Human Monocytes - CD14, CD16 - Ziegler-Heitbrock


Streptococcal m protein: a multipotent and powerful inducer of inflammation


Severe infections with Streptococcus pyogenes, an important human pathogen, are associated with massive inflammatory reactions in the human host. Here we show that streptococcal M protein interacts with TLR2 on human peripheral blood monocytes. As a consequence, monocytes express the cytokines IL-6, IL-1beta, and TNF-alpha. This response is significantly increased in the presence of neutrophil-derived heparin-binding protein (HBP), which costimulates monocytes by interacting with CD11/CD18. Analysis of tissue biopsies from patients with necrotizing fasciitis revealed recruitment of neutrophils and monocytes to the infectious site, combined with the release of HBP. The results show that M protein, in synergy with HBP, evokes an inflammatory response that may contribute to the profound pathophysiological consequences seen in severe streptococcal infections.

Authors: Pahlman LI, Morgelin M, Eckert J, Johansson L, Russell W, Riesbeck K, Soehnlein O, Lindbom L, Norrby-Teglund A, Schumann RR, Bjorck L, Herwald H
Journal: J Immunol., 177(2):1221-1228
Year: 2006
PubMed: Find in PubMed