The miR-34 family in cancer and apoptosis
- PMID: 19461653
- DOI: 10.1038/cdd.2009.56
The miR-34 family in cancer and apoptosis
Abstract
Recently, the transcription factor encoded by tumor suppressor gene p53 was shown to regulate the expression of microRNAs. The most significant induction by p53 was observed for the microRNAs miR-34a and miR-34b/c, which turned out to be direct p53 target genes. Ectopic miR-34 expression induces apoptosis, cell-cycle arrest or senescence. In many tumor types the promoters of the miR-34a and the miR-34b/c genes are subject to inactivation by CpG methylation. MiR-34a resides on 1p36 and is commonly deleted in neuroblastomas. Furthermore, the loss of miR-34 expression has been linked to resistance against apoptosis induced by p53 activating agents used in chemotherapy. In this review, the evidence for a role of miR-34a and miR-34b/c in the apoptotic response of normal and tumor cells is surveyed.
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