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Published 29 April 2002. doi:10.1083/jcb.200109094
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© The Rockefeller University Press, 0021-9525/2002/4/455 $5.00
The Journal of Cell Biology, Volume 157, Number 3, April 29, 2002 455-468


Article

DAP kinase and DRP-1 mediate membrane blebbing and the formation of autophagic vesicles during programmed cell death



Boaz Inbal1, Shani Bialik1, Ilana Sabanay2, Gidi Shani1 and Adi Kimchi1

1 Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel
2 Electron Microscopy Center, Weizmann Institute of Science, Rehovot 76100, Israel

Address correspondence to Adi Kimchi, Dept. of Molecular Genetics, Weizmann Institute of Science, Rehovot 76100, Israel. Tel.: 972-8-9342428. Fax: 972-8-9315938. E-mail: Adi.kimchi{at}weizmann.ac.il

Death-associated protein kinase (DAPk) and DAPk-related protein kinase (DRP)-1 proteins are Ca+2/calmodulin–regulated Ser/Thr death kinases whose precise roles in programmed cell death are still mostly unknown. In this study, we dissected the subcellular events in which these kinases are involved during cell death. Expression of each of these DAPk subfamily members in their activated forms triggered two major cytoplasmic events: membrane blebbing, characteristic of several types of cell death, and extensive autophagy, which is typical of autophagic (type II) programmed cell death. These two different cellular outcomes were totally independent of caspase activity. It was also found that dominant negative mutants of DAPk or DRP-1 reduced membrane blebbing during the p55/tumor necrosis factor receptor 1–induced type I apoptosis but did not prevent nuclear fragmentation. In addition, expression of the dominant negative mutant of DRP-1 or of DAPk antisense mRNA reduced autophagy induced by antiestrogens, amino acid starvation, or administration of interferon-{gamma}. Thus, both endogenous DAPk and DRP-1 possess rate-limiting functions in these two distinct cytoplasmic events. Finally, immunogold staining showed that DRP-1 is localized inside the autophagic vesicles, suggesting a direct involvement of this kinase in the process of autophagy.

Key Words: DAP kinase; DRP-1; autophagy; membrane blebbing; programmed cell death


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