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2018 ; 9
(ä): 1684
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Tumor Killing by CD4(+) T Cells Is Mediated via Induction of Inducible Nitric
Oxide Synthase-Dependent Macrophage Cytotoxicity
#MMPMID30083157
Fauskanger M
; Haabeth OAW
; Skjeldal FM
; Bogen B
; Tveita AA
Front Immunol
2018[]; 9
(ä): 1684
PMID30083157
show ga
CD4(+) T cells can induce potent anti-tumor immune responses. Due to the lack of
MHC class II expression in most cancer cells, antigen recognition occurs
indirectly via uptake and presentation on tumor-infiltrating antigen-presenting
cells (APCs). Activation of the APCs can induce tumor rejection, but the
mechanisms underlying tumor killing by such cells have not been established. To
elucidate the molecular basis of CD4(+) T-cell-mediated tumor rejection, we
utilized a murine model of multiple myeloma, in which the T cells recognize a
secreted tumor neoantigen. Our findings demonstrate that T cell recognition
triggers inducible nitric oxide synthase activity within tumor-infiltrating
macrophages. Diffusion of nitric oxide into surrounding tumor cells results in
intracellular accumulation of toxic secondary oxidants, notably peroxynitrite.
This results in tumor cell apoptosis through activation of the mitochondrial
pathway. We find that this mode of cytotoxicity has strict spatial limitations,
and is restricted to the immediate surroundings of the activated macrophage, thus
limiting bystander killing. These findings provide a molecular basis for
macrophage-mediated anti-tumor immune responses orchestrated by CD4(+) T cells.
Since macrophages are abundant in most solid tumors, evoking the secretion of
nitric oxide by such cells may represent a potent therapeutic strategy.