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Amplification and Overexpression of mdm2 Gene in Ependymomas

机译:室管膜瘤中mdm2基因的扩增和过表达

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Ependymomas rarely show p53 gene alteration, and the tumorigenic mechanism of ependymomas still remains to be elucidated. We investigated the amplification and overexpression of mdm2 gene, whose product (MDM2) is considered to be one of the major cellular regulators of p53-mediated growth control, in 26 specimens of ependymomas obtained from 20 patients. The majority of the ependymomatous samples (96%) showed at least focal immunopositivity for MDM2; however, only 8% of the samples were immunopositive for p53. mdm2 gene amplification was detected in 35% of the samples by differential polymerase chain reaction, all of which overexpressed MDM2. These results suggest that the amplification and/or overexpression of mdm2 may be one of the major molecular events occurring in the tumorigenesis of ependymomas.
机译:室管膜瘤很少显示p53基因改变,并且室管膜瘤的致瘤机制仍有待阐明。我们调查了mdm2基因的扩增和过表达,该基因的产物(MDM2)被认为是p53介导的生长控制的主要细胞调节剂之一,在从20例患者中获得的26个室管膜瘤样本中。大多数的室管膜上样品(96%)至少显示出对MDM2的局灶免疫阳性。但是,只有8%的样本对p53免疫阳性。通过差异聚合酶链反应在35%的样本中检测到mdm2基因扩增,所有这些样本均过表达MDM2。这些结果表明,mdm2的扩增和/或过表达可能是发生在室管膜瘤的主要分子事件之一。

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