Abstract:
:mTOR senses nutrient and energy status to regulate cell survival and metabolism in response to environmental changes. Surprisingly, targeted mutation of Tsc1, a negative regulator of mTORC1, caused a broad reduction in miRNAs due to Drosha degradation. Conversely, targeted mutation of Raptor, an essential component of mTORC1, increased miRNA biogenesis. mTOR activation increased expression of Mdm2, which is hereby identified as the necessary and sufficient ubiquitin E3 ligase for Drosha. Drosha was induced by nutrient and energy deprivation and conferred resistance to glucose deprivation. Using a high-throughput screen of a miRNA library, we identified four miRNAs that were necessary and sufficient to protect cells against glucose-deprivation-induced apoptosis. These miRNA was regulated by glucose through the mTORC1-MDM2-DROSHA axis. Taken together, our data reveal an mTOR-Mdm2-Drosha pathway in mammalian cells that broadly regulates miRNA biogenesis as a response to alteration in cellular environment.
journal_name
Mol Celljournal_title
Molecular cellauthors
Ye P,Liu Y,Chen C,Tang F,Wu Q,Wang X,Liu CG,Liu X,Liu R,Liu Y,Zheng Pdoi
10.1016/j.molcel.2014.12.034subject
Has Abstractpub_date
2015-02-19 00:00:00pages
708-720issue
4eissn
1097-2765issn
1097-4164pii
S1097-2765(14)01012-0journal_volume
57pub_type
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