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2015 ; 6
(13
): 11310-26
Nephropedia Template TP
gab.com Text
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English Wikipedia
Targeting myeloid cells in the tumor microenvironment enhances vaccine efficacy
in murine epithelial ovarian cancer
#MMPMID25888637
Khan AN
; Kolomeyevskaya N
; Singel KL
; Grimm MJ
; Moysich KB
; Daudi S
; Grzankowski KS
; Lele S
; Ylagan L
; Webster GA
; Abrams SI
; Odunsi K
; Segal BH
Oncotarget
2015[May]; 6
(13
): 11310-26
PMID25888637
show ga
Epithelial ovarian cancer (EOC) is typically diagnosed at advanced stages, and is
associated with a high relapse rate. Patients in remission are ideal candidates
for immunotherapy aimed at cure or prolonging disease-free periods. However,
immunosuppressive pathways in the tumor microenvironment are obstacles to durable
anti-tumor immunity. In a metastatic syngeneic mouse model of EOC,
immunosuppressive macrophages and myeloid-derived suppressor cells (MDSCs)
accumulate in the local tumor environment. In addition, resident peritoneal
macrophages from non-tumor-bearing mice were highly immunosuppressive, abrogating
stimulated T cell proliferation in a cell contact-dependent manner. Immunization
with microparticles containing TLR9 and NOD-2 ligands (MIS416) significantly
prolonged survival in tumor-bearing mice. The strategy of MIS416 immunization
followed by anti-CD11b administration further delayed tumor progression, thereby
establishing the proof of principle that myeloid depletion can enhance vaccine
efficacy. In patients with advanced EOC, ascites analysis showed substantial
heterogeneity in the relative proportions of myeloid subsets and their
immunosuppressive properties. Together, these findings point to immunosuppressive
myeloid cells in the EOC microenvironment as targets to enhance vaccination.
Further studies of myeloid cell accumulation and functional phenotypes in the EOC
microenvironment may identify patients who are likely to benefit from vaccination
combined with approaches that deplete tumor-associated myeloid cells.