Cytotoxicity assay
The ADCC activity of FAC in vitro was measured by lactase dehydrogenase
(LDH)-releasing assay, using the CytoTox 96 non-Radioactive
Cytotoxicity Assay kit (Promega, Beijing, China) according to the manufacturer’s
instructions. Human erythroleukemic cells K562 and SMMC-
7721 cells were used as the target cells and were placed in 96 wellplates
at 5 104 cells per well. The effector cells NK-92 were incubated
with different doses of FAC for 72 h. After washing, the cells were cultured
with K562 cells or SMMC-7721 cells at various E:T ratios, effector
to target ratios, (1:1, 5:1 or 10:1) in a 5% CO2 incubator for 24 h at 37 °C.
The cell lysis was determined by measuring the amount of released
LDH in culture supernatants. The maximum LDH release was determined
by lysis in 0.2% Triton-X100. Cytotoxicity was calculated as
follows: % cytotoxicity¼[(experimental)(effector spontaneous)(target
spontaneous)]/[(target maximum)(target spontaneous)] 100.
158
Cytotoxicity assayThe ADCC activity of FAC in vitro was measured by lactase dehydrogenase(LDH)-releasing assay, using the CytoTox 96 non-RadioactiveCytotoxicity Assay kit (Promega, Beijing, China) according to the manufacturer’sinstructions. Human erythroleukemic cells K562 and SMMC-7721 cells were used as the target cells and were placed in 96 wellplatesat 5 104 cells per well. The effector cells NK-92 were incubatedwith different doses of FAC for 72 h. After washing, the cells were culturedwith K562 cells or SMMC-7721 cells at various E:T ratios, effectorto target ratios, (1:1, 5:1 or 10:1) in a 5% CO2 incubator for 24 h at 37 °C.The cell lysis was determined by measuring the amount of releasedLDH in culture supernatants. The maximum LDH release was determinedby lysis in 0.2% Triton-X100. Cytotoxicity was calculated asfollows: % cytotoxicity¼[(experimental)(effector spontaneous)(targetspontaneous)]/[(target maximum)(target spontaneous)] 100.158
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