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2015 ; 5
(ä): 12255
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Regulatory B cells preferentially accumulate in tumor-draining lymph nodes and
promote tumor growth
#MMPMID26193241
Ganti SN
; Albershardt TC
; Iritani BM
; Ruddell A
Sci Rep
2015[Jul]; 5
(ä): 12255
PMID26193241
show ga
Our previous studies found that B16-F10 melanoma growth in the rear footpad of
immunocompetent mice induces marked B cell accumulation within tumor-draining
popliteal lymph nodes (TDLN). This B cell accumulation drives TDLN remodeling
that precedes and promotes metastasis, indicating a tumor-promoting role for TDLN
B cells. Here we show that phenotypic characterization of lymphocytes in mice
bearing B16-F10 melanomas identifies preferential accumulation of T2-MZP B cells
in the TDLN. Comparison of non-draining LNs and spleens of tumor-bearing mice
with LNs and spleens from naïve mice determined that this pattern of B cell
accumulation was restricted to the TDLN. B cell-deficient and immunocompetent
mice reconstituted with T2-MZP B cells but not with other B cell subsets
displayed accelerated tumor growth, demonstrating that T2-MZP B cells possess
regulatory activity in tumor-bearing mice. Unlike splenic regulatory B cells,
however, these TDLN B cells did not exhibit increased IL-10 production, nor did
they promote Treg generation in the TDLN. These findings demonstrate that tumors
initially signal via the lymphatic drainage to stimulate the preferential
accumulation of T2-MZP regulatory B cells. This local response may be an early
and critical step in generating an immunosuppressive environment to permit tumor
growth and metastasis.