Quote:
heme is not my bag
...but wow what a great paper I am so glad you picked up on it Sharon!
when you see the word heme it has to do with iron. Hemeglobin is the oxygen carrying part of the red blood cells that leaks into the tissue and is the source of the iron in the tissue when there is venous insufficiency.
What this paper is saying is that when the vitamin d hormone is present, oxidative injury secondary to the presence of iron is reduced.
More work will be done on this aspect of research as time goes on starting from the idea of CCSVI and working backwords from there as to why vitamin d plays a role, of course any person with a brain and MS is aware of the fact that vitamin d is important in MS.
This paper may explain why people geographically in places where the vitamin D is low have more MS. They simply get more aggressive oxidative damage secondary to the leaking endothelium.
OK so in plain english:
CCSVI results in a pinched area of the blood vessels in the neck so....
the blood can't get out of the brain easily and there is mildly increased pressure in those specific veins as well as reflux, so....
reflux and increased pressure causes reduced shear stress and the endothelium (skin of the blood vessel) becomes leaky so....
blood cells and things in the circulation can leak into the tissue, this includes hemeglobin and therefore iron, so....
the body reacts vigorously to iron in the tissue launching an aggressive response that actually damages the tissue in the effort to clean up this iron. The iron is "eaten" by immune cells and this breaks it down to hemosiderin. In both MS relapse and venous insufficiency with stasis ulcer(leg ulcers known to be cause by venous stenosis in the legs) people spill hemosiderin the the urine. so...
if vitamin d reduces this aggressive response specifically to heme then this may explain why people in low vitamin d areas show up with MS.
And I wonder if the often mentioned (anyone have a reference?) fact that they very often discover MS type lesions on autopsy in people who never had that diagnosis in life means that such persons had enough vitamin D to recover from their relapses?....or maybe to never accumulate enough damage to make it visible?? or possibly the endothelium never leaks if enough vitamin d is there (I bet you they knew something was wrong with them, even if it never got "bad enough" to show noticeable MS symptoms)
I'll be back in a bit with mroe papers on this vit d and heme angle if I can find some...