So, zonulin may contribute by weakening tight junctures...and it's probably a great idea to cut back on gluten (for many reasons)
but I still believe the real culprit is endothelial dysfunction due to altered cerebral hemodynamics. The better the blood flow, the better the tight junctions...hypoperfusion and venous reflux may could be responsible for the breakdown of the BBB.
Dr. Simka wrote up a great paper on this thesis of loss of shear stress, and how this changes the BBB.
Quote:
Yet, it was recently demonstrated that the blood-flow- associated forces, predominantly the level of shear stress, can profoundly affect the expression of tight junction proteins, thus regulating the strength of the endothelial barrier. It has been shown that increased shear stress, especially with pulsatile flow characteristics, upregulated pivotal tight junction proteins, such as occludin and ZO-1 in the cerebrovascular endothelium. Consequently, increased expression of these proteins was associated with reduced transendothelial permeability (Colgan et al., 2007). In parallel, loss of shear stress after flow cessation enhanced the blood-brain barrier permeability. (Krizanac-Bengez et al., 2006a; Krizanac-Bengez et al., 2006b)
Therefore, a reduced shear, for example due to the refluxing venous blood flow, could potentially result in the weakening of the blood-brain barrier. In addition, it has been found that steady shear stress upregulated the activity of the Na-K-Cl cotransporter in cerebral microvascular endothelium. Although it remains unclear whether this protein could control the integrity of the blood-brain barrier, it is suspected that it plays a role in the regulation of endothelial cell volume (Chang et al., 2008; Suvatne et al., 2001).
check out the full paper here:
http://www.ccsvi.co.uk/resources/Simka% ... S%2009.pdf
cheer
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Husband dx RRMS 3/07
dx dual jugular vein stenosis (CCSVI) 4/09
dual stents placed 5/09
CCSVI in MS