Linked Life Data

14578463

Source:http://linkedlifedata.com/resource/pubmed/id/14578463

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pubmed-article:14578463pubmed:abstractTextUsing gene array technology, we recently observed for the first time an up-regulation of laminin alpha4 chain in human gliomas. The data were validated by semiquantitative reverse transcription-PCR for RNA expression and immunohistochemistry for protein expression. Moreover, increase of the alpha4 chain-containing laminin-8 correlated with poor prognosis for patients with brain gliomas. Therefore, we hypothesized that inhibition of laminin-8 expression by a new generation of highly specific and stable antisense oligonucleotides (Morpholino) against chains of laminin-8 could slow or stop the spread of glioma and its recurrence and thus might be a promising approach for glioma therapy. We next sought to establish an in vitro model to test the feasibility of this approach and to optimize conditions for Morpholino treatment. To develop a model, we used human glioblastoma multiforme cell lines M059K and U-87MG cocultured with normal human brain microvascular endothelial cells (HBMVEC). Using Western blot analysis and immunohistochemistry, we confirmed that antisense treatment effectively blocked laminin-8 protein synthesis. Antisense oligonucleotides against both alpha4 and beta1 chains of laminin-8 were able to block significantly the invasion of cocultures through Matrigel. On average, the invasion was blocked by 62% in cocultures of U-87MG with HBMVEC and by 53% in cocultures of M059K with HBMVEC. The results show that laminin-8 may contribute to glioma progression and recurrence not only as part of the neovascularization process but also by directly increasing the invasive potential of tumor cells.lld:pubmed
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pubmed-article:14578463pubmed:articleTitleAntisense inhibition of laminin-8 expression reduces invasion of human gliomas in vitro.lld:pubmed
pubmed-article:14578463pubmed:affiliationMaxine Dunitz Neurosurgical Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA.lld:pubmed
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