Abstract:
:Murine SCC-VII squamous carcinoma cells have the capacity to penetrate reconstituted basement membranes (Matrigel) in vitro. The invasion of Matrigel layers by SCC-VII cells was significantly reduced by E-64, a specific inhibitor of lysosomal cysteine proteinases. The cathepsin-B-selective E-64 derivative, CA-074, inhibited penetration of Matrigel by SCC-VII cells to the same extent, indicating a major role for this particular lysosomal enzyme in extracellular-matrix degradation during squamous-carcinoma-cell invasion. SCC-VII cells were stably transfected with a cDNA encoding human procathepsin B, in an attempt to modulate the invasive properties of the cell line. The transfected cells expressed the heterologous gene, secreted increased amounts of procathepsin B and displayed enhanced invasive potential. In vivo, the activity of cathepsin B is strictly regulated by endogenous inhibitors. SCC-VII cells were therefore also stably transfected with a cDNA encoding human cystatin C, the most potent cysteine-proteinase inhibitor in mammalian tissues. The expression of this transgene resulted in the production of active recombinant cystatin C and a pronounced reduction in Matrigel invasion. These studies demonstrate that the invasive properties of squamous-cell carcinomas can be changed by modulation of the balance between cathepsin B and its endogenous inhibitors, and provide further evidence for the involvement of this lysosomal cysteine proteinase in tumour invasion and metastasis.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Coulibaly S,Schwihla H,Abrahamson M,Albini A,Cerni C,Clark JL,Ng KM,Katunuma N,Schlappack O,Glössl J,Mach Ldoi
10.1002/(sici)1097-0215(19991112)83:4<526::aid-ijckeywords:
subject
Has Abstractpub_date
1999-11-12 00:00:00pages
526-31issue
4eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19991112)83:4<526::AID-IJCjournal_volume
83pub_type
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