Cell Reports
Volume 29, Issue 10, 3 December 2019, Pages 3101-3117.e7
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Article
Developmental Cytoplasmic-to-Nuclear Translocation of RNA-Binding Protein HuR Is Required for Adult Neurogenesis

https://doi.org/10.1016/j.celrep.2019.10.127Get rights and content
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Highlights

  • Ablation of HuR in NSCs impairs adult but not embryonic neurogenesis

  • Nuclear translocation of HuR is required for adult neurogenesis

  • HuR regulates neurogenesis through modulating the FAK premRNA splicing switch

  • Inhibition of FAK activity rescues defective adult neurogenesis in HuR-deficient mice

Summary

Although adult neurogenesis recapitulates processes that occur during embryonic development, it exhibits distinct characteristics from the embryonic counterpart. However, the intrinsic mechanism underlying the differential regulation of neurogenesis between these two stages remains unclear. Herein, we show that the ablation of RNA-binding protein HuR in NSCs impairs adult but not embryonic neurogenesis. HuR is predominantly expressed in the cytoplasm of embryonic NSCs but translocates into the nucleus of adult NSCs. Transcriptomic analysis of HuR-deficient adult NSCs revealed that HuR primarily regulates alternative splicing of numerous premRNA transcripts, including focal adhesion kinase (FAK). HuR-deficient adult NSCs generate increased FAK mRNA isoforms with shorter 5′-UTRs, leading to enhanced FAK mRNA translation and hyperactivated FAK signaling, and inhibition of FAK ameliorates defective adult neurogenesis and impaired hippocampus-dependent learning in HuR-deficient mice. These findings provide mechanistic insights into the differential regulation of embryonic and adult neurogenesis through developmental cytoplasmic-to-nuclear translocation of HuR.

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