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2011 ; 11
(7
): 794-801
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The role of myeloid receptors on murine plasmacytoid dendritic cells in induction
of type I interferon
#MMPMID21281752
Seeds RE
; Mukhopadhyay S
; Jones IM
; Gordon S
; Miller JL
Int Immunopharmacol
2011[Jul]; 11
(7
): 794-801
PMID21281752
show ga
This study tested the hypothesis that a set of predominantly myeloid restricted
receptors (F4/80, CD36, Dectin-1, CD200 receptor and mannan binding lectins) and
the broadly expressed CD200 played a role in a key function of plasmacytoid DC
(pDC), virally induced type I interferon (IFN) production. The Dectin-1 ligands
zymosan, glucan phosphate and the anti-Dectin-1 monoclonal antibody (mAb) 2A11
had no effect on influenza virus induced IFN?/? production by murine splenic pDC.
However, mannan, a broad blocking reagent against mannose specific receptors,
inhibited IFN?/? production by pDC in response to inactivated influenza virus.
Moreover, viral glycoproteins (influenza virus haemagglutinin and HIV-1 gp120)
stimulated IFN?/? production by splenocytes in a mannan-inhibitable manner,
implicating the function of a lectin in glycoprotein induced IFN production.
Lastly, the effect of CD200 on IFN induction was investigated. CD200 knock-out
macrophages produced more IFN? than wild-type macrophages in response to polyI:C,
a MyD88-independent stimulus, consistent with CD200's known inhibitory effect on
myeloid cells. In contrast, blocking CD200 with an anti-CD200 mAb resulted in
reduced IFN? production by pDC-containing splenocytes in response to CpG and
influenza virus (MyD88-dependent stimuli). This suggests there could be a
differential effect of CD200 on MyD88 dependent and independent IFN induction
pathways in pDC and macrophages. This study supports the hypothesis that a
mannan-inhibitable lectin and CD200 are involved in virally induced type I IFN
induction.