'Worm Therapy' Stimulates Gut MucusStephanie Pappas
Date: 01 December 2010 .
..Ulcerative colitis, a type of inflammatory bowel disease, is marked by constant abdominal pain and frequent bloody diarrhea.
The disease, which leaves the intestinal lining inflamed and ulcerated, isn't well understood.
Some patients improve with immune-suppressing drugs, but these treatments can have major side effects.
When all else fails, patients require surgery to remove part, or all, of the colon.
Frustrated by these options, some patients have turned to a treatment not for the squeamish-at-heart: Swallowing the eggs of parasitic worms.
These worms, or helminthes, are able to modulate their host's immune system to stay alive.
Several studies (along with anecdotal reports) have shown that as a side effect, inflammatory bowel symptoms decrease.
In the new study, published today (Dec. 1) in the journal Science Translational Medicine, researchers followed a man who deliberately infected himself with Trichuris trichiura, the human whipworm. It's an approach not recommended by doctors:
The only worm that's been approved for clinical testing in the United States is Trichuris suis, a pig whipworm that survives in humans only temporarily. For this patient, however, the worms seemed to ease the ulcerative colitis symptoms, perhaps by stimulating immune cells to produce proteins that promote healing instead of inflammation. ...
...Whipworm treatment
The patient, a 35-year-old man, was diagnosed with ulcerative colitis in 2003. In 2004, rather than take immune-suppressing steroids, the patient swallowed 500 whipworm eggs he had obtained from Thailand. Three months later, he downed an additional 1,000 eggs.
After taking the eggs and seeing his symptoms improve to the point that he didn't need treatment ⎯ the man contacted P'ng Loke, now a professor of medical parasitology at New York University's Langone Medical Center.
Then a researcher at the University of California, San Francisco, Loke agreed to track the patient's progress and analyze just what was going on in the man's gut.
"When he had colonoscopies for different reasons, we basically tried to characterize biopsies that were taken from his gut," Loke told LiveScience. "We tried to look at these biopsies and see what kinds of immune cells were activated… what kind of genes were activated. We were trying to put together a picture of what was going on in the gut at different times."
In 2005, Loke and his colleagues observed a symptom-free patient with a large intestine full of worms.
In worm-infested areas, the intestinal lining looked healthy and mucus-rich.
In 2008, the man's ulcerative colitis symptoms returned. The flare-up coincided with a drop in the number of worm eggs in the man's stool, from 15,000 eggs per gram to less than 7,000, the researchers observed.
The patient dosed himself with another 2,000 whipworm eggs. His symptoms retreated....
www.livescience.com/9036-worm-therapy-stimulates-gut-mucus.html