Elevated levels of cathepsin B in human glioblastoma cell lines.

Abstract:

:Degradation of the extracellular matrix is a prerequisite for the invasive phenotype in glioma cells. Several proteases released by invading tumor cells seem to participate in the focal degradation of extracellular matrix proteins. Using enzymatic assays, Western blotting, and Northern blotting techniques, we investigated whether cathepsin B level was associated with malignant grade in seven human glioma cell lines. Cathepsin B activity and protein content levels were higher in glioblastoma cell lines than in anaplastic astrocytoma or low-grade glioma cell lines. Cathepsin B transcripts were overexpressed in glioblastoma cell lines relative to their expression in anaplastic astrocytoma and low-grade glioma cell lines. Cathepsin B promoter activity and amount of SP-1 complexes were much higher in glioblastoma cell lines than in anaplastic astrocytoma or low-grade glioma cell lines. Finally, E-64, an inhibitor of cathepsin B, inhibited both cathepsin B enzymatic activity and the invasiveness of glioblastoma cell lines. These results strongly support a role for cathepsin B in glioblastoma cell lines and suggest that inhibition of cathepsin B activity may be proven useful in cancer therapy.

journal_name

Int J Oncol

authors

Konduri S,Lakka SS,Tasiou A,Yanamandra N,Gondi CS,Dinh DH,Olivero WC,Gujrati M,Rao JS

doi

10.3892/ijo.19.3.519

keywords:

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

519-24

issue

3

eissn

1019-6439

issn

1791-2423

journal_volume

19

pub_type

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