How probiotic Bifidobacteria could help celiac disease patients

Gluten is enemy No. 1 for those with celiac disease, and it’s hard to avoid. Episodes of this chronic autoimmune illness can be triggered by ingesting gluten, a key protein in wheat and some other grains. Researchers have been exploring how gut bacteria, especially

Bifidobacteria

, could be used as a treatment. Now, scientists publishing the results of laboratory experiments in ACS’

Journal of Agricultural and Food Chemistry

report how specific types of

Bifidobacteria

work.

Humans have many types of bacteria living in their digestive systems, but those with celiac disease have altered levels of “beneficial” and “harmful” gut bacteria. And even if they stick to a strict gluten-free diet, celiac disease patients typically cannot reestablish an ideal gut microbiome on their own. In particular, the levels of bacteria in the

Bifidobacteria

family are lower in those with the condition than in healthy individuals. These bacteria can chop up gluten proteins into smaller fragments that are not as triggering or damaging in patients, which has led researchers to try using the microbes as a probiotic to treat gastrointestinal diseases. So Edson Rodrigues-Filho, Natália E. C. de Almeida and colleagues set out to see exactly how various

Bifidobacteria

strains break down gluten peptides and what effect these smaller gluten-derived peptides would have on the immune response.

The researchers extracted gluten proteins from wheat flour and cultivated four strains of the

Bifidobacteria

family, both separately and in one large group. In an artificial intestinal environment,

B. longum

chopped up gluten proteins into the most fragments, compared to the other strains and the mixture of all four strains. From there, the team analyzed the cytotoxic and inflammatory responses to the various peptides, and found that those from the

B. longum

strain caused the least harm to intestinal cells in petri dishes. These results mark the first identification of specific gluten-derived peptides generated directly from intact gluten proteins by

Bifidobacteria

activity and the immunological responses to them by human cells, paving the way for new treatments and better patient outcomes, say the researchers.

###

The authors acknowledge funding from the

São Paulo Research Foundation

and the Brazilian National Council for Scientific and Technological Development.

The abstract that accompanies this paper can be viewed

here

.

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