Different pathways of the release of cytotoxic proteins in LAK cells.
Human LAK cells were shown to release cytotoxic proteins by both Ca(2+)-dependent and Ca(2+)-independent mechanisms. CD3+ CD8+ CD16- and CD16+ CD8+ CD3- LAK cells were co-incubated with target cells in the presence of 4 mM EGTA. Although EGTA inhibited the exocytosis of cytolytic granules, supernatants obtained were cytotoxic for target cells. Cytotoxicity of CD3+ LAK cells and CD16+ LAK cells was due to cytotoxic proteins with MW 75 (p75), 35 (p35) and 22 (p22) kDa. LAK cells were also shown to release cytotoxic proteins by way of continuous secretion. After co-incubation in the absence of target cells LAK cells can secrete cytotoxic proteins with MW 75 (p75), 55 (p55), 38 (p38), 35 (p35), 25 (p25), 22 (p22) and 17 (p17) kDa.
Sashchenko
L P
LP
Institute of Gene Biology, Russian Academy of Sciences, Moscow, Russia.
Lukyanova
T I
TI
Kabanova
O D
OD
Mirkina
I
I
Yatskin
O N
ON
Pongor
S
S
Gnuchev
N V
NV
D017252:CD3 Complex / Q000276:immunology*; D002118:Calcium / Q000494:pharmacology*; D000090266:Chromobox Protein Homolog 5; D003601:Cytotoxicity Tests, Immunologic; D004533:Egtazic Acid / Q000494:pharmacology; D053804:Granzymes; D006801:Humans; D015979:Killer Cells, Lymphokine-Activated / Q000187:drug effects / Q000276:immunology*; D011506:Proteins / Q000737:chemistry / Q000276:immunology; D017452:Receptors, IgG / Q000276:immunology*; D012697:Serine Endopeptidases / Q000276:immunology; D015398:Signal Transduction / Q000276:immunology*; D014407:Tumor Cells, Cultured
C000715594:CBX5 protein, human; D017252:CD3 Complex; D011506:Proteins; D017452:Receptors, IgG; D000090266:Chromobox Protein Homolog 5; D004533:Egtazic Acid; D053804:Granzymes; D012697:Serine Endopeptidases; C509212:GZMA protein, human; D002118:Calcium