The effect of thrombospondin-1 on breast cancer metastasis.

Abstract:

:Thrombospondin-1 (TSP-1) has been proposed to have both pro-metastatic and anti-metastatic properties. To elucidate its role in breast cancer metastasis, we compared tumor progression in the polyomavirus middle T antigen (Pyt) transgenic mouse and the TSP-1-null Pyt transgenic mouse. We characterized the tumors in these mice at 45, 60 and 90 days of age. Tumor size, areas of necrosis, macrophage infiltration, levels of active and total TGF-beta, vessel morphology, and lung and blood metastasis were measured in these mice. Mammary tumors were larger in the TSP-1-null mouse, and vessels were larger, but fewer in number in these tumors. The level of total TGF-beta was significantly higher in the Pyt tumors at 90 days of age. Importantly, significantly fewer metastases were observed in the lungs of the TSP-1-null/Pyt mouse. Primary Pyt tumor cells were more migratory than TSP-1-null Pyt tumor cells on collagen. Treatment of Pyt mice with recombinant proteins that contain the type-1 repeats of TSP-1 resulted in decreased primary tumor growth and metastasis. Sequences that are involved in CD36 binding and those required for TGF-beta activation mediated the inhibition of primary tumor growth. Thus, TSP-1 in the mammary tumor microenvironment inhibits angiogenesis and tumor growth, but promotes metastasis to the lung in the Pyt transgenic mouse. The ability of TSP-1 to support metastasis correlates with its ability to promote tumor cell migration.

authors

Yee KO,Connolly CM,Duquette M,Kazerounian S,Washington R,Lawler J

doi

10.1007/s10549-008-9992-6

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

85-96

issue

1

eissn

0167-6806

issn

1573-7217

journal_volume

114

pub_type

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