Limitations of bystander killing in Th1/M1 immune responses against a secreted tumor antigen.
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ABSTRACT: T-cell recognition of tumor antigens presented on tumor-infiltrating macrophages (TAMs) induces a tumoricidal M1-like phenotype. Resultant indirect immune responses could eliminate not only antigen secreting (Ag(POS)), but also antigen negative (Ag(NEG)) tumor cells via bystander killing. Such broad-spectrum response could eliminate antigenically heterogeneous tumors. Using an in vivo model of CD4(+) T-cell mediated immunity against MHC II negative myeloma cells, bystander killing of Ag(NEG) cells was ineffective due to strict spatial constraints of Th1-induced TAM cytotoxicity.
SUBMITTER: Tveita AA
PROVIDER: S-EPMC4292458 | biostudies-other | 2014 Oct
REPOSITORIES: biostudies-other
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