zonulin
QUOTE
Researchers at the University of Maryland have finally found the cause of this curious reaction: a protein in the body called zonulin.
<a href="http://www.celiac.com/articles/64/1/Protei...ease/Page1.html" target="_blank">http://www.celiac.com/articles/64/1/Protei...ease/Page1.html</a>
Zonulin is a human protein that acts like a traffic conductor for the bodys tissues by opening spaces between cells, and allowing certain proteins to pass through, while keeping out toxins and bacteria. People with celiac disease have higher levels of zonulin, which apparently allows gluten to pass through the cells in their intestines, which triggers an autoimmune response in their bodies. Until now, researchers could never understand how a big protein like gluten could pass through the immune system. According to author Alessio Fasano, M.D., people with celiac have an increased level of zonulin, which opens the junctions between the cells. In essence, the gateways are stuck open, allowing gluten and other allergens to pass. Further: I believe that zonulin plays a critical role in the modulation of our immune system...(f)or some reason, the zonulin levels go out of whack, and that leads to autoimmune disease. Ultimately these finding may help doctors understand the causes of other, more severe autoimmune disor

ders.
<a href="http://www.sciencenews.org/articles/20000422/bob8.asp" target="_blank">http://www.sciencenews.org/articles/20000422/bob8.asp</a>
Tight junctions (light blue) normally seal the space between cells in the intestine (above). Then, nutrients or drugs (red and green) can only cross into the bloodstream when the cell takes them in, using proteins on the cell surface. Zonulin (blue) and the bacterial toxin Zot can trigger cells to open their tight junctions (below), permitting molecules to move into the bloodstream
QUOTE
Loosen Up
Bacterial toxin may lead to less painful treatments for diabetes and brain cancer
John Travis
<a href="http://www.sciencenews.org/articles/20000422/bob8.asp" target="_blank">http://www.sciencenews.org/articles/20000422/bob8.asp</a>
Take the nasty bacterium that causes cholera, delete the gene for its well-studied toxin, and you should end up with a harmless microbe that can immunize people against the real thing. It sounded like a good plan, recalls Alessio Fasano of the University of Maryland School of Medicine in Baltimore
The scheme failed, however. A decade ago, when Fasano and his colleagues used a genetically stripped Vibrio cholerae to vaccinate 10 people, half the volunteers developed mild diarrhea. The altered bacterium obviously had some bite left in it.
The effort to understand what went wrong in that vaccine experiment has shifted the interests of Fasano and his colleagues to topics far from cholera. In 1991, they identified a second V. cholerae toxin that contributes to the diarrhea of the disease. Since then, they've learned that this toxin mimics a protein that the body uses to regulate the permeability of the seams between cells within the intestine, brain, heart, and other tissues.
Fasano sees many uses for this human protein. By helping drugs slip out of the intestine and into the bloodstream, the protein may become a component of an insulin pill that replaces a diabetic person's periodic shots. A similar approach could enable scientists to sneak medications past the formidable blood-brain barrier.
Moreover, the discovery of the way the body normally controls tight junctions, the specialized seams between cells, may help investigators explain why the junctions sometimes aren't tight enough. Leaky junctions occur in disorders including diabetes, celiac disease, and even some brain illnesses.
"It's the typical example of scientific serendipity. We were looking for one thing and came up with something totally different," chuckles Fasano.
Bricks in a wall
If the cells that line the intestine represent bricks in a wall, tight junctions are the mortar that binds them together, or so scientists long thought. More recently, as they've identified some of the proteins that make up a tight junction, investigators have begun to realize that the bricks-and-mortar analogy is misleading. "Our molecular understanding of the junction complex is just exploding now," notes Mark Donowitz of the Johns Hopkins Medical Institutions in Baltimore.
Tight junctions have proven to be far more flexible and dynamic than mortar. Although the junctions in the intestine usually prevent proteins, water, and other molecules from passing between adjoining cells, they occasionally permit some molecules to slip through. In fact, cells can signal the tight junctions to alter their permeability, says Fasano.
The cholera toxin that his group discovered has now led the researchers to a regulator of the junction. The cholera toxin identified earlier directly increases secretions from the cells lining the intestine, resulting in diarrhea. Fasano's toxin instead opens tight junctions, enabling water and other molecules from blood to seep between the cells and into the intestine.
Drawing on the scientific name for tight junctions, the investigators dubbed the bacterial protein zonula occludens toxin, or Zot. They also identified the protein on intestinal cells to which Zot binds, triggering the loosening of the tight junctions.
Fasano and his colleagues immediately wondered if there was a human protein resembling the bacterial toxin. After all, because of their intimate and long-term association with the organisms they infect, bacteria are among the best cell biologists around. The microbes frequently make proteins that mimic some of the host's molecules.
Sure enough, the investigators found a Zotlike human protein, which they named zonulin. Zonulin, too, makes the intestine "leakier," says Fasano. To confirm that the human intestine produces this protein, the scientists obtained various tissues from a cadaver and screened them for zonulin by using antibodies that latch onto Zot. As expected, intestinal tissue contained the protein, but so did heart, brain, and a few other tissues.
Sooo!!!???????
Does that mean that when they do add this protein... Zonulin to vaccinations.. so that the medication can break thru to where they want it to go... what happens afterwards??? does the body get rid of the extra Zonulin??? Excrete it???
or does it stay on... and play with the rest of the organs in the body... causing leaky gut.. celiac...and a host or other auto-immune diseases????
QUOTE
Fasano calls zonulin a key that opens a gate between cells. He notes that the human body actually has several similar keys. Zonulin made in the intestine differs by a few amino acids from the ones produced in the brain or in other tissues. The subtle alterations seem to prevent zonulin meant for one tissue from altering the tight junctions of another.
"It makes sense," says Fasano. "[The body] may have a need to make the intestine leakier but leave the blood-brain barrier unaffected, or vice-versa."
QUOTE
Pardridge expresses skepticism about this approach, however. "If you're going to deliver drugs by disrupting the blood-brain barrier, you're going to let in everything else in the bloodstream," he warns, pointing out that other compounds that disrupt the barrier have induced seizures in animals.
Fasano counters that those compounds irreversibly destroy the barrier, whereas Zot or zonulin would open tight junctions of the blood-brain barrier just long enough to allow transport of a drug across it. Preliminary tests with rodents support this belief, he says.
"If well used, zonulin should not cause any side effects, since the process is quick and reversible within a few minutes," asserts Fasano.

Are they sure????
It may work on rats... but are they sure for humans?????
Note with celiacs... they have an excess of Zonulin..
Must compare notes with vaccinations that break the blood brain barrier eg
Meningococcal vaccine
http://www.caringforkids.cps.ca/immunizati...ningococcal.htmand an increase of auto immune diseases....
http://www.usatoday.com/news/health/2007-0...-advances_N.htmQUOTE
Disorders of the immune system can be debilitating and expensive, and are likely to be much more common than previously realized.
But just how many people have them is not known, because such diseases are not tracked. The National Institutes of Health estimated in a 2005 report that 5% to 8% of Americans, up to 23.5 million, have one or more autoimmune diseases, which occur when the immune system launches an attack on healthy cells within its own body.
Does an increase in zonulin (from ingesting gluten) cause autoimmune diseases or do autoimmune diseases cause an increase in zonulin?
http://brain.hastypastry.net/forums/showthread.php?t=22330