 2013
Editor’s Note: Natural killer (NK) cells are part of our body’s innate immune system. Their primary function is to reject tumor and virus infected cells. They do this by releasing granzyme and perforin, which are small protein granules that target cells to be destroyed. This process is called apoptosis or programmed cell death.
Longitudinal investigation of natural killer cells and cytokines in chronic fatigue syndrome/myalgic encephalomyelitis
~Source: J Transl Med. 2012; 10: 88
By Ekua W. Brenu et al.
Background: Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) is an etiologically unexplained disorder characterised by irregularities in various aspects of the immunological function. Presently, it is unknown whether these immunological changes remain consistent over time. This study investigates Natural Killer (NK) cell cytotoxic activity, NK cell subsets (CD56 bright CD16- and CD56 dim CD16+) and cytokines, over the course of a 12-month period in patients with CFS/ME.
Methods: The participants in the study comprised 65 (47.2 ± 11.5 years) CFS/ME participants and 21 (45.2 ±9.3 years) non-fatigued controls. Flow cytometry protocols were used to assess NK subsets and NK cytotoxic activity at various time points that included baseline (T1), 6 (T2) and 12 months (T3). Cytokine secretions were measured following mitogenic stimulation of peripheral blood mononuclear cells.
Results: NK cytotoxic activity was significantly decreased in the CFS/ME patients at T1, T2 and T3 compared to the non-fatigued group. Additionally, in comparison to the non-fatigued controls, the CFS/ME group had significantly lower numbers of CD56 bright CD16- NK cells at both T1 and T2. Interestingly, following mitogenic stimulation, cytokine secretion revealed significant increases in IL-10, IFN-gamma and TNF-alpha at T1 in the CFS/ME group. A significant decrease was observed at T2 in the CFS/ME group for IL-10 and IL-17A while at T3, IL-2 was increased in the CFS/ME group in comparison to the non-fatigued controls. Overall cytotoxic activity was significantly decreased at T3 compared to T1 and T2. CD56 bright CD16- NK cells were much lower at T2 compared to T1 and T3. IL-10 and IL-17A secretion was elevated at T2 in comparison to T1 and T3.
Conclusion: These results confirm decreases in immune function in CFS/ME patients, suggesting an increased susceptibility to viral and other infections. Furthermore, NK cytotoxic activity may be a suitable biomarker for diagnosing CFS/ME as it was consistently decreased during the course of the 12 months study
Source: J Transl Med. 2012; 10: 88 doi: 10.1186/1479-5876-10-88. Ekua W Brenu, Mieke L van Driel, Donald R Staines, Kevin J Ashton, Sharni L Hardcastle, James Keane, Lotti Tajouri, Daniel Peterson, Sandra B Ramos, and Sonya M Marshall-Gradisnik.
Booth, Myhill, McLaren-Howard Comment on ME/CFS Mitochondrial Dysfunction Paper
By Norman E. Booth, Sarah Myhill, John McLaren-Howard • ProHealth.com • July 4, 2012
Source: Press Release, July 4, 2012
Dr. Norman E. Booth, Dr. Sarah Myhill and Dr. John McLaren Howard are pleased to announce the publication of a second paper concerning the link between mitochondrial dysfunction and ME/CFS. [“Mitochondrial Dysfunction and the pathophysiology of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)", published June 30, 2012]
In 2009 we published our first paper looking at mitochondrial function in ME/CFS patients. What we found is that those patients with the worst mitochondrial function had the worst levels of fatigue and vice versa. There was a very clear relationship between the two. The importance of this paper was that it gave backing to certain treatment interventions and also that it clearly established ME/CFS as a physical condition with physical causes. The mitochondrial function can be used as an objective assessment of fatigue and of course this has obvious practical implications.
Hitherto any assessment of the level of disability had to be subjective and this created great difficulties for patients in cases where their physicians disbelieved the serious nature of their symptoms. For a detailed explanation of the clinical issues please see http://www.drmyhill.co.uk/wiki/CFS_-_The_Central_Cause:_Mitochondrial_Failure.
This second paper further explores the above ideas. In this second paper the size of the patient group is much larger with 138 ME/CFS patients involved. Their mitochondrial function tests were compared with 53 normal healthy controls.
The findings of the first paper were repeated and confirmed, but the analysis of this second paper was carried out slightly differently.
It was found on careful inspection of the biochemistry that there were various sub-groups of ME/CFS patients with their own characteristic biochemical pattern. In particular, one of the five parameters measured, namely translocator protein function IN, can be higher as well as lower for patients as compared with controls.
This second paper also attempts to explain what is happening at the biochemical level to result in such an abnormality.
To this end, Dr. Booth provides an alternative method of assessing mitochondrial function. He noticed that the percentage inhibition of ATP closely correlates with TL-in factor – this is probably because the biochemistry of these two measured quantities is so closely associated.
So instead of using TL-in to calculate the mitochondrial energy score, he used percentage ATP inhibited – this provided a solution to the problem of translocator protein IN being higher in some patients than in controls, a factor which in itself is abnormal.
Dr. Booth then went on to plot the relationship between mitochondrial energy score and the number of factors within the normal region to achieve an extremely close correlation.
Importantly this test identifies a clean separation between the ME/CFS cases and the healthy controls.
So this first part of the paper very much confirms the work of the first paper published in 2009 which is that those patients with the worst ME/CFS had the worst mitochondrial function and vice versa.
It must be remembered that patients attending a clinic for ME/CFS are usually the most severely fatigued – no mildly ill patients were tested. Within these limitations the ATP profile is an exclusive and sensitive test for ME/CFS. However, we cannot claim that it is specific to ME/CFS because there are many other neurological illnesses and metabolic syndrome also associated with mitochondrial dysfunction.
Dr. Booth went on to analyze sub-groups within the main group.
When mitochondria are stressed, i.e., energy demand exceeds energy delivery, in the short term they can switch into an alternative means of making ATP, of which there are 2 possibilities identified. Dr. Booth called these patients cohort 1 and cohort 2.
• In cohort 1, the mitochondria switch into anaerobic metabolism with increased glycolosis in order to produce ATP.
• In cohort 2 there was an alternative process to supply additional ATP. This alternative process involves the adenylate kinase reaction in which two molecules of ADP combine to make one of ATP and one of AMP. The problem with this reaction is that for every molecule of ATP generated, so is one of AMP. This is not recycled, but mainly lost in the urine. So there may be short term metabolic benefits here, but in the longer term metabolic disaster ensues as the energy molecules literally leak away. It takes time to replace these leaked molecules of ADP (leaked in the form of a ‘lost’ AMP molecule) and so this may explain one of the clinical features of ME/CFS, namely delayed fatigue.
A vital feature of ATP studies is that they identify the mechanisms by which mitochondria ‘go slow’. Essentially they can ‘go slow’ for one of three common reasons:
• Either there is substrate deficiency, i.e. lack of essential co-factors for mitochondria to work such as Co-enzyme Q10, magnesium, vitamin B3, or acetyl-L-carnitine,
• Or secondly, because mitochondria are blocked by toxins. Typically the blockage can be of oxidative phosphorylation and/or translocator protein function. Dr. John McLaren Howard has developed several further tests to look at the nature of these blockages. These tests include microrespirometry studies, translocator protein function studies, intracellular calcium studies and so on.
• The third possible mechanism for mitochondria malfunctioning has to do with membrane function. The membranes of mitochondria need to be of just the right consistency in order to hold the bundle of enzymes in the correct 3D configuration to allow efficient movement of substrate from one enzyme complex to another. To this end, again Dr. John McLaren Howard has developed cardiolipin studies which look in more detail at mitochondrial membrane structure and function.
Many of the above tests have been available in research laboratories, some John has developed through his own brilliance and initiative. What is so wonderful is how he has given these cutting edge research tests a clinical application.
This is extremely helpful for patients and clinicians because we can see exactly why mitochondria are ‘going slow’ and thereby correct deficiencies using both nutritional supplements, correct gut function, as well as being able to tailor detoxification regimes to individual patients.
This second paper also goes on to look at cell free DNA in ME/CFS patients.
Cell free DNA is a measure of DNA in the bloodstream that is not bound up within cell membranes. It can only, therefore, come from damaged cells and therefore is a measure of cell damage within the body.
What we found is a strong negative correlation with mitochondrial energy scores, ATP levels and the rate of oxidative phosphorylation. What this means is that those patients with mitochondria that perform extremely poorly have the highest level of cell damage and vice versa. This makes perfect biochemical sense – if mitochondria ‘go slow’ one can expect there to be the production of free radicals which have the potential to damage tissues.
Therefore addressing these issues of poor antioxidant status is an essential part of the package of treatment for ME/CFS patients.
These abnormal results clearly show that the effect on mitochondria is a systemic effect, not just confined to the neutrophils that are being tested. Very often we see levels of cell free DNA of a similar magnitude to those in patients who are experiencing a serious illness such as cancer, stroke, autoimmunity, or severe viral infection. Again this underpins the fact that ME/CFS is a physical condition with clear indications of marked cell damage.
This puts ME/CFS firmly in the realm of major organic pathology.
IMPLICATIONS FOR THE TREATMENT OF ME/CFS
These bio-medical tests have been extremely helpful in the diagnosis and management of ME/CFS patients. This is because they clearly identify the biochemical lesions that underpin the cause of this illness. Furthermore, identification of these lesions has clear implications for management using the standard methods of nutritional and environmental medicine.
We are currently preparing a third paper which looks at the efficacy of these interventions in patients by measuring mitochondrial function tests before and after such interventions and correlating these with the clinical picture.
For further information as to what these interventions are please see http://www.drmyhill.co.uk/wiki/CFS_-_CFS_Book_published_by_Dr_Sarah_Myhill, which is available on line without charge.
It bears repeating that this paper would not have been remotely possible without the brilliance of Dr. John McLaren Howard at Acumen Laboratory, who has developed these wonderful tests for looking at mitochondrial function, together with the analytical mind of Dr. Norman Booth, who has analyzed the data in detail to identify the biochemical metabolic pathways involved.
- July 4, 2012
Though ASD (Autism spectrum disorder) is mentioned a lot in this piece, the information it presents relates to all neuro-immune disorders, including ME/CFS.
From the Canadian ME/FM Action Network, here's a useful offering to assist teachers assist their students with ME/CFS by helping them understand the illness and the special needs that it entails.A SOURCEBOOK FOR TEACHERS OF YOUNG PEOPLE with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) and Fibromyalgia Syndrome (FMS) with Dr. David S. Bell world authority and researcher on ME/CFS and FMS in young people Dr. Bruce M. Carruthers lead author of the Canadian ME/CFS Consensus Document Co-Editor of the Canadian FMS Consensus Document and the TEACH-ME Task Force Second Edition.
104 pages, Available in English and French (click below):Teach-ME Sourcebook
A fantastic new FREE resource compiled in 2012 with input from Drs Bested, Bateman, Lapp and seven other ME/CFS specialists from Canada, the US and New Zealand. Forty Pages. Please print one off for your GP to further increase awareness and education. The Primer is found at: http://www.iacfsme.org/Portals/0/PDF/PrimerFinal3.pdf