The amount and proteolytic content of vesicles shed by human cancer cell lines correlates with their in vitro invasiveness.

Abstract:

:Cancer cells are known to shed extracellular membrane vesicles both in vitro and in vivo. To analyse their possible involvement in the metastatic behaviour of tumours, we measured the Matrigel invasion capability and amounts of vesicles shed by four human tumour cell lines (8701-BC, MCF-7, MDA-MB-231 and HT-1080), and by MCF-10A, an immortalised human breast cell line. The proteolytic activity content of vesicles was analysed by gelatin and casein zymographies. While MCF-10A cells do not release a measurable amount of vesicles, all tumour lines analysed, when cultured in presence of serum, shed vesicles rich in MMP-9. Other vesicle-associated proteinases include MMP-2 and uPA. Amounts and proteolytic activities of shed vesicles correlate with the in vitro invasiveness of cells. Since vesicles appear to promote the proteolytic cascade required for the localised degradation of the extracellular matrix, their shedding from cancer cells might represent an important feature of tumour progression.

journal_name

Anticancer Res

journal_title

Anticancer research

authors

Ginestra A,La Placa MD,Saladino F,Cassarà D,Nagase H,Vittorelli ML

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

3433-7

issue

5A

eissn

0250-7005

issn

1791-7530

journal_volume

18

pub_type

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