I asked Bob Naviaux to respond to this. Here is his response. I hope it clears things up!
Hi Ron and Janet,
Janet told me about your keen commentary on our paper and told me about what people were calling a “disagreement” between us. I don’t see any disagreement. I’ve added the point to our Q&A. Please let me know if this “agreement” is too controversial for the CFS community at the present time.
Q7. How would you respond to Dr. Ronald Davis’s recent statement: “"What is important to note is that in the absence of evidence of an active infection, it is plausible that the long-term antimicrobial treatments often used for ME/CFS patients are doing more harm than good."
I am in complete agreement.Many antibiotics like tetracyclines, erythromycin, and the fluoroquinolones (eg, Cipro), and antivirals like acyclovir, fialuridine, AZT, and ddC also inhibit mitochondrial functions when used chronically (usually for more than about 3 weeks).Because mitochondria are descendants of free-living bacteria, their machinery for protein synthesis and DNA replication are susceptible to many antibiotics, and for reasons unique to mitochondrial DNA synthesis, they are also sensitive to antivirals.Chronic use of these drugs can do more harm than good if there is no longer good evidence for an active infection.When mitochondrial functions are critically impacted by long-term use of certain antibiotics, a ripple effect in metabolism and gene expression is produced that can further impair energy production by mitochondria, converting an active cell danger response that occurs during active infection to a hypometabolic survival response.
In the field of mitochondrial medicine we are particularly sensitive to these issues of iatrogenic toxicity because some of the drugs that inhibit mitochondrial functions are very commonly used in patients without mitochondrial disease.For example, statins, valproate, and metformin can each produce problems in patients with pre-existing mitochondrial dysfunction.
Bob
Robert K. Naviaux, MD, PhD
Professor of Genetics
Biochemical Genetics and Metabolism
Departments of Medicine, Pediatrics, and Pathology
Co-director, The Mitochondrial and Metabolic Disease Center (MMDC)
UCSD School of Medicine
Thanks Janet
@Rose49 for your efforts in this field. This new study is having a big resonance here in Italy. And many of us are interested in performing the metabolic profile. Is it possible to send blood samples from Italy?
As for the above comment by prof Naviaux about the use of antimicrobials in CFS, it still doesn't answer the question about the role of persistent intracellular infections in this disease. In his paper he states that "low sphingolipid profile in CFS ... may represent a fundamental response to oppose the spread of persistent viral and intracellular bacterial infections".
I am particoularly interested in this point as after more than a decade of CFS-like illness (I fulfill IOM criteria, with OI and PEM), I discovered an ongoing infection by
Borrelia burgdorferi (PCR+). Treatments for this condition led to the resolution of a form of hypoesthesia (with a pattern suggestive of
B. afzelii infection) and to improvements in some of my cognitive issues. Nevertheless, the core CFS symptoms remain, and I am still house-bound with poor cognitive function. I don't like the idea of long-term antibiotics, as I can't find reliable evidence for their efficacy in 'chronic Lyme'. But the concept that this spirochete may be still there is plausible at least in some cases, according to some studies on animal models of infection, which demonstate the survival of spirochetes after even aggressive treatments
(Embers, 2012), (Yrjänäinen, 2010).
I think that this study may be relevant in those cases of Lyme disease which fulfill CFS criteria. In fact, those patients who develop a CFS-like illness after the exposure to
B. burgdorferi will not manifest macroscopic damages from this infection (heart damages, permanent paralysis, brain lesions); and at the same time, those who are left with lesions to tissues, don't have CFS. I am not able to give a particular reference for this observation, but I have noted this pattern since I entered the Lyme comunity, two yeras ago. And I have always wondered the reason for this different response to the same infection. Now I belive that the answer is in the down regulation of sphingolipids in lipid rafts: those who eneter the hypometabolic state are less vulnerable to intracellular spreading by
B. burgdorferi and thus they will not develop permanet tissues damages. The price to pay for preserving their organs, is the sospension of their physical and intellectual life. On the other hand, those who don't use this defensive metabolic response, will not enter the CFS nightmare, but will lose some of their organ integrity, as a consequence of apoptosis.
As Naviaux himself has noted in his paper (
supporting information, page 3)
B. burgdorferi is one of those bacterial infections (along with
Coxiella burnetii) whose intarcellular spreading might be inibithed by the down regulation of sphingolipd-rich and cholesterol-rich lipid rafts. This support the above expressed hypothesis of two disitinc patterns in the immune response to
B. burgdorferi.