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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+Leukoc+Biol
2014 ; 96
(5
): 883-94
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Liver metastases induce reversible hepatic B cell dysfunction mediated by
Gr-1+CD11b+ myeloid cells
#MMPMID25085111
Thorn M
; Point GR
; Burga RA
; Nguyen CT
; Joseph Espat N
; Katz SC
J Leukoc Biol
2014[Nov]; 96
(5
): 883-94
PMID25085111
show ga
LM escape immune surveillance, in part, as a result of the expansion of CD11b+MC,
which alter the intrahepatic microenvironment to promote tumor tolerance. HBC
make up a significant proportion of liver lymphocytes and appear to delay tumor
progression; however, their significance in the setting of LM is poorly defined.
Therefore, we characterized HBC and HBC/CD11b+MC interactions using a murine
model of LM. Tumor-bearing livers showed a trend toward elevated absolute numbers
of CD19+ HBC. A significant increase in the frequency of IgM(lo)IgD(hi) mature
HBC was observed in mice with LM compared with normal mice. HBC derived from
tumor-bearing mice demonstrated increased proliferation in response to TLR and
BCR stimulation ex vivo compared with HBC from normal livers. HBC from
tumor-bearing livers exhibited significant down-regulation of CD80 and were
impaired in inducing CD4(+) T cell proliferation ex vivo. We implicated hepatic
CD11b+MC as mediators of CD80 down-modulation on HBC ex vivo via a
CD11b-dependent mechanism that required cell-to-cell contact and STAT3 activity.
Therefore, CD11b+MC may compromise the ability of HBC to promote T cell
activation in the setting of LM as a result of diminished expression of CD80.
Cross-talk between CD11b+MC and HBC may be an important component of LM-induced
immunosuppression.