Abstract
Antigen-antibody complexes can be formed both intravascularly and perivascularly and damage tissues by inducing inflammatory mechanisms. Recent studies have characterized a definite sequence of steps involved in these inflammatory mechanisms, and identified the predominance of particular chemical mediator(s) in each step. The lesions associated with this type of inflammation are characterized by the early development of plasma leakage, followed by the recruitment of polymorphonuclear leukocytes mediated by chemokines generated by FcgammaR-dependent mechanisms. The development of these lesions is modulated by endothelial cell-derived paracrine mediators, and activation of the coagulation system can ensue. The activation of platelets and coagulation, if not properly counterbalanced by fibrinolysis, might be a major factor for the late development of fibrotic changes and organ remodeling.
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