The cytokine-serum amyloid A-chemokine network

Cytokine Growth Factor Rev. 2016 Aug:30:55-69. doi: 10.1016/j.cytogfr.2015.12.010. Epub 2015 Dec 28.

Abstract

Levels of serum amyloid A (SAA), a major acute phase protein in humans, are increased up to 1000-fold upon infection, trauma, cancer or other inflammatory events. However, the exact role of SAA in host defense is yet not fully understood. Several pro- and anti-inflammatory properties have been ascribed to SAA. Here, the regulated production of SAA by cytokines and glucocorticoids is discussed first. Secondly, the cytokine and chemokine inducing capacity of SAA and its receptor usage are reviewed. Thirdly, the direct (via FPR2) and indirect (via TLR2) chemotactic effects of SAA and its synergy with chemokines are unraveled. Altogether, a complex cytokine-SAA-chemokine network is established, in which SAA plays a key role in regulating the inflammatory response.

Keywords: Chemotaxis; Cytokines; FPR2; SAA; TLR2.

Publication types

  • Review
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cytokines / metabolism*
  • Humans
  • Liver / metabolism
  • Serum Amyloid A Protein / metabolism*
  • Signal Transduction

Substances

  • Cytokines
  • Serum Amyloid A Protein