The regulatory roles of C1q.

Abstract:

:C1q binds to immune complexes to elicit complement-dependent microbial killing and enhance phagocytosis. Besides this classical role, C1q also opsonizes apoptotic cells for clearance by phagocytes. C1q deficiency increases susceptibility to microbial infections and is also associated with elevated autoimmunity as characterized by increased apoptotic bodies in tissues. Most complement proteins are of liver origin, but C1q is predominantly synthesized by peripheral tissue macrophages and dendritic cells. Besides being found in the blood, C1q has also been found deposited in extracellular tissues around these cells. In vitro, immobilized C1q inhibits monocyte, macrophage and T-cell production of inflammatory cytokines. It also regulates T-cell activation. Therefore, mounting evidence suggest a major regulatory role for C1q in inflammation and autoimmunity.

journal_name

Immunobiology

journal_title

Immunobiology

authors

Lu J,Wu X,Teh BK

doi

10.1016/j.imbio.2006.11.008

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

245-52

issue

4-5

eissn

0171-2985

issn

1878-3279

pii

S0171-2985(06)00143-4

journal_volume

212

pub_type

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