The extracellular matrix protein fibronectin is a substrate for kallikrein 7.

Abstract:

:Kallikrein 7 (hK7), a chymostatin-like serine protease, is overexpressed in pancreatic adenocarcinomas as well as other human cancers. Although it has been demonstrated to participate in normal desquamation by facilitating cell shedding at the skin surface, its role in human malignancies remains unclear. To investigate the ability of hK7 to degrade components of the extracellular matrix (ECM), recombinant hK7 was expressed and purified from cultured mammalian cells. Using a three-step chromatographic purification procedure, recombinant hK7 was obtained that displayed robust proteolytic activity against a fluorogenic peptide substrate following activation by thermolysin. We demonstrate that the active protease is able to cleave fibronectin in a time-dependent manner, but not laminin, using an in vitro degradation assay. These findings indicate that the aberrant expression and secretion of hK7 in human tumors may facilitate metastasis by directly degrading components of the extracellular matrix and may thus play an important role in tumorigenesis.

authors

Ramani VC,Haun RS

doi

10.1016/j.bbrc.2008.03.021

subject

Has Abstract

pub_date

2008-05-16 00:00:00

pages

1169-73

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(08)00471-3

journal_volume

369

pub_type

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