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2016 ; 2
(ä): 16069
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Proteolytic inactivation of nuclear alarmin high-mobility group box 1 by
complement protease C1s during apoptosis
#MMPMID27648302
Yeo JG
; Leong J
; Arkachaisri T
; Cai Y
; Teo BH
; Tan JH
; Das L
; Lu J
Cell Death Discov
2016[]; 2
(ä): 16069
PMID27648302
show ga
Effective clearance of apoptotic cells by phagocytes prevents the release of
intracellular alarmins and manifestation of autoimmunity. This prompt
efferocytosis is complemented by intracellular proteolytic degradation that
occurs within the apoptotic cells and in the efferosome of the phagocytes.
Although the role of extracellular proteases in apoptotic cells clearance is
unknown, the strong association of congenital C1s deficiency with Systemic Lupus
Erythematosus highlights the protective nature that this extracellular protease
has against autoimmunity. The archetypical role of serine protease C1s as the
catalytic arm of C1 complex (C1qC1r2C1s2) involve in the propagation of the
classical complement pathway could not provide the biological basis for this
association. However, a recent observation of the ability of C1 complex to cleave
a spectrum of intracellular cryptic targets exposed during apoptosis provides a
valuable insight to the underlying protective mechanism. High-mobility group box
1 (HMGB1), an intracellular alarmin that is capable of inducing the formation of
antinuclear autoantibodies and causes lupus-like conditions in mice, is
identified as a novel potential target by bioinformatics analysis. This is
verified experimentally with C1s, both in its purified and physiological form as
C1 complex, cleaving HMGB1 into defined fragments of 19 and 12?kDa. This cleavage
diminishes HMGB1 ability to enhance lipopolysaccharide mediated pro-inflammatory
cytokines production from monocytes, macrophages and dendritic cells. Further
mass spectrometric analysis of the C1 complex treated apoptotic cellular proteins
demonstrated additional C1s substrates and revealed the complementary role of C1s
in apoptotic cells clearance through the proteolytic cleavage of intracellular
alarmins and autoantigens. C1 complex may have evolved as, besides the
bacteriolytic arm of antibodies in which it activates the complement cascade, a
tissue renewal mechanism that reduces the immunogenicity of apoptotic tissue
debris and decreases the likelihood of autoimmunity.