Proteomic comparison of oligodendrogliomas with and without 1pLOH

Hiroaki Okamoto, Jie Li, Sven Gläsker, Alexander O. Vortmeyer, Howard Jaffe, R. Aaron Robison, Oliver Bogler, Tom Mikkelsen, Irina A. Lubensky, Edward H. Oldfield, Zhengping Zhuang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Objective: Chemoresistance is a widespread therapeutic challenge in glial tumors. The molecular basis of chemoresistance is poorly understood, precluding advances in glioma treatment and leaving gliomas among the most lethal tumors. Oligodendrogliomas provide a unique model to study the molecular basis of chemoresistance, as there are two distinct genetic subtypes with significant differences in chemosensitivity. Despite a high morphological similarity, tumors with allelic loss on the short arm of chromosome 1 (1pLOH) are more chemosensitive than those without 1pLOH. Methods: In order to identify candidate proteins potentially responsible for glioma chemosensitivity, we compared the proteome of four oligodendrogliomas with and five without 1pLOH using comparative proteomic profiling. Proteomic analysis was performed by two-dimensional protein gel electrophoresis and subsequent computerized gel analysis for detection of distinguishing patterns of protein expression. Differentially expressed proteins were identified using Liquid Chromatography/Mass Spectrometry. Differential expression of select proteins was confirmed by Western blotting. Results: We identified seven candidate proteins that are overexpressed in oligodendrogliomas without 1pLOH. Two of these proteins (glyoxalase I and Rho GDP dissociation inhibitor) have previously been shown to enhance chemoresistance in other tumors. In turn, we identified twelve overexpressed proteins in tumors with 1pLOH that have previously been reported to induce chemosensitivity in other forms of human neoplasia. Conclusions: These identified proteins are potential targets for pharmacological therapy and may also be useful as biomarkers for differentiation of chemoresistant and chemosensitive oligodendroglioma.

Original languageEnglish (US)
Pages (from-to)391-396
Number of pages6
JournalCancer Biology and Therapy
Issue number3
StatePublished - Mar 2007

ASJC Scopus subject areas

  • Molecular Medicine
  • Oncology
  • Pharmacology
  • Cancer Research

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