Regulatory roles of miR-22/Redd1-mediated mitochondrial ROS and cellular autophagy in ionizing radiation-induced BMSC injury.

Abstract:

:Ionizing radiation (IR) response has been extensively investigated in BMSCs with an increasing consensus that this type of cells showed relative radiosensitivity in vitro analysis. However, the underlying mechanism of IR-induced injury of BMSCs has not been elucidated. In current study, the regulatory role of miR-22/Redd1 pathway-mediated mitochondrial reactive oxygen species (ROS) and cellular autophagy in IR-induced apoptosis of BMSCs was determined. IR facilitated the generation and accumulation of mitochondrial ROS, which promoted IR-induced apoptosis in BMSCs; meanwhile, cellular autophagy activated by IR hold a prohibitive role on the apoptosis program. The expression of miR-22 significantly increased in BMSCs after IR exposure within 24 h. Overexpression of miR-22 evidently accelerated IR-induced accumulation of mitochondrial ROS, whereas attenuated IR stimulated cellular autophagy, thus advancing cellular apoptosis. Furthermore, we verified Redd1 as a novel target for miR-22 in rat genome. Redd1 overexpression attenuated the regulatory role of miR-22 on mitochondrial ROS generation and alleviated the inhibitive role of miR-22 on cell autophagy activated by IR, thus protecting BMSCs from miR-22-mediated cell injury induced by IR exposure. These results confirmed the role of miR-22/Redd1 pathway in the regulation of IR-induced mitochondrial ROS and cellular autophagy, and subsequent cellular apoptosis.

journal_name

Cell Death Dis

journal_title

Cell death & disease

authors

Liu Z,Li T,Zhu F,Deng S,Li X,He Y

doi

10.1038/s41419-019-1373-z

subject

Has Abstract

pub_date

2019-03-07 00:00:00

pages

227

issue

3

issn

2041-4889

pii

10.1038/s41419-019-1373-z

journal_volume

10

pub_type

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