Wednesday, 24 February 2010


Before I was diagnosed with Lyme Disease I had been diagnosed with Fiobromyalgia and then ME/CFS and then Arthritis and muscle weakness leading to a Poly Myalgia Rheumatica diagnosis, so I watch with interest how things are developing with new retrovirus XMRV. Like many I was disappointed to hear of the two UK studies finding no XMRV but remained sceptical about the method of those studies, below is an insight into those methodologies.

Dr. Mikovits - Dr. Cheney on XMRV and CFS Transcript (2/20/10)
I’d like to start with Judy and ask her a couple of questions having to do with how hormones might interact with XMRV, specifically androgens &/or estrogens, or even any other hormones. Judy, can you answer that?Judy – We know from work in the laboratories of Bob Silverman and Steven Goff from Columbia University that the retrovirus XMRV has what’s known as the cis-acting element, literally the on/off switch of the virus, two androgen and hormone responsive elements. And that means that when that virus, when the on/off switch sees certain hormones, it can turn it on &/or off, so what you would want to do is have a balance of hormones and not spikes. And we really don’t know a lot of how exactly they control the expression of the virus or the reservoirs that might be involved given the hormone sensitivities or switch of the virus, but there is a hormone responsive element to the virus that we think will be critical in understanding how it might cause disease. Cheney – I see. We’ve been looking at hormones here for several years now using the Echo Terrain Map technology which allows us to look at redox shifts, very sensitively in CFS patients. And we see, in cases of hormone testing, both on the scan or under the tongue, a rather transient and immediate responses from a redox perspective, both positive and negative. And my concern about that is that it may not necessarily reflect what happens downstream in case of a virus, but certainly redox shifts, positive or negative, might influence the virus. In that regard, my sense, over time, has been that, perhaps, a balancing act of hormones may be the best way to go and not to rely on one particular hormone to suppress it or worry about another particular hormone activating it. But it’s more about balance than any specific hormone.

Cheney – Okay. Why do you think peptide-T would actually inhibit XMRV? Is there a scientific basis for that? Or is just hoped that it will?Judy – Actually, no. On that note, Candice Pert who actually developed, discovered it and runs the company that has run clinical trials with peptide-T in HIV disease had actually, more than a decade ago, run a clinical trial in men with CFS and they saw improvement. And when our paper came out, she said – and I understand why now – she contacted me immediately and said, “We have an opportunity, we have some drug that is ready and certified by the FDA, so it’s a limited amount now, but we could run some small studies and actually follow XMRV. Peptide-T is known to interact with the monocyte, which is a cell type in your innateimmune response, that’s known to be infected in, and actually play a role in retroviral diseases. And as we mentioned, that was my PhD thesis. So, we actually had some sound scientific rationale to actually use peptide-T in this cohort with XMRV.Cheney – I’d like to explore another sort of generic issue and that has to do with testing. And beyond that, the recent reports out of the United Kingdom of negative results for the testing by PCR of blood in CFS patients. And beyond that, the fact that some patients who have been tested at VIPdx Laboratories in Reno using the WPI, Whittemore Peterson validated testing procedures are also negative. And so, I’d like you to comment a little bit about the reasons why you can get negative results and importance of methodologies.
Judy – The methodologies are really critical in studying XMRV because there’s as much that we don’t know about it as we do know about it. It is apparent from the UK studies as well as the German study in prostate cancer who looked at more than 500 samples and didn’t find XMRV either by PCR and some other techniques, it is clear that what we don’t know about the virus with regard to is – it’s reservoirs – what cells it’s living in, where it is in the body. As much as we do know about the virus, so unless you use all four techniques in the Science paper for isolating it and determining the presence of the virus - in that case, failure to detect it by PCR does not mean it’s not there. And even by the culture method that is used by VIPdx right now, we are working very hard to get the serology, which means that the patient would have had an immune response to the virus and we can detect that serologically in our paper, but we don’t have that test online yet as a diagnostic or a clear certified test yet, but we hope to have that test within the next month or so, as I’ve said, maybe within weeks, to be validated for clinical use. If you went just by the virus – that is, I can’t isolate it or VIP can’t isolate it by the techniques in our paper, and you have the antibody, it is evidence that you’re infected and since the retrovirus is a lifelong infection, we simply then just don’t know the reservoir where this virus is. So this is a very low copy number, meaning it is very low level in peripheral blood. And really, unless you use all four techniques that are described in our Science paper, and go to the WPI website where we have detailed the differences in the methodologies in the different studies to give you an idea of the complexity of the issues, but also what’s necessary to detect the virus. So, we will, very shortly, have all of the testing available.

1 comment:

  1. XMRV was found to be a lab contaminant read Hilary Joghnson's article