Genetic Susceptibility
• Different genetic abnormalities can lead to similar disease phenotypes. • Genes associated with Crohn's disease are not implicated in Ulcerative Colitis • There is similar chromosomal susceptibility in CD and UC.
Crohn’s disease Ulcerative Colitis
Mutant CARD15 causes; Decreased antimicrobial peptide secretions from Paneth cells of the small intestine Defective down-regulation of innate immune response to bacterial adjuvants Ineffective clearance of intra- cellular bacteria infections Proliferation of luminal and mucosally adherent commensal bacteria …show more content…
o Adjuvants activate innate immune responses, including dendritic cells and other APCs o Antigens stimulate the clonal expansion of T cells that selectively recognize the antigen through their T-cell receptor leading to aggravated T-cell response • There is both bacterial and host specificity to each disease
Crohn’s disease Ulcerative Colitis
Luminal Microbial Antigens and Adjuvants
• Infection and NSAIDS -Initiate non-specific inflammation and break mucosal barrier • Diet - Implicated by patients but mechanisms poorly understood • Aluminium and Iron may have adjuvant activity and