Abstract
JWA (Arl6ip5), a homologous gene of glutamate-transporter-associated protein 3-18 (GTRAP3-18) and addicsin, is highly expressed in hippocampus. We generated systemic and neuronal JWA knockout (JWA-KO and JWA-nKO) mice to investigate the influence of JWA deficiency on spatial cognitive performance, process of neurogenesis, and induction of long-term potentiation (LTP) in hippocampal dentate gyrus (DG). In comparison with wild-type (WT) mice and JWA loxP/loxP (control of JWA-nKO) mice, 8-week-old JWA-KO mice and JWA-nKO mice showed spatial cognitive potentiation as assessed by Morris water maze test. In hippocampal DG of JWA-nKO mice, either survival and migration or neurite growth of newborn neurons were significantly enhanced without the changes in proliferation and differentiation of stem cells. In addition, the increase of LTP amplitude and the decline of LTP threshold were observed in DG, but not in CA1 region, of JWA-nKO mice compared to control mice. The levels of hippocampal FAK, Akt, and mTOR phosphorylation in JWA-nKO mice were higher than those in control mice. The PI3K or FAK inhibitor could abolish the enhanced neurogenesis and LTP induction in JWA-nKO mice, which was accompanied by disappearance of the spatial cognitive potentiation. The treatment of JWA-nKO mice with 3′-azido-3′-deoxythymidine (AZT), a telomerase inhibitor, suppressed not only the enhanced neurogenesis but also the enhanced LTP induction in DG, but it did not affect the LTP induction in CA1 region. The results suggest that the JWA deficiency through cascading FAK-PI3K-Akt-mTOR pathway increases the newborn neurons and enhances the LTP induction in hippocampal DG, which leads to the spatial cognitive potentiation.
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Acknowledgments
This work was supported by grants for National 973 Basic Research Program of China (grant no. 2014CB943303), National Nature Science Foundation of China (grant nos. 81071027, 31171440 and 81361120247) to Chen L, National Nature Science Foundation of China (grant nos. 30930080 and 91229125) to Zhou JW.
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We declare that there is no competing financial interest that could be construed as influencing the results or interpretation of the reported study.
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Sha, S., Xu, J., Lu, ZH. et al. Lack of JWA Enhances Neurogenesis and Long-Term Potentiation in Hippocampal Dentate Gyrus Leading to Spatial Cognitive Potentiation. Mol Neurobiol 53, 355–368 (2016). https://doi.org/10.1007/s12035-014-9010-4
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DOI: https://doi.org/10.1007/s12035-014-9010-4