Abstract：
:The ability of tumour cells to resist apoptosis-inducing signals by cytotoxic T cells may decide the success or failure of tumour elimination. An important effector of apoptosis is the CD95/CD95 ligand system (APO-1/Fas) that mediates perforin-independent cytotoxic T-cell killing of tumour cells. We propose a new strategy by which tumour cells can resist CD95-induced apoptosis. We identified matrix metalloproteinase-7, MMP-7 (Martilysin), as the first physiologically relevant protease that can specifically cleave CD95. MMP-7 is of unique importance because it is produced by the tumour cells themselves at early stages of tumour development. Microsequencing of the positions in CD95 cleaved by MMP-7 revealed two sites in the N-terminal extracellular domain of CD95, important for preligand assembly of CD95. MMP-7 cleavage of CD95 results in reduced CD95 surface expression and decreased CD95-mediated apoptosis sensitivity of tumour cells. Treatment of MMP-7-positive HT-29 tumour cells with MMP-7-antisense oligonucleotides led to an increase in CD95-mediated apoptosis sensitivity. Finally, specific cytotoxic T-cell killing was reduced in the presence of MMP-7. Thus, MMP-7 expression in tumour cells may contribute to an apoptosis-resistant phenotype, which ultimately promotes immune escape. This activity may account for the well-established role of MMP-7 in early tumour development.
journal_name
Oncogenejournal_title
Oncogeneauthors
Strand S,Vollmer P,van den Abeelen L,Gottfried D,Alla V,Heid H,Kuball J,Theobald M,Galle PR,Strand Ddoi
10.1038/sj.onc.1207387subject
Has Abstractpub_date
2004-04-29 00:00:00pages
3732-6issue
20eissn
0950-9232issn
1476-5594pii
1207387journal_volume
23pub_type
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