The Journal of Experimental Medicine
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Published online 13 November 2000.
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© The Rockefeller University Press, 0022-1007/2000/11/1403/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 10, November 20, 2000 1403-1414


Original Article

Initiation of Apoptosis by Granzyme B Requires Direct Cleavage of Bid, but Not Direct Granzyme B–mediated Caspase Activation

Vivien R. Suttona, Joanne E. Davisa, Michael Cancillab, Ricky W. Johnstonea, Astrid A. Rueflia, Karin Sedeliesa, Kylie A. Brownea, and Joseph A. Trapania
a Cancer Immunology Laboratory, Peter MacCallum Cancer Institute, Melbourne 8006, Australia
b The Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Melbourne 3050, Australia

Correspondence to: Joseph A. Trapani, Peter MacCallum Cancer Institute, Locked Bag 1, A'Beckett St., Melbourne 8006, Australia. Tel:61-3-9656-3726 Fax:61-3-9656-1411

The essential upstream steps in granzyme B–mediated apoptosis remain undefined. Herein, we show that granzyme B triggers the mitochondrial apoptotic pathway through direct cleavage of Bid; however, cleavage of procaspases was stalled when mitochondrial disruption was blocked by Bcl-2. The sensitivity of granzyme B–resistant Bcl-2–overexpressing FDC-P1 cells was restored by coexpression of wild-type Bid, or Bid with a mutation of its caspase-8 cleavage site, and both types of Bid were cleaved. However, Bid with a mutated granzyme B cleavage site remained intact and did not restore apoptosis. Bid with a mutation preventing its interaction with Bcl-2 was cleaved but also failed to restore apoptosis. Rapid Bid cleavage by granzyme B (<2 min) was not delayed by Bcl-2 overexpression. These results clearly placed Bid cleavage upstream of mitochondrial Bcl-2. In granzyme B–treated Jurkat cells, endogenous Bid cleavage and loss of mitochondrial membrane depolarization occurred despite caspase inactivation with z-Val-Ala-Asp-fluoromethylketone or Asp-Glu-Val-Asp-fluoromethylketone. Initial partial processing of procaspase-3 and -8 was observed irrespective of Bcl-2 overexpression; however, later processing was completely abolished by Bcl-2. Overall, our results indicate that mitochondrial perturbation by Bid is necessary to achieve a lethal threshold of caspase activity and cell death due to granzyme B.

Key Words: granzyme B, Bid, apoptosis, Bcl-2, perforin


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