JOURNAL ARTICLE
REVIEW

The systemic pro-inflammatory response in sepsis

Hanna Katrien de Jong, Tom van der Poll, Willem Joost Wiersinga
Journal of Innate Immunity 2010, 2 (5): 422-30
20530955
The systemic inflammatory response syndrome (SIRS) is the predominantly cytokine-mediated, pro-inflammatory response of the host to invading pathogens and is considered the hallmark sign of sepsis. Molecular components of this response can be divided into cytokines, plasma cascades and acute phase proteins while the predominant cellular components are leukocytes and the endothelium. High-throughput genetic profiling studies have led to increased insights into leukocyte regulation during sepsis. New players in the pro-inflammatory cytokine network include interleukin-17, high-mobility group box-1 protein, macrophage migration inhibitory factor, the myeloid-related proteins Mrp8 and Mrp14, and soluble triggering receptor expressed on myeloid cells-1. Activation of coagulation with concurrent downregulation of anticoagulant systems and fibrinolysis are almost universally present in septic patients with SIRS. Increasing evidence points to an extensive cross-talk between inflammation and coagulation, in which the protease-activated cell receptors play an important role. Sepsis causes excessive activation of the complement system in which C5a plays a key part. Further dissection of the role of host-pathogen interactions, the cytokine network, the coagulation cascade, the complement system and their multidirectional interactions in sepsis will pave the way for new treatment targets that can modify the excessive and collective activation of all these systems.

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