Link between gut flora and multiple sclerosis discovered

Inflammatory cascade

In the journal Science Translational Medicine, the scientists report that T cells -- i.e. the immune cells responsible for pathological processes -- react to a protein called GDP-L-fucose synthase. This enzyme is formed in human cells as well as in bacteria frequently found in the gastrointestinal flora of patients suffering from multiple sclerosis. "We believe that the immune cells are activated in the intestine and then migrate to the brain, where they cause an inflammatory cascade when they come across the human variant of their target antigen," says Mireia Sospedra.

For the genetically defined subgroup of MS patients examined by the researchers, results show that gut microbiota could play a far greater role in the pathogenesis of the disease than previously assumed. Mireia Sospedra hopes that these findings can soon also be translated into therapy; she plans to test the immunoactive components of GDP-L-fucose synthase using an approach that the researchers have been pursuing for several years already.

Re-educating the immune system

"Our clinical approach specifically targets the pathological autoreactive immune cells," says Sospedra. This approach therefore differs radically from other treatments that are currently available, which throttle the whole immune system. While these treatments often succeed in stopping the progression of the disease, they also weaken the immune system -- and can thus cause severe side effects.

The clinical approach of the research group involves drawing blood from MS patients in a clinical trial and then attaching the immunoactive protein fragments onto the surface of red blood cells in a laboratory. When the blood is reintroduced into the bloodstream of patients, the fragments help to "re-educate" their immune system and make it "tolerate" its own brain tissue. This therapeutic approach aims for effective targeted treatment without severe side effects.