Non-apoptotic role of BID in inflammation and innate immunity
Autor: | Christopher P. Dillon, Karine Doiron, Maya Saleh, John C. Reed, Patrick Fitzgerald, Douglas R. Green, Garabet Yeretssian, Ricardo G. Correa |
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Rok vydání: | 2011 |
Předmět: |
Nod2 Signaling Adaptor Protein
Apoptosis Inflammation IκB kinase Nod Biology Mice Immunity Nod1 Signaling Adaptor Protein NOD2 NOD1 medicine Animals Humans Intestinal Mucosa Multidisciplinary Innate immune system Pattern recognition receptor Epithelial Cells Colitis Immunity Innate I-kappa B Kinase Mice Inbred C57BL HEK293 Cells Immunology RNA Interference medicine.symptom HT29 Cells BH3 Interacting Domain Death Agonist Protein Signal Transduction |
Zdroj: | Nature. 474:96-99 |
ISSN: | 1476-4687 0028-0836 |
Popis: | Innate immunity is a fundamental defence response that depends on evolutionarily conserved pattern recognition receptors for sensing infections or danger signals. Nucleotide-binding and oligomerization domain (NOD) proteins are cytosolic pattern-recognition receptors of paramount importance in the intestine, and their dysregulation is associated with inflammatory bowel disease. They sense peptidoglycans from commensal microorganisms and pathogens and coordinate signalling events that culminate in the induction of inflammation and anti-microbial responses. However, the signalling mechanisms involved in this process are not fully understood. Here, using genome-wide RNA interference, we identify candidate genes that modulate the NOD1 inflammatory response in intestinal epithelial cells. Our results reveal a significant crosstalk between innate immunity and apoptosis and identify BID, a BCL2 family protein, as a critical component of the inflammatory response. Colonocytes depleted of BID or macrophages from Bid(-/-) mice are markedly defective in cytokine production in response to NOD activation. Furthermore, Bid(-/-) mice are unresponsive to local or systemic exposure to NOD agonists or their protective effect in experimental colitis. Mechanistically, BID interacts with NOD1, NOD2 and the IκB kinase (IKK) complex, impacting NF-κB and extracellular signal-regulated kinase (ERK) signalling. Our results define a novel role of BID in inflammation and immunity independent of its apoptotic function, furthering the mounting evidence of evolutionary conservation between the mechanisms of apoptosis and immunity. |
Databáze: | OpenAIRE |
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