A pathway in the immune system activated in Crohn's disease and which holds promise for investigating new treatments has been discovered by scientists.
CD is a form of inflammatory bowel disease (IBD) in which the body's own immune system attacks the gastrointestinal tract, and treatment is focused on controlling the symptoms of the disease in its acute phase and managing it in remission. But recently, researchers at Case Western Reserve University School of Medicine identified a pathway in the immune system activated in CD and which holds promise for investigating new treatments.
Fabio Cominelli, MD, professor of medicine at the School of Medicine and chief of gastroenterology at University Hospitals Cleveland Medical Center, led a three-year study, published recently in Cellular and Molecular Gastroenterology and Hepatology, focusing on the chronic inflammation that occurs in genetically susceptible individuals with CD.
"During early inflammation, TWEAK/Fn14 activates to heal tissue damage," said Cominelli. "However, during later, chronic inflammation, increased and persistent levels of Fn14 may lead to pathologic inflammation and fibrosis."
Today's CD treatments, such as steroids and monoclonal antibodies, may work for a while, but often cease to be effective. They also may cause hypertension, infection and the risk of birth defects in pregnant women being treated for IBD. As CD patients endure a roller-coaster ride of flare-ups, repeated hospital stays, surgeries and treatments relieved by intervals of remission, the disease becomes dramatically life-changing and emotionally stressful.
To better understand the link between TWEAK/Fn14 and chronic inflammation, the team of researchers used mice bred to develop CD-like disease, and then genetically deleted the cell-surface receptor Fn14. The mice with genetically deleted Fn14 had less severe inflammation. Those with the Fn14 receptor had chronic intestinal inflammation and scarring.
To test whether their findings in mice could be meaningful to CD in humans, the research team then used molecular diagnostics to analyze resected intestinal tissues from patients with and without IBD. The results showed significant TWEAK/Fn14 overexpression in tissue from patients with CD. Cominelli believes that blocking Fn14 pharmacologically using novel drugs and antibodies may ameliorate the inflammation and fibrosis in CD.
The study has implications for cancer treatment as well. According to Cominelli, since chronic inflammation can lead to the initiation and growth of tumors in patients with IBD, those patients are exposed to a risk of developing colorectal cancer that is directly proportional to the extent and duration of their disease.
"This research establishes the rationale for investigating innovative therapies that can improve and save lives," Cominelli said.