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- W2058546920 abstract "MicroRNAs of the miR-34/449 family mediate cell cycle arrest and tumor suppression. Here we show that the expression of microRNA miR-449a, unlike its paralogue miR-34a, is highly tissue specific and largely restricted to pulmonary and testicular tissue. MiR-449a levels in the murine lung are particularly high shortly before and after birth, coinciding with terminal differentiation of lung epithelia. Strikingly, miR-449a is upregulated by more than 1000-fold when epithelial cells from human airways are lifted from a liquid environment to air, allowing them to undergo mucociliary differentiation. The induction of miR-449a occurs in parallel to its host gene CDC20B and the transcription factor FoxJ1. Exposure to tobacco smoke induces a moderate further increase in the levels of miR-449a, and also miR-34a, in differentiated airway epithelia. We propose that miR-449a can serve as an exquisitely sensitive and specific biomarker for the differentiation of bronchial epithelia. Moreover, miR-449a may actively promote mucociliary differentiation through its ability to block cell cycle progression, and it may conribute to a first line of defence against genotoxic stress by its proapoptotic functions." @default.
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- W2058546920 date "2010-11-15" @default.
- W2058546920 modified "2023-09-23" @default.
- W2058546920 title "MicroRNA-449a levels increase by several orders of magnitude during mucociliary differentiation of airway epithelia" @default.
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- W2058546920 doi "https://doi.org/10.4161/cc.9.22.13870" @default.
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