Evaluation of the Expression of Natural Killer T Cells (NKT) Marker in the Gut of Patients With Primary Sclerosing Cholangitis (PSC) Complicated by an Inflammatory Bowel Disease (IBD)

Inflammatory bowel diseases (IBD) include Crohn's disease (CD) and ulcerative colitis (UC). These diseases are a public health problem because they concern many patients (1 case in 1000). IBDs are characterized by dysregulated immune response against luminal antigens causing chronic inflammation of the gut in genetically predisposed individuals. Their exact cause is unknown and there is currently no cure. The primary sclerosing cholangitis (PSC) is a liver inflammatory disease of unknown origin that is known to be strongly associated with IBD. An important clinical observation highlights the mild symptoms of IBD when associated to the PSC. Conversely, treating PSC by liver transplant or immunosuppressive drugs is associated with a progression of intestinal inflammation.

Based, on these clinical findings that suggest a protective effect regulator of liver inflammation on intestinal inflammation, and on the results obtained by our group in mouse models that identified the natural killer T cell (NKT) as essential in control of experimental colitis, the project aims to determine, using PCR, if the expression of NKT cell markers are increased in the colon of patients with PSC+IBD compared to patients with IBD alone or PSC alone.