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Inflammation
Nature 454 (7203), 427 (24 Jul 2008)
Inflammation is the body's immediate response to damage to its tissues and cells by pathogens, noxious stimuli such as chemicals, or physical injury. Acute inflammation is a short-term response that usually results in healing: leukocytes infiltrate the damaged region, removing the stimulus and repairing the tissue. Chronic inflammation, by contrast, is a prolonged, dysregulated and maladaptive response that involves active inflammation, tissue destruction and attempts at tissue repair. Such persistent inflammation is associated with many chronic human conditions and diseases, including allergy, atherosclerosis, cancer, arthritis and autoimmune diseases.
The processes by which acute inflammation is initiated and develops are well defined, but much less is known about the causes of chronic inflammation and the associated molecular and cellular pathways. This Insight highlights recent advances in our knowledge of the exogenous and endogenous inducers of chronic inflammation, as well as the inflammatory mediators and cells that are involved. We hope that these articles will contribute to a better understanding of inflammatory responses, and ultimately result in the design of more effective therapies for the numerous debilitating diseases with a chronic inflammatory component.
Nat Biotech 26 (7), 817-23 (Jul 2008)
Nature 447 (7145), 661-78 (07 Jun 2007)
Proceedings of the National Academy of Sciences of the United States of America, (23 Jun 2008)
The pathogenesis of chronic joint inflammation remains unclear, although the involvement of pathogen recognition receptors has been suggested recently. In the present article, we describe the role of two members of the NACHT-LRR (NLR) family, Nod1 (nucleotide-binding oligomerization domain) and Nod2 in a model of acute joint inflammation induced by intraarticular injection of Streptococcus pyogenes cell wall fragments. Here, we show that Nod2 deficiency resulted in reduced joint inflammation and protection against early cartilage damage. In contrast, Nod1 gene-deficient mice developed enhanced joint inflammation with concomitant elevated levels of proinflammatory cytokines and cartilage damage, consistent with a model in which Nod1 controls the inflammatory reaction. To explore whether the different function of Nod1 and Nod2 occurs also in humans, we exposed peripheral blood mononuclear cells (PBMCs) carrying either Nod1ins/del or Nod2fs mutation with SCW fragments in vitro. Production of both TNFalpha and IL-1beta was clearly impaired in PBMCs carrying the Nod2fs compared with PBMCs isolated from healthy controls. In line with results in Nod1 gene-deficient mice, PBMCs from individuals bearing a newly described Nod1 mutation produced enhanced levels of proinflammatory cytokines after 24-h stimulation with SCW fragments. These data indicate that the NLR family members Nod1 and Nod2 have different functions in controlling inflammation, and that intracellular Nod1-Nod2 interactions may determine the severity of arthritis in this experimental model. Whether a distorted balance between the function of Nod1 and/or Nod2 is involved in the pathogenesis of human autoinflammatory or autoimmune disease, such as rheumatoid arthritis, remains to be elucidated.
Annals of the rheumatic diseases 67 (6), 741-9 (Jun 2008)
Looks like they could have used some professional help with their "proteomics", but a good result nonetheless.
Nature 450 (7167), 299-303 (08 Nov 2007)
Proceedings of the National Academy of Sciences 101 (7), 2011-6 (17 Feb 2004)
Arthritis Research & Therapy 7 (5), R1001 (2005)
"in patients with RA a significant fraction of B cells showed a decreased expression of CXCR5 and CCR6 and increased levels of CXCR3."
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