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2009 ; 182
(3
): 1397-403
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Macrophages activated by C-reactive protein through Fc gamma RI transfer
suppression of immune thrombocytopenia
#MMPMID19155486
Marjon KD
; Marnell LL
; Mold C
; Du Clos TW
J Immunol
2009[Feb]; 182
(3
): 1397-403
PMID19155486
show ga
C-reactive protein (CRP) is an acute-phase protein with therapeutic activity in
mouse models of systemic lupus erythematosus and other inflammatory and
autoimmune diseases. To determine the mechanism by which CRP suppresses immune
complex disease, an adoptive transfer system was developed in a model of immune
thrombocytopenic purpura (ITP). Injection of 200 microg of CRP 24 h before
induction of ITP markedly decreased thrombocytopenia induced by anti-CD41.
CRP-treated splenocytes also provided protection from ITP in adoptive transfer.
Splenocytes from C57BL/6 mice were treated with 200 microg/ml CRP for 30 min,
washed, and injected into mice 24 h before induction of ITP. Injection of 10(6)
CRP-treated splenocytes protected mice from thrombocytopenia, as did i.v.
Ig-treated but not BSA-treated splenocytes. The suppressive cell induced by CRP
was found to be a macrophage by depletion, enrichment, and the use of purified
bone marrow-derived macrophages. The induction of protection by CRP-treated cells
was dependent on FcRgamma-chain and Syk activation, indicating an activating
effect of CRP on the donor cell. Suppression of ITP by CRP-treated splenocytes
required Fc gamma RI on the donor cell and Fc gamma RIIb in the recipient mice.
These findings suggest that CRP generates suppressive macrophages through Fc
gamma RI, which then act through an Fc gamma RIIb-dependent pathway in the
recipient to decrease platelet clearance. These results provide insight into the
mechanism of CRP regulatory activity in autoimmunity and suggest a potential new
therapeutic approach to ITP.
|*Adoptive Transfer
[MESH]
|Animals
[MESH]
|Autoimmune Diseases/immunology/metabolism/prevention & control
[MESH]