Overexpression of minichromosome maintenance protein 10 in medulloblastoma and its clinical implications

Background Overexpression of minichromosome maintenance (MCM) proteins 2, 3, and 7 is associated with migration and invasion in medulloblastoma (MB). However, expression profiling of all prereplication complex (pre‐RC) has not been addressed in MBs. Procedure We performed mRNA expression profiling of a large set of pre‐RC elements in cell lines and tumor tissues of MB. RNAi technology was employed for functional studies in MB cell lines. Results Our data showed that most of the pre‐RC components are significantly overexpressed in MB. Among all pre‐RC mRNAs, MCM10 showed the highest level of expression (∼500‐ to 1,000‐fold) in MB cell lines and tissues compared to the levels detected in cerebellum. In addition, RNAi silencing of MCM10 caused reduced cell proliferation and cell viability in MB cells. Conclusions Taken together, our study reveals that the pre‐RC is dysregulated in MB. In addition, MCM10, a member of this complex, is significantly overexpressed in MB and is required for tumor cell proliferation.