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- W2114563504 abstract "The macrophage class A scavenger receptors, macrophage receptor with a collagenous structure (MARCO) and type I/II class A scavenger receptor (SR-AI/II), share structural features and roles in host defense, but little is known about their regulation and signaling properties. Ligation of MARCO on mouse thioglycollate-elicited peritoneal macrophages (PEMs) with immobilized mAb costimulated IL-12 production, in contrast to previously reported inhibition by SR-AI/II. PEMs from MARCO-deficient mice exhibited 2.7 times lower IL-12 production in responses to stimulation with LPS and IFN-gamma and lack of significant IL-12 production on stimulation with LPS alone. Conversely, SR-AI/II-deficient PEMs produced 2.4 and 1.8 times more IL-12 than wild-type PEMs in response to LPS or LPS and IFN-gamma, respectively. Corresponding differences in regulation of SR-A and MARCO expression were also observed. Th1 adjuvants (LPS, a CpG motif-containing oligodeoxynucleotide (CpG-ODN), IL-12, and GM-CSF) increased, whereas Th2-polarizing factors (IL-4, M-CSF, and non-CpG ODN) decreased expression of MARCO on J774 macrophage-like cells. Expression of SR-A was regulated in the opposite manner to MARCO or not affected. Whereas MARCO was involved in opsonin-independent phagocytosis in CpG-ODN-pretreated but not in IL-4-pretreated J774 cells, anti-SR-A Abs inhibited particle uptake in untreated and IL-4-pretreated but not in CpG-ODN-pretreated cells. SR-A and MARCO are regulated differently and mediate distinct negative and positive effects on IL-12 production in macrophages. These differences may contribute to sustained Th1 or Th2 polarization of ongoing immune responses." @default.
- W2114563504 created "2016-06-24" @default.
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- W2114563504 date "2005-12-15" @default.
- W2114563504 modified "2023-09-25" @default.
- W2114563504 title "Disparate Regulation and Function of the Class A Scavenger Receptors SR-AI/II and MARCO" @default.
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- W2114563504 doi "https://doi.org/10.4049/jimmunol.175.12.8032" @default.
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