Hip
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Hip, I am pretty sure that you have either not read, or not understood, my explanation of how ROS is involved these illnesses in the opening post of this thread, according to my hypothesis. It doesn't matter if your SOD works perfectly if you don't have enough NADPH to support glutathione reductase, because SOD makes H2O2 and without enough NADPH you won't have enough reduced glutathione, (and thioredoxin), in your mitochondria to get the H2O2 down to normal, and H2O2 damages iron-sulfur clusters. This is the heart of the vicious cycle causing these illnesses, according to my hypothesis.
OK, I have read this thread again, and I now follow your line of thinking better.
The hypothesis you are presenting appears to be the following (please correct if wrong):
You are pointing out that the energy produced in mitochondria can either be used to make ATP, the universal energy molecule, or to make the pro-antioxidant NADPH. NADPH is important to make because it protects certain delicate mitochondrial machinery (the iron-sulfur proteins) from being damaged by hydrogen peroxide.
Hydrogen peroxide is always being produced as a by-product of mitochondrial function: operating mitochondria generate the potent ROS superoxide, and this superoxide is then converted into the less potent ROS hydrogen peroxide by the enzyme SOD2 within the mitochondria. But if this hydrogen peroxide is not itself neutralized, it will cause damage.
NADPH facilitates the neutralization of hydrogen peroxide by ensuring that there is plenty of glutathione available in the mitochondria; it is glutathione which actually performs the job of neutralizing hydrogen peroxide. NADPH ensures glutathione is available by constantly regenerating the "spent" glutathione back into "fresh" glutathione again, ready to neutralize more hydrogen peroxide. Glutathione gets "spent" when it neutralizes hydrogen peroxide, being converted into glutathione persulfide (GSSH) during this neutralization process; but NADPH converts this "spent" glutathione, ie the GSSH, back into "fresh" glutathione.
You are hypothesizing that when ME/CFS patients engage in too much activity, most of the energy produced in the mitochondria is directed towards making ATP, in order to provide the energy needs of the body and brain; but this manufacture of ATP is done at the expense of NADPH manufacturing, which means that there will not be enough NADPH around to protect against the damage that hydrogen peroxide can inflict on the delicate iron-sulfur proteins found in the electron transport chain of the mitochondria.
This lack of NADPH then leads to further damage of the mitochondrial iron-sulfur proteins, resulting in even lower mitochondrial energy output, resulting in even less energy being spare to make the protective NADPH, and this is the basis of your proposed vicious circle of mitochondrial damage.
You are suggesting that if the ME/CFS patient only engages in short periods of energy expenditure, punctuated by periods of rest, then this will ensure that the levels of hydrogen peroxide will not rise too high, and will also allow breathing space for the mitochondria to direct their energy output to make the all-important protective NADPH.
I have to admit that on re-reading this thread, this hypothesis is intriguing. I guess a lot hinges on whether the damage inflicted by hydrogen peroxide on the iron-sulfur proteins in the mitochondria does actually lead to reduced mitochondrial energy output, as this is the basis of the vicious circle. And as with any mitochondrial theory of ME/CFS, it depends on whether reduced mitochondrial output and increased ROS can be shown to give rise to the symptoms observed in ME/CFS.
Incidentally, there is a theory by Dave Whitlock not dissimilar to yours, which hypothesizes ME/CFS is caused by low numbers of mitochondria. The average mitochondrion has a lifespan of around 1 month, after which it must be replaced. Whitlock thinks that in ME/CFS not enough new mitochondria are being made to replace the old ones. So ME/CFS patients are running on old, worn out mitochondria, which become leaky, thereby producing more reactive oxygen species and less energy output. More info here.
I have not been able to find antioxidants which deal with H2O2, and are not ultimately dependent on NADPH, and that can be taken in large enough amounts to deal with the ROS. As you can see in this diagram glutathione, vitamin C and vitamin E all depend on NADPH availability.
This study found that the nootropic supplement piracetam improves mitochondrial dysfunction following oxidative stress. I am not sure if this is useful for you. By my calculations, for a normal weight person, the piracetam concentrations of 100 microM and 1000 microM used in the study would work out to an oral dose of 570 mg and 5700 mg of piracetam respectively.
This catalase supplement by Invite Health may also be of interest. Coincidentally, in this thread @Mya Symons found that taking a catalase supplement improved his PEM, and he speculates that the mechanism is catalase's hydrogen peroxide scavenging ability.
There are some other drugs and supplements that support or stimulate the various mitochondrial complexes listed in the first post of this thread. I am not sure if these will be of any use from the perspective of your theory.
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