Prolifération cellulaire et protéine HuR dans les méningiomes

Abstract : Introduction and objectives: Meningiomas are frequent and in most of cases low grade intracranial tumors, with frequent recurrences. The first objective of this study was to evaluate the prognostic value of proliferation and cell cycle markers in a series of 60 meningiomas. HuR (ELAV-like 1) is a pro-oncogenic protein that stimulates cell proliferation and survival. In the second part of this study, the objective was to evaluate HuR expression, and the effects of HuR inhibition on proliferation, apoptosis and resistance to hypoxia. Results: We found a significant correlation between histological grade and nuclear staining for MCM6 (p<0.001), Ki-67 (p<0.001) and PHH3 (p<0.001), and an inverse correlation between these markers and reccurence free survival (Cox; MCM6: p<0.001; Ki-67: p=0.003; PHH3: p=0.037). Cytoplasm staining for HuR was significantly stronger in atypical meningiomas (grades I vs II: p=0.0007), inversely correlated with progression free survival (p=0.028), and was positively correlated with mitotic index (p=0.0001), Ki-67 (p=0.0007) and MCM6 (p=0.0009). In vitro, HuR inhibition (siRNA) led to a significant decrease of cell growth (p=0.0004) and proliferation (Ki-67, p=0.0004), and an increase of apoptosis (cleaved caspase 3, p=0.002). These effects were significantly increased under hypoxia, comparing with normoxia. When HuR was inhibited, SIRT1 was decreased, both under normoxia (p=0.01) and hypoxia (p=0.0006). Conclusion: In conclusion, MCM6 is an efficient marker to identify meningiomas with high risk of recurrence. HuR is correlated with a poor prognosis. Its inhibition allows to decrease cell proliferation and to increase apoptosis
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Guillaume Gauchotte. Prolifération cellulaire et protéine HuR dans les méningiomes. Médecine humaine et pathologie. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0032⟩. ⟨tel-01750688⟩

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