p16(INK4a) translation suppressed by miR-24.
basic_science · Level V
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- Record sourced from PubMed, PMID 18365017.
- Also identified by DOI 10.1371/journal.pone.0001864 and PMC identifier PMC1142594.
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Abstract
BACKGROUND: Expression of the tumor suppressor p16(INK4a) increases during aging and replicative senescence. METHODOLOGY/PRINCIPAL FINDINGS: Here, we report that the microRNA miR-24 suppresses p16 expression in human diploid fibroblasts and cervical carcinoma cells. Increased p16 expression with replicative senescence was associated with decreased levels of miR-24, a microRNA that was predicted to associate with the p16 mRNA coding and 3'-untranslated regions. Ectopic miR-24 overexpression reduced p16 protein but not p16 mRNA levels. Conversely, introduction of antisense (AS)-miR-24 blocked miR-24 expression and markedly enhanced p16 protein levels, p16 translation, and the production of EGFP-p16 reporter bearing the miR-24 target recognition sites. CONCLUSIONS/SIGNIFICANCE: Together, our results suggest that miR-24 represses the initiation and elongation phases of p16 translation.