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1988 ; 79
(3
): 375-83
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The mechanisms of cytotoxicity to tumor cells by polymorphonuclear leukocytes
stimulated with cytokines
#MMPMID3131285
Hayashi T
; Arai S
; Sendo F
Jpn J Cancer Res
1988[Mar]; 79
(3
): 375-83
PMID3131285
show ga
The mechanisms of tumor cytotoxicity of rat polymorphonuclear leukocytes (PMN)
activated with cytokine(s) were studied with the use of supernatants from a rat
myelomonocytic leukemia cell line, WRT-7, incubated in the presence of bacterial
lipopolysaccharide (LPS) (LPS WRT-7 sup) as a source of cytokine. Rat peritoneal
PMN treated with LPS WRT-7 sup showed cytostasis from 3 hr after the start of
incubation, while significant cytolysis was first observed after 24 hr. When
target tumor cells were separated from PMN at 6 or 12 hr after the start of the
assay, 3H-UdR release from the separated target cells comparable to that from the
group incubated with PMN for the whole assay time of 40 hr was observed during
the following incubation, which indicates that priming for subsequent lysis
occurs at a relatively early stage of the assay. None of various scavengers of
active oxygens, inhibitors of heme enzymes, and inhibitors of neutral proteinases
inhibited cytolysis mediated by PMN stimulated with LPS WRT-7 sup. Heparin
inhibited PMN cytolysis only when it was added within 1 hr after the start of the
assay. Fractionation of heparin by ion exchange chromatography showed a
parallelism between the negative charge and the inhibitory effect of heparin on
PMN cytotoxicity.