Axl and growth arrest-specific gene 6 are frequently overexpressed in human gliomas and predict poor prognosis in patients with glioblastoma multiforme - PubMed (original) (raw)

. 2008 Jan 1;14(1):130-8.

doi: 10.1158/1078-0432.CCR-07-0862.

Pjotr Knyazev, Ariane Abate, Markus Reschke, Hans Maier, Nadia Stefanova, Tatjana Knyazeva, Verena Barbieri, Markus Reindl, Armin Muigg, Herwig Kostron, Guenther Stockhammer, Axel Ullrich

Affiliations

• PMID: 18172262
• DOI: 10.1158/1078-0432.CCR-07-0862

Axl and growth arrest-specific gene 6 are frequently overexpressed in human gliomas and predict poor prognosis in patients with glioblastoma multiforme

Markus Hutterer et al. Clin Cancer Res. 2008.

Abstract

Purpose: The receptor tyrosine kinase Axl has recently been identified as a critical element in the invasive properties of glioma cell lines. However, the effect of Axl and its ligand growth arrest--specific gene 6 (Gas6) in human gliomas is still unknown.

Experimental design: Axl and Gas6 expression was studied in 42 fresh-frozen and 79 paraffin-embedded glioma specimens by means of reverse transcription-PCR and immunohistochemistry. The prognostic value of Axl and Gas6 expression was evaluated using a population-based tissue microarray derived from a cohort of 55 glioblastoma multiforme (GBM) patients.

Results: Axl and Gas6 were detectable in gliomas of malignancy grades WHO 2 to 4. Moderate to high Axl mRNA expression was found in 61%, Axl protein in 55%, Gas6 mRNA in 81%, and Gas6 protein in 74% of GBM samples, respectively. GBM patients with high Axl expression and Axl/Gas6 coexpression showed a significantly shorter time to tumor progression and an association with poorer overall survival. Comparative immunohistochemical studies showed that Axl staining was most pronounced in glioma cells of pseudopalisades and reactive astrocytes. Additionally, Axl/Gas6 coexpression was observed in glioma cells and tumor vessels. In contrast, Axl staining was not detectable in nonneoplastic brain tissue and Gas6 was strongly expressed in neurons.

Conclusions: In human gliomas, Axl and Gas6 are frequently overexpressed in both glioma and vascular cells and predict poor prognosis in GBM patients. Our results indicate that specific targeting of the Axl/Gas6 signaling pathway may represent a potential new approach for glioma treatment.

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