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2017 ; 14
(5
): 6177-6183
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Cancer cell-expressed B7-H3 regulates the differentiation of tumor-associated
macrophages in human colorectal carcinoma
#MMPMID29113264
Mao Y
; Chen L
; Wang F
; Zhu D
; Ge X
; Hua D
; Sun J
Oncol Lett
2017[Nov]; 14
(5
): 6177-6183
PMID29113264
show ga
Co-stimulatory molecule B7 homolog 3 protein (B7-H3) has been described as an
important tumor antigen in various human tumors. The exact role of B7-H3 in tumor
progression and its receptor are still ambiguous. The phenotype and the function
of tumor-associated macrophages (TAMs) in human solid tumors are complicated and
could contribute to the shaping of the tumor microenvironment. In the present
study, B7-H3 expression and lymphocyte infiltration were investigated by
immunohistochemistry in 117 colorectal carcinoma (CRC) patients. B7-H3 expression
was positively associated with the infiltrating density of macrophage in CRC
tissues, and B7-H3 expression and the infiltrating density of macrophages were
negatively associated with the overall survival rate of patients. The putative
B7-H3 receptor was found on activated monocytes and macrophages, indicating the
direct function of B7-H3 signal on macrophages. Additional results revealed that
during the differentiation of TAMs, B7-H3 promoted the polarization of type 2
macrophages (M2s) and switch of the M1 phenotype to the M2 phenotype. Thus, B7-H3
signaling promotes M2 differentiation via the putative receptor on monocytes and
macrophages. Targeting the manipulation of TAMs through the B7-H3 pathway may be
valuable for the development of novel immunotherapeutic strategies against human
CRC.