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BNIP3L/NIX-mediated mitophagy protects against glucocorticoid-induced synapse defects.


ABSTRACT: Stress-induced glucocorticoids disturb mitochondrial bioenergetics and dynamics; however, instead of being removed via mitophagy, the damaged mitochondria accumulate. Therefore, we investigate the role of glucocorticoids in mitophagy inhibition and subsequent synaptic defects in hippocampal neurons, SH-SY5Y cells, and ICR mice. First, we observe that glucocorticoids decrease both synaptic density and vesicle recycling due to suppressed mitophagy. Screening data reveal that glucocorticoids downregulate BNIP3-like (BNIP3L)/NIX, resulting in the reduced mitochondrial respiration function and synaptic density. Notably, we find that glucocorticoids direct the glucocorticoid receptor to bind directly to the PGC1? promoter, downregulating its expression and nuclear translocation. PGC1? downregulation selectively decreases NIX-dependent mitophagy. Consistent with these results, NIX enhancer pre-treatment of a corticosterone-exposed mouse elevates mitophagy and synaptic density in hippocampus, improving the outcome of a spatial memory task. In conclusion, glucocorticoids inhibit mitophagy via downregulating NIX and that NIX activation represents a potential target for restoring synapse function.

SUBMITTER: Choi GE 

PROVIDER: S-EPMC7817668 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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BNIP3L/NIX-mediated mitophagy protects against glucocorticoid-induced synapse defects.

Choi Gee Euhn GE   Lee Hyun Jik HJ   Chae Chang Woo CW   Cho Ji Hyeon JH   Jung Young Hyun YH   Kim Jun Sung JS   Kim Seo Yihl SY   Lim Jae Ryong JR   Han Ho Jae HJ  

Nature communications 20210120 1


Stress-induced glucocorticoids disturb mitochondrial bioenergetics and dynamics; however, instead of being removed via mitophagy, the damaged mitochondria accumulate. Therefore, we investigate the role of glucocorticoids in mitophagy inhibition and subsequent synaptic defects in hippocampal neurons, SH-SY5Y cells, and ICR mice. First, we observe that glucocorticoids decrease both synaptic density and vesicle recycling due to suppressed mitophagy. Screening data reveal that glucocorticoids downre  ...[more]

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