Abstract | OBJECTIVE:
Meningiomas are the second most common primary tumors of the central nervous system. Meningiomas at the cranial base pose technical challenges and result in increased morbidity. To investigate the molecular mechanisms of meningioma formation, the expression profiles of 12 000 genes from meningiomas and dural specimens were compared. METHODS:
Ribonucleic acid from 6 meningiomas (World Health Organization Grade I) and 4 dural specimens was profiled using U95A GeneChips (Affymetrix, Inc., Santa Clara, CA). Expression profiles of the 2 groups were compared using dChip and Data Mining Tool software packages (Affymetrix, Inc.) to identify differentially expressed genes. Down-regulation of a differentially expressed tumor suppressor gene, deleted in liver cancer 1 (DLC1), was verified by quantitative real-time reverse transcription-polymerase chain reaction and immunohistochemical staining. Function and methylation of DLC1 were assessed by ectopic expression in 5 primary cultures, demethylation assay using 5-aza-2'-deoxycytidine, and methylation-specific polymerase chain reaction in 4 meningioma samples. RESULTS: CONCLUSION: The results suggest that DLC1 may function as a tumor suppressor gene in meningiomas. Furthermore, DLC1 promoter methylation does not appear to be responsible for the decreased DLC1 expression in these tumors.
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Authors | Gerald R Hankins, Tsutomu Sasaki, Ann-Shung Lieu, Dwight Saulle, Kambiz Karimi, Jin Zhong Li, Gregory A Helm |
Journal | Neurosurgery
(Neurosurgery)
Vol. 63
Issue 4
Pg. 771-80; discussion 780-1
(Oct 2008)
ISSN: 1524-4040 [Electronic] United States |
PMID | 18981889
(Publication Type: Journal Article, Research Support, N.I.H., Extramural)
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Chemical References |
- DLC1 protein, human
- GTPase-Activating Proteins
- Tumor Suppressor Proteins
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Topics |
- Adenoviridae
(genetics)
- Adult
- Aged
- Aged, 80 and over
- Cell Proliferation
- DNA Methylation
(genetics)
- Down-Regulation
- Dura Mater
(metabolism)
- Female
- GTPase-Activating Proteins
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Gene Transfer Techniques
- Genetic Vectors
(genetics)
- Humans
- Male
- Meningioma
(genetics, metabolism)
- Middle Aged
- Promoter Regions, Genetic
(genetics)
- Tumor Suppressor Proteins
(genetics, metabolism)
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