Immunologic Research

, Volume 24, Issue 2, pp 191–199

Mechanism of signal transduction activated by sublytic assembly of terminal complement complexes on nucleated cells

  • Florin Niculescu
  • Horea Rus
Article

Abstract

The sublytic assembly of C5b-7, C5b-8, and C5b-9, activates membrane phospholipases through heterotrimeric G proteins and stimulates a variety of cellular activities including prostanoids, leukotrienes, and cytokines synthesis. Activation of mitotic signaling through Ras, Raf-1, ERK 1, and phosphatidylinositol-3 kinase (P13-K) was induced in B lymphocytes, endothelial, and smooth muscle cells. P13-K activation by C5b-9 induced STAT3 phosphorylation and translocation from cytoplasm to nucleus. This complex signaling mechanism is directly involved in many biological functions such as endo-and exoxytosis, cell cycle progression, activation of transcription, and protein synthesis. The key role of this signaling pathway is reflected on cell survival and proliferation in acute and chronic inflammation where complement activation is an ubiquitous event.

Key Words

Complement Activation ERK1 PI-3 Kinase STAT3 Terminal Complement Complexes B Lymphocytes Endothelial Cells Smooth Muscle Cells 

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Copyright information

© Humana Press Inc 2001

Authors and Affiliations

  • Florin Niculescu
    • 1
  • Horea Rus
    • 1
  1. 1.School of MedicineUniversity of MarylandBaltimoreMD

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