Cell death induction by CTL: perforin/granzyme B system dominantly acts for cell death induction in human hepatocellular carcinoma cells.
Cell death induction by cytotoxic T lymphocytes (CTLs) is an important thesis for the understanding of tumor immunotherapy. In the current study we investigated the molecular machinery of CTL-induced cell death in human hepatocellular carcinoma cell lines (HCC lines). CTLs prepared from human peripheral blood induced cell death in all tested HCC lines. As the CTL-induced death system, the effectiveness of Fas ligand/Fas and/or Perforin/Granzyme B systems has been suggested, whereas cell death induction by CTLs was shown independently on Fas expression in the current study. Using various tetrapeptide inhibitors for caspase and its associated factor, we additionally demonstrated that inhibitors for caspase 3 (Ac-DEVD-CHO) and caspase 8/granzyme B (Ac-IETD-CHO) suppressed CTL-induced cell death, but an inhibitor for Fas-activated serine proteinase, which acts for the caspase 3 activator, did not, suggesting that CTL-induced cell death was initiated by the Perforin/Granzyme B system, rather than the Fas ligand/Fas system. On the basis of our current results, we report here that the Perforin/Granzyme B system acts dominantly for the cell death induction of HCC lines.
Hayashida
M
M
Cell Death Research Project, Basic Technology Research Laboratory, Daiichi Pharmaceutical Co., Ltd., Tokyo R&D Center, Tokyo 134-8630, Japan.
Kawano
H
H
Nakano
T
T
Shiraki
K
K
Suzuki
A
A
D000818:Animals; D053148:Caspase 3; D053181:Caspase 8; D053453:Caspase 9; D061945:Caspase Inhibitors; D020169:Caspases / Q000502:physiology; D016923:Cell Death / Q000502:physiology*; D003602:Cytotoxicity, Immunologic; D053222:Fas Ligand Protein; D053804:Granzymes; D006801:Humans; D007167:Immunotherapy; D008114:Liver Neoplasms, Experimental / Q000276:immunology* / Q000473:pathology* / Q000628:therapy; D008562:Membrane Glycoproteins / Q000502:physiology*; D054353:Perforin; D052899:Pore Forming Cytotoxic Proteins; D012697:Serine Endopeptidases / Q000502:physiology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014407:Tumor Cells, Cultured; D019014:fas Receptor / Q000502:physiology
D061945:Caspase Inhibitors; C505661:FASLG protein, human; D053222:Fas Ligand Protein; D008562:Membrane Glycoproteins; D052899:Pore Forming Cytotoxic Proteins; D019014:fas Receptor; D054353:Perforin; C509213:GZMB protein, human; D053804:Granzymes; D012697:Serine Endopeptidases; C505407:CASP3 protein, human; C505530:CASP8 protein, human; C506433:CASP9 protein, human; D053148:Caspase 3; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases