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Allergies May All Be in the Gut, Study Finds Call 1-800-642-9670 |
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Allergies May All Be in the Gut, Study
Finds Wed
May 26, 2004 5:05 PM ET
And antibiotics could be to blame, the researchers told a
meeting of the American Society for Microbiology. The findings could help explain the puzzling rise in asthma
and allergies across the developed world in recent decades, the University
of Michigan researchers said. Antibiotics kill bacteria, but they can kill beneficial
bacteria living in the intestines and colon. Many doctors recommend that
patients taking antibiotics also eat "live" yogurt to replace
some of these helpful microbes. "We all have a unique microbial fingerprint-- a specific
mix of bacteria and fungi living in our stomach and intestines," said
Dr. Gary Huffnagle, an associate professor of internal medicine and of
microbiology and immunology at the University of Michigan. "Antibiotics knock out bacteria in the gut, allowing
fungi to take over temporarily until the bacteria grow back after the
antibiotics are stopped. Our research indicates that altering intestinal
microflora this way can lead to changes in the entire immune system, which
may produce symptoms elsewhere in the body." Experiments on mice suggest that altering the balance of
these so-called intestinal flora can affect the immune system. "After antibiotics changed the mix of microbes in the
gastrointestinal tract, the mice developed an allergic response in the
lungs when exposed to common mold spores," Huffnagle said in a
statement. "Mice that didn't receive the antibiotics were able to
fight off the mold spores." Huffnagle told the meeting that if the findings also hold
true in people, they could help explain why asthma and allergies are on
the rise. "Anything you inhale, you also swallow," Huffnagle
said in a statement. "So the immune cells in your GI (gastrointestinal) tract
are exposed directly to airborne allergens and particulates. This triggers
a response from immune cells in the GI tract to generate regulatory
T-cells, which then travel through the bloodstream searching the body for
these antigens." The immune system cells then block the development of
allergic responses. When antibiotics wipe out the bacterial population in the GI
tract, yeast and fungi move in and multiply. Fungi may secrete compounds called oxylipins, which can
control the type and intensity of immune responses, Huffnagle told the
meeting, being held in New Orleans. Having too many oxylipins may prevent the development of the
regulatory T-cells, in turn allowing for a hyperactive immune response
against allergens such as pollen, he proposed. |
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