Abstract
Malignant astrocytomas of World Health Organization (WHO) grade III or IV have a reduced median survival time, and possible pathways have been described for the progression of anaplastic astrocytomas and glioblastomas, but the molecular basis of malignant astrocytoma progression is still poorly understood. Microarray analysis provides the chance to accelerate studies by comparison of the expression of thousands of genes in these tumours and consequently identify targeting genes. We compared the transcriptional profile of 4,608 genes in tumours of 15 patients including 6 anaplastic astrocytomas (WHO grade III) and 9 glioblastomas (WHO grade IV) using microarray analysis. The microarray data were corroborated by real-time reverse transcription-polymerase chain reaction analysis of two selected genes. We identified 166 gene alterations with a fold change of 2 and higher whose mRNA levels differed (absolute value of the t statistic of 1.96) between the two malignant glioma groups. Further analyses confirmed same transcription directions for Olig2 and IL-13Rα2 in anaplastic astrocytomas as compared to glioblastomas. Microarray analyses with a close binary question reveal numerous interesting candidate genes, which need further histochemical testing after selection for confirmation. IL-13Rα2 and Olig2 have been identified and confirmed to be interesting candidate genes whose differential expression likely plays a role in malignant progression of astrocytomas.
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Acknowledgement
For these studies, the first author (OB) has been financed by the Kempkes Foundation Marburg, Germany. We like to thank Prof. Eilers and Prof. Neubauer and their co-workers very much for their intensive assistance, help and collaboration to finish these studies. Special thanks to Dr. Krause and his microarray facility.
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Dietmar Krex, Dresden, Germany
In the present study by Bozinov et al., microarray analysis was performed in six anaplastic astrocytomas and nine GBMs (WHO grade III and IV, respectively) to identify molecular markers associated with progression and further dedifferentiation in malignant gliomas. Although there are numerous published data about the molecular differences between low- and high-grade gliomas, only little is known about molecular markers that are involved in late-stage malignization of glial tumours. Microarray-based approaches are reasonable to screen for candidate genes, although specificity of these analyses is low while costs are high. The latter is also a reason why in most studies only small numbers of patients are studied. To validate the results, and to identify promising candidate genes, data can be pooled from various analyses. Therefore, there is a clear need for more array-based approaches. Of course, like in the present study, results additionally need to be confirmed by another experimental approach. Bozinov et al. have picked two interesting genes Olig2 and IL-13Rα2 that were confirmed to be up- and downregulated, respectively, in glioblastomas as compared to anaplastic astrocytomas. Particularly the downregulation of the IL-13Rα2 gene is challenging and needs confirmation in larger series, as it is in contrast to several preclinical and clinical studies and indicates that the IL-13 receptor might not be a perfect target for a molecular therapy in a pure glioblastoma population.
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Kaoru Kurisu, Hiroshima, Japan
The authors emphasized the usefulness of microarray analysis in the determination of affected genes. In addition, they pointed out new transcriptional networks which concern the up and downregulation of signaling pathways. This approach is very beneficial to pick up the affected genes, but after obtaining the results, we have to check the function of them as mentioned by the authors in the conclusion. On the point of treatment application of these results, Olig2 and IL-13Rα2 are very fascinating to develop new molecular targeting to control tumor growth, invasion and dissemination on so on. Of course, after initial treatment, neoplasm can get another function as tolerance against the first treatment drugs and molecules. Therefore, we have to identify the advanced stage function of these candidates. In our department, survival was identified as a good prognostic factor in astrocytic tumors (Cancer. 2003; 97(4):1077–83) and its intracellular expression pattern can indicate the prognosis of high-grade astrocytomas (J Neurooncol. 2007 Apr; 82(2):193–8). Therefore, expression pattern or intracellular localization of the candidate factors is very important to understand the biological behavior of them. I hope the authors will develop their integrated works on these affected genes and related factors to overcome the worst neoplasm of central nervous system, glioblastoma.
An erratum to this article can be found at http://dx.doi.org/10.1007/s10143-008-0125-9
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Bozinov, O., Köhler, S., Samans, B. et al. Candidate genes for the progression of malignant gliomas identified by microarray analysis. Neurosurg Rev 31, 83–90 (2008). https://doi.org/10.1007/s10143-007-0107-3
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DOI: https://doi.org/10.1007/s10143-007-0107-3