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These are promising findings, but they are in the very early stages. Only mice have so far been studied, with a specific focus on peanut allergy and Clostridia bacteria. Further study developments from this animal research are awaited.
An extension of this theory is that environmental factors including sanitation, but also increased use of antibiotics and vaccination have altered the composition of natural gut bacteria, which play a role in regulating our sensitivity to allergens. It has been suggested that infants who have altered natural gut bacteria could be more sensitive to allergens.
This suggests that Clostridia plays a role in protecting against sensitisation to food allergens.
The findings inform the theory that our increasingly sterile environments and increased use of antibiotics could lead to a reduction in our normal gut bacteria, which could possibly lead to people developing a sensitivity to allergens.
But these findings are in the very early stages. So far, only mice have been studied, and only their reactions to peanuts. We don't know whether similar results would be seen with other tree nuts or other foods that can cause an allergic response.
The researchers then carried out further laboratory experiments looking at the process by which Clostridia could be offering protection. They found the bacteria increases the immune defenses of the cells lining the gut.
These groups of mice were then given purified extracts of roasted unsalted peanuts to assess their allergic response.
The study in question showed that mice lacking normal gut bacteria showed increased allergic responses when they were given peanut extracts.
After looking at the allergic reactions in the germ free and antibiotic treated mice, specific groups of bacteria were reintroduced into their gut to see what, if any, effect it had on their allergic response.
The researchers hope the findings could one day support the development of new approaches to prevent or treat food allergies using probiotic treatments.
Common bacteria could help prevent food allergies
the gut lining and preventing some of the food allergen entering the bloodstream.
This mouse study aimed to examine the role of gut bacteria in sensitivity to food allergens, with a focus on peanut allergy.
When the germ free mice were exposed to peanut allergens, they demonstrated a greater immune response than normal mice and also demonstrated features of an anaphylactic reaction.
"Bacteria which naturally live inside our digestive system can help prevent allergies and may become a source of treatment," BBC News reports after new research found evidence that Clostridia bacteria helps prevent peanut allergies in mice.
the US, and the University of Bern in Switzerland.
One specific effect seen was how Clostridia increased the activity of a particular antibody, which reduced the amount of peanut allergen entering the bloodstream by making the gut lining less permeable (so substances are less likely to pass through it).
is the theory that reducing our exposure to infectious microbes during our early years through overzealous sanitisation, for example deprives people's immune systems of the "stimulation" of exposure, which could then lead to allergic disease.
The researchers found that adding Bacteroides to the gut of the germ free mice had no effect on the allergic reaction. However, adding Clostridia bacteria reduced sensitivity to the peanut allergen, making their allergic response similar to normal mice.
This has caused speculation about whether alterations in our environment could be driving allergic sensitivity to foods. One such theory is the "hygiene hypothesis" (discussed above).
The researchers then tested the effects of recolonising the mice's guts with specific groups of bacteria. They found that giving Clostridia bacteria (a group of bacteria that includes the "superbug" Clostridium difficile) reduced the allergic response.
This was further confirmed when Clostridia was used to recolonise the guts of the antibiotics mice and was found to reduce their allergic response.
The researchers focused on reintroducing Bacteroides and Clostridia groups of bacteria, which are normally present in mice in the wild.
As the researchers say, life threatening anaphylactic reactions to food allergens (any substance that generates an allergic response) are an important concern, and the prevalence of food allergies appears to have been rising over a short space of time.
Faecal samples taken from the antibiotic mice were found to have a significantly reduced number and variety of gut bacteria. These mice also had increased sensitivity to peanut allergens, demonstrating an increased immune system response that produced antibodies specific to these allergens, as well as showing symptoms of allergy.
This research examined how normal populations of gut bacteria influence mouse susceptibility to peanut allergens. The findings suggest the Clostridia group of bacteria may have a particular role in altering the immune defenses of Omega Speedmaster Racing Chronograph
This study was conducted by researchers from the University of Chicago, Northwestern University, the California Institute of Technology and Argonne National Laboratory in Omega Seamaster Cosmic 2000
Another group of mice were treated with a mixture of strong antibiotics from two weeks of age to severely reduce Omega Speedmaster Racing Review the variety and number of bacteria in their gut.
BBC News gave a balanced account of this research.
Funding was provided by Food Allergy Research and Education (FARE), US National Institutes of Health Grants, the University of Chicago Digestive Diseases Research Core Center, and a donation from the Bunning family.
It was published in the peer reviewed journal PNAS.
The researchers investigated the role gut bacteria plays in sensitivity to food allergens in different groups of mice. The research team studied mice born and raised in a completely sterile, bacteria free environment so they were germ free.
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