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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2014 ; 192
(12
): 5789-5801
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Targeting antigens through blood dendritic cell antigen 2 on plasmacytoid
dendritic cells promotes immunologic tolerance
#MMPMID24829416
Chappell CP
; Giltiay NV
; Draves KE
; Chen C
; Hayden-Ledbetter MS
; Shlomchik MJ
; Kaplan DH
; Clark EA
J Immunol
2014[Jun]; 192
(12
): 5789-5801
PMID24829416
show ga
The C-type lectin receptor blood dendritic cell Ag 2 (BDCA2) is expressed
exclusively on human plasmacytoid DCs (pDCs) and plays a role in Ag capture,
internalization, and presentation to T cells. We used transgenic mice that
express human BDCA2 and anti-BDCA2 mAbs to deliver Ags directly to BDCA2 on pDCs
in vivo. Targeting Ag to pDCs in this manner resulted in significant suppression
of Ag-specific CD4(+) T cell and Ab responses upon secondary exposure to Ag in
the presence of adjuvant. Suppression of Ab responses required both a decrease in
effector CD4(+) T cells and preservation of Foxp3(+) regulatory T cells (Tregs).
Reduction in Treg numbers following Ag delivery to BDCA2 restored both CD4(+) T
cell activation and Ab responses, demonstrating that Tregs were required for the
observed tolerance. Our results demonstrate that Ag delivery to pDCs through
BDCA2 is an effective method to induce immunological tolerance, which may be
useful for treating autoimmune diseases or to inhibit unwanted Ab responses.