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High thioredoxin reductase 1 expression in meningiomas undergoing malignant progression
Hasan Esen1, Bahadır Feyzioglu, Fatih Erdi
1Department of Pathology, Meram Faculty of Medicine, Necmettin Erbakan University, Akyokus/Meram, 42080, Konya, Turkey, drhasanesen@gmail.com.
Brain Tumor Pathology
|January 17, 2015
Summary
Thioredoxin reductase 1 (TrxR1) expression increases with meningioma grade, suggesting its role in tumor progression. Apoptosis was not significantly affected, but proliferation markers rose with tumor malignancy.
Area of Science:
- Neuro-oncology
- Molecular biology
- Biochemistry
Background:
- Thioredoxin (Trx) is a key redox protein regulating cellular functions.
- Thioredoxin reductase (TrxR) modulates Trx activity.
- Meningiomas are tumors arising from the meninges, with varying grades of malignancy.
Purpose of the Study:
- To investigate the expression of thioredoxin reductase 1 (TrxR1) in meningioma tissues.
- To correlate TrxR1 expression with World Health Organization (WHO) grades of meningioma.
- To assess the relationship between TrxR1, proliferation, and apoptosis in meningiomas.
Main Methods:
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) for TrxR1 mRNA expression.
- Immunohistochemistry for TrxR1 protein expression.
- Ki-67 immunostaining for proliferation index.
- TUNEL assay for apoptotic index.
Main Results:
- TrxR1 expression significantly increased with higher meningioma grades (WHO I-III) by both qRT-PCR and immunostaining (p < 0.001).
- Ki-67 proliferation index also significantly increased with tumor grade (p < 0.001).
- No significant differences in apoptotic index were observed across meningioma grades (p > 0.05).
Conclusions:
- The thioredoxin system, particularly TrxR1, appears to be involved in the malignant progression of meningiomas.
- Increased TrxR1 expression correlates with higher tumor grade and proliferation.
- Further research is needed to fully elucidate the role of the Trx system in meningioma pathogenesis.
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