Cathepsin B Acts as a Dominant Execution Protease in Tumor Cell Apoptosis Induced by Tumor Necrosis Factor

Journal of Cell Biology - Tập 153 Số 5 - Trang 999-1010 - 2001
Lasse Foghsgaard1, Dorte Wissing2, Daniel Mauch3, Ulrik Lademann2, Lone Bastholm4, Marianne Boes5, Folmer Elling4, Marcel Leist3,6, Marja Jäättelä2
1Apoptosis Laboratory, Danish Cancer Society, Strandboulevarden 49, DK-2100 Copenhagen, Denmark
2aApoptosis Laboratory, Danish Cancer Society, Copenhagen, Denmark
3bDepartment of Molecular Toxicology, University of Konstanz, Konstanz, Germany
4Institute of Molecular Pathology, University of Copenhagen, Copenhagen, Denmark
5dDepartment of Pathology, Harvard Medical School, Boston, Massachusetts
6eH. Lundbeck A/S, Valby, Denmark

Tóm tắt

Death receptors can trigger cell demise dependent or independent of caspases. In WEHI-S fibrosarcoma cells, tumor necrosis factor (TNF) induced an increase in cytosolic cathepsin B activity followed by death with apoptotic features. Surprisingly, this process was enhanced by low, but effectively inhibiting, concentrations of pan-caspase inhibitors. Contrary to caspase inhibitors, a panel of pharmacological cathepsin B inhibitors, the endogenous cathepsin inhibitor cystatin A as well as antisense-mediated depletion of cathepsin B rescued WEHI-S cells from apoptosis triggered by TNF or TNF-related apoptosis-inducing ligand. Thus, cathepsin B can take over the role of the dominant execution protease in death receptor-induced apoptosis. The conservation of this alternative execution pathway was further examined in other tumor cell lines. Here, cathepsin B acted as an essential downstream mediator of TNF-triggered and caspase-initiated apoptosis cascade, whereas apoptosis of primary cells was only minimally dependent on cathepsin B. These data imply that cathepsin B, which is commonly overexpressed in human primary tumors, may have two opposing roles in malignancy, reducing it by its proapoptotic features and enhancing it by its known facilitation of invasion.

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