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MicroRNA-7 regulates the mTOR pathway and proliferation in adult pancreatic ?-cells.


ABSTRACT: Elucidating the mechanism underlying the poor proliferative capacity of adult pancreatic ?-cells is critical to regenerative therapeutic approaches for diabetes. Here, we show that the microRNA (miR)-7/7ab family member miR-7a is enriched in mouse adult pancreatic islets compared with miR-7b. Remarkably, miR-7a targets five components of the mTOR signaling pathway. Further, inhibition of miR-7a activates mTOR signaling and promotes adult ?-cell replication in mouse primary islets, which can be reversed by the treatment with a well-known mTOR inhibitor, rapamycin. These data suggest that miR-7 acts as a brake on adult ?-cell proliferation. Most importantly, this miR-7-mTOR proliferation axis is conserved in primary human ?-cells, implicating miR-7 as a therapeutic target for diabetes.

SUBMITTER: Wang Y 

PROVIDER: S-EPMC3581216 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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MicroRNA-7 regulates the mTOR pathway and proliferation in adult pancreatic β-cells.

Wang You Y   Liu Jiangying J   Liu Chengyang C   Naji Ali A   Stoffers Doris A DA  

Diabetes 20121206 3


Elucidating the mechanism underlying the poor proliferative capacity of adult pancreatic β-cells is critical to regenerative therapeutic approaches for diabetes. Here, we show that the microRNA (miR)-7/7ab family member miR-7a is enriched in mouse adult pancreatic islets compared with miR-7b. Remarkably, miR-7a targets five components of the mTOR signaling pathway. Further, inhibition of miR-7a activates mTOR signaling and promotes adult β-cell replication in mouse primary islets, which can be r  ...[more]

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