Abstract
Axonal maturation and myelination are essential processes for establishing an efficient neuronal signaling network. We found that nardilysin (N-arginine dibasic convertase, also known as Nrd1 and NRDc), a metalloendopeptidase enhancer of protein ectodomain shedding, is a critical regulator of these processes. Nrd1−/− mice had smaller brains and a thin cerebral cortex, in which there were less myelinated fibers with thinner myelin sheaths and smaller axon diameters. We also found hypomyelination in the peripheral nervous system (PNS) of Nrd1−/− mice. Neuron-specific overexpression of NRDc induced hypermyelination, indicating that the level of neuronal NRDc regulates myelin thickness. Consistent with these findings, Nrd1−/− mice had impaired motor activities and cognitive deficits. Furthermore, NRDc enhanced ectodomain shedding of neuregulin1 (NRG1), which is a master regulator of myelination in the PNS. On the basis of these data, we propose that NRDc regulates axonal maturation and myelination in the CNS and PNS, in part, through the modulation of NRG1 shedding.
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Acknowledgements
We are grateful to N. Nishimoto and H. Nakabayashi for technical assistance, and K. Matsumoto, E. Kimura, A. Kinoshita and A. Sehara for materials. We thank P.W. Park, T. Nishio, H. Fujiwara, T. Kaneko, F. Fujiyama and H. Kawasaki for critical reading of the manuscript. This study was supported by research grants (19041035, 20390255, 20659061, 20200068 and IBR-shien) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. It was also supported by the Takeda Science Foundation, the Mochida Memorial Foundation for Medical and Pharmaceutical Research, the Suzuken Memorial Foundation, the Japan Health Foundation and the Daiichi Sankyo Sponsored Research Program.
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M.O. and E.N. planned the experiments and wrote the manuscript. M.O., Y.H., T.M. and E.N. performed the experiments. H.T. carried out the histological procedures. K.T. and T.M. performed behavioral analysis. N.O. and H.K. generated the Nrd1−/− mice. T. Kimura and T. Kita supervised the work.
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Ohno, M., Hiraoka, Y., Matsuoka, T. et al. Nardilysin regulates axonal maturation and myelination in the central and peripheral nervous system. Nat Neurosci 12, 1506–1513 (2009). https://doi.org/10.1038/nn.2438
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DOI: https://doi.org/10.1038/nn.2438
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