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Published on: March 14, 2016
Interleukin-6: Biology, signaling and strategies of blockade
Fred Schaper1, Stefan Rose-John2
1Institute of Biology, Otto-von-Guericke-University, Universitätsplatz 2, 39106 Magdeburg, Germany.
Abstract:
Interleukin-6 (IL-6) is one of the most important inflammatory cytokines. IL-6 is unique in signaling via a membrane bound and a soluble receptor. Intriguingly, these two pathways strongly differ in their biologic consequences. While classic IL-6 signaling via the membrane bound receptor is mainly regenerative and protective, IL-6 trans-signaling via the soluble IL-6R is rather pro-inflammatory. Intracellular signaling of IL-6 in response to receptor activation is through STAT-dependent and STAT-independent signaling modules, which are regulated by a complex regulatory network. The complex biology of IL-6 has consequences for therapeutic targeting of this cytokine. We hypothesize that specific inhibition of the trans-signaling pathway may be superior to global blockade of IL-6 activity with help of antibodies directed against IL-6 or IL-6R.
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