Analyses of the role of endogenous SPARC in mouse models of prostate and breast cancer.

Abstract:

:Secreted protein, acidic and rich in cysteine (SPARC, also known as osteonectin or BM-40) is a glycoprotein component of the extracellular matrix that has been reported to be involved with a variety of cellular processes. Although SPARC expression levels are frequently altered in a variety of tumor types, the exact implications of deregulated SPARC expression--whether it promotes, inhibits or has no effect on tumor progression--have remained unclear. Our recent gene expression analyses have shown that SPARC is significantly downregulated in highly metastatic human prostate cancer cells. To test the role of endogenous SPARC in tumorigenesis directly, we examined cancer progression and metastasis in SPARC(+/-) and SPARC(-/-) mice using two separate transgenic mouse tumor models: transgenic adenocarcinoma of the mouse prostate (TRAMP) and murine mammary tumor virus-polyoma middle T (MMTV-PyMT). Surprisingly, in both instances, we found that loss of SPARC had no significant effects on tumor initiation, progression or metastasis. Tumor angiogenesis and collagen deposition were also largely unaffected. Our results indicate that, although differential SPARC expression may be a useful marker of aggressive, metastasis-prone tumors, loss of SPARC is not sufficient either to promote or to inhibit cancer progression in two spontaneous mouse tumor models.

journal_name

Clin Exp Metastasis

authors

Wong SY,Crowley D,Bronson RT,Hynes RO

doi

10.1007/s10585-007-9126-2

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

109-18

issue

2

eissn

0262-0898

issn

1573-7276

journal_volume

25

pub_type

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