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Multiple sclerosis<\/a> is characterized by an immune system gone haywire. A patient\u2019s immune system starts treating the protective coating of the nerves \u2013 called myelin<\/a> \u2013 as dangerous. The subsequent nerve damage can cause a variety of symptoms, including muscle weakness, pain and vision loss. MS currently has no cure, and doctors still don\u2019t completely understand what causes it.<\/p>\n While there is a genetic component to MS, environmental factors<\/a> also play a big role in determining whether someone will develop the disease. Recent evidence<\/a> suggests that what\u2019s in your digestive tract may also be a meaningful contributor to disease risk.<\/p>\n My colleagues and I<\/a> at the University of Virginia are working to understand the two-way communication between the human body and the bacteria that live in its digestive system. In our recently published research<\/a>, we found that bile acid in the intestines could be harnessed to protect people at high risk of MS from developing the disease, offering a new avenue for drug development.<\/p>\n <\/a><\/a> Trillions of bacteria<\/a> live in the human gut. They help the body with everything from digesting food to preventing the overgrowth of infectious and dangerous bacteria. They also \u201ceducate\u201d the immune system<\/a> to recognize what is dangerous and what is not. If this process is disturbed, the immune system may become overactive and start to treat natural parts of the body as dangerous. This is called autoimmunity.<\/p>\n Scientists believe that one way bacteria and the immune system communicate with each other is through the aryl hydrocarbon receptor, or AHR<\/a>, which resides in most cells of the body. This protein acts like an emergency call center \u2013 when it encounters certain chemicals, it will identify the appropriate response and send a signal to the cell recommending what it should do.<\/p>\n While researchers have shown that signals from AHR<\/a> influence multiple sclerosis development, how it does so is unclear. To better understand what AHR is doing specifically in the guts of patients with MS, we genetically engineered mice that are missing AHR in some of their immune cells. By silencing AHR\u2019s activity, we could understand what role it may be playing in autoimmunity.<\/p>\n We expected to learn more from this experiment about the molecular communication of immune cells. Instead we found something surprising: The gut environment in these mice had changed<\/a>. Specifically, the chemical composition of their guts had been altered, indicating that the metabolism of gut bacteria had shifted. This meant that AHR is not only sensing what\u2019s going on in the gut, but the receptor is also actively shaping its environment.<\/p>\n
\nttsz\/iStock via Getty Images Plus<\/a><\/span>
\n<\/figcaption><\/figure>\nThe gut microbiome and autoimmunity<\/h2>\n
![<\/p>\n<\/div>\n<\/a><\/a>\n Multiple sclerosis results when the immune system attacks the protective myelin sheath of neurons.<\/span>\nttsz\/iStock via Getty Images Plus<\/a><\/span>\n<\/figcaption><\/figure>\nThe gut microbiome and autoimmunity<\/h2>\nTrillions of bacteria<\/a> live in the human gut. They help the body with everything from digesting food to preventing the overgrowth of infectious and dangerous bacteria. They also \u201ceducate\u201d the immune system<\/a> to recognize what is dangerous and what is not. If this process is disturbed, the immune system may become overactive and start to treat natural parts of the body as dangerous. This is called autoimmunity.<\/p>\nScientists believe that one way bacteria and the immune system communicate with each other is through the aryl hydrocarbon receptor, or AHR<\/a>, which resides in most cells of the body. This protein acts like an emergency call center \u2013 when it encounters certain chemicals, it will identify the appropriate response and send a signal to the cell recommending what it should do.<\/p>\nWhile researchers have shown that signals from AHR<\/a> influence multiple sclerosis development, how it does so is unclear. To better understand what AHR is doing specifically in the guts of patients with MS, we genetically engineered mice that are missing AHR in some of their immune cells. By silencing AHR\u2019s activity, we could understand what role it may be playing in autoimmunity.<\/p>\nWe expected to learn more from this experiment about the molecular communication of immune cells. Instead we found something surprising: The gut environment in these mice had changed<\/a>. Specifically, the chemical composition of their guts had been altered, indicating that the metabolism of gut bacteria had shifted. This meant that AHR is not only sensing what\u2019s going on in the gut, but the receptor is also actively shaping its environment.<\/p>\n](\"https:\/\/images.theconversation.com\/files\/512502\/original\/file-20230227-155-mhfk7f.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1000&fit=clip\"){kind=link}