In vitro- and ex vivo-derived cytolytic leukocytes from granzyme A x B double knockout mice are defective in granule-mediated apoptosis but not lysis of target cells

被引:165
作者
Simon, MM
Hausmann, M
Tran, T
Ebnet, K
Tschopp, J
ThaHla, R
Mullbacher, A
机构
[1] UNIV LAUSANNE, INST BIOCHEM, CH-1066 EPALINGES, SWITZERLAND
[2] AUSTRALIAN NATL UNIV, JOHN CURTIN SCH MED RES, DIV CELL BIOL & IMMUNOL, CANBERRA, ACT 2601, AUSTRALIA
关键词
D O I
10.1084/jem.186.10.1781
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Granzyme (gzm) A and gzmB have been implicated in Fas-independent nucleolytic and cytolytic processes exerted by cytotoxic T (Tc) cells, but the underlying mechanism(s) remains unclear. In this study, we compare the potential of Tc and natural killer (NK) cells of mice deficient in both gzmA and B (gzmAXB(-/-)) with those from single knockout mice deficient in gzmA ((-/-)), gzmB (-/-), or perforin (-/-) to induce nuclear damage and lysis in target cells. With the exception of perforin(-/-), all in vitro-and ex vivo-derived Tc and NK cell populations from the mutant strains induced Cr-51-release in target-cells at levels and with kinetics similar to those of normal mice. This contrasts with their capacity to induce apoptotic nuclear damage in target cells. In gzmA X B-/- mice, Tc/NK-mediated target sell DNA fragmentation was not observed, even after extended incubation periods (10 h), but was normal in gzmA-deficient and only impaired in gzmB-deficient mice in short-term (2-4 h), but not long-term (4-10 h), nucleolytic assays. This suggests that gzmA and B are critical for Tc/NK granule-mediated nucleolysis, with gzmB being the main contributor, while target cell lysis is due solely to perforin and independent of both proteases.
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页码:1781 / 1786
页数:6
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