Expression of ADAMTS-8, a secreted protease with antiangiogenic properties, is downregulated in brain tumours.

Abstract:

:Angiogenesis and extracellular matrix degradation are key events in tumour progression, and factors regulating stromal-epithelial interactions and matrix composition are potential targets for the development of novel anti-invasive/antiangiogenic therapies. Here, we examine the expression of ADAMTS-8, a secreted protease with antiangiogenic properties, in brain tissues. Using quantitative RT-polymerase chain reaction (PCR), high, equivalent expression of ADAMTS-8 was found in normal whole brain, cerebral cortex, frontal lobe, cerebellum and meninges. ADAMTS-8 expression in 34 brain tumours (including 22 high-grade gliomas) and four glioma cell lines indicated at least two-fold reduction in mRNA compared to normal whole brain in all neoplastic tissues, and no detectable expression in 14 out of 34 (41%) tumours or four out of four (100%) cell lines. In contrast, differential expression of TSP1 and VEGF was seen in nine out of 15 (60%) and seven out of 13 (54%) tumours, with no relationship in the expression of these genes. Immunohistochemistry and Western analysis indicated downregulation of ADAMTS-8 protein in >77% tumours. Methylation-specific PCR analysis of ADAMTS-8 indicated promoter hypermethylation in one out of 24 brain tumours (a metastasis) and three out of four glioma cell lines suggesting an alternative mechanism of downregulation. These data suggest a role for ADAMTS-8 in brain tumorigenesis, warranting further investigation into its role in regulation of tumour angiogenesis and local invasion.

journal_name

Br J Cancer

authors

Dunn JR,Reed JE,du Plessis DG,Shaw EJ,Reeves P,Gee AL,Warnke P,Walker C

doi

10.1038/sj.bjc.6603006

subject

Has Abstract

pub_date

2006-04-24 00:00:00

pages

1186-93

issue

8

eissn

0007-0920

issn

1532-1827

pii

6603006

journal_volume

94

pub_type

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