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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+Autoimmun
2014 ; 53
(ä): 78-84
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The Mertk receptor tyrosine kinase promotes T-B interaction stimulated by IgD
B-cell receptor cross-linking
#MMPMID24768065
Shao WH
; Zhen Y
; Finkelman FD
; Cohen PL
J Autoimmun
2014[Sep]; 53
(ä): 78-84
PMID24768065
show ga
The Mertk receptor tyrosine kinase facilitates macrophage and DC apoptotic-cell
clearance and regulates immune tolerance. Mertk may also contribute to B-cell
activation, because Mertk-KO mice fail to develop autoantibodies when
allo-activated by T cells. We investigated this possibility with a
well-characterized model in which injection of mice with goat anti-IgD antibody
causes membrane IgD cross-linking that induces T-independent B cell activation
and antigen presentation to T cells. Goat anti-mouse IgD antibody-injected
C57BL/6 Mertk-KO mice had normal initial B cell activation and proliferation, but
significantly lower T cell activation and proliferation, as well as lower IgE and
IgG anti-goat IgG responses, as compared to C57BL/6 WT controls. B cell antigen
processing, analyzed by evaluating B cell fluorescence following injection of
monoclonal anti-IgD antibody labeled with biotin or FITC, was comparable between
Mertk-KO mice and WT mice. IgD Ab primed B cells from Mertk-KO mice exhibited
significantly lower ability in activating memory T cells isolated from WT mice
injected with the same antigen 10 days before. These observations suggest that
Mertk expression is required for optimal B-cell antigen presentation, which is,
in turn, required in this model for optimal T cell activation and subsequent T
cell-dependent B cell differentiation.