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MMP-9 Short Interfering RNA Induced Senescence Resulting in Inhibition of Medulloblastoma Growth Via P16(INK4a) and Mitogen-activated Protein Kinase Pathway

Overview
Journal Cancer Res
Specialty Oncology
Date 2007 May 19
PMID 17510426
Citations 27
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Abstract

The involvement of matrix metalloproteinases (MMP) has been suggested in cellular mechanisms leading to medulloblastoma, the most common malignant brain tumor in children. A significant association of the expression levels of MMP-9 with survival and M stage suggests that patients with medulloblastoma metastatic disease at diagnosis may benefit from the anti-MMP therapy. Here, we have evaluated the tumorigenicity of medulloblastoma cells after infection with an adenovirus containing a 21-bp short interfering RNA sequence of the human MMP-9 gene (Ad-MMP-9). Infection of Daoy medulloblastoma cells with Ad-MMP-9 reduced MMP-9 activity and protein levels compared with parental and Ad-SV controls. Ad-MMP-9 decreased the number of viable Daoy cells in a concentration-dependent manner. Fluorescence-activated cell sorting analysis indicated that Ad-MMP-9 infection caused a dose-dependent cell cycle arrest in the G(0)-G(1) phase. Ad-MMP-9-induced cell cycle arrest seems to be mediated by the extracellular signal-regulated kinase/mitogen-activated protein kinase pathway and the cell cycle inhibitor p16(INK4a) and is phenotypically indistinguishable from senescence. Ad-MMP-9 treatment inhibited medulloblastoma tumor growth in an intracranial model and was mediated by up-regulation of p16 expression. These studies validate the usefulness of targeting MMP-9 and provide a novel perspective in the treatment of medulloblastoma.

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