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Hong, Jiayue; Garfolo, Rebekah; Kabre, Sejal; Humml, Christian; Velanac, Viktorija; Roué, Clémence; Beck, Brianna; Jeanette, Haley; Haslam, Sarah; Bach, Martin; Arora, Simar; Acheta, Jenica; Nave, Klaus‐Armin; Schwab, Markus H.; Jourd'heuil, David; Poitelon, Yannick; Belin, Sophie
Glia, 20/May , Letnik: 72, Številka: 5Journal Article
It is well established that axonal Neuregulin 1 type 3 (NRG1t3) regulates developmental myelin formation as well as EGR2‐dependent gene activation and lipid synthesis. However, in peripheral neuropathy disease context, elevated axonal NRG1t3 improves remyelination and myelin sheath thickness without increasing Egr2 expression or activity, and without affecting the transcriptional activity of canonical myelination genes. Surprisingly, Pmp2, encoding for a myelin fatty acid binding protein, is the only gene whose expression increases in Schwann cells following overexpression of axonal NRG1t3. Here, we demonstrate PMP2 expression is directly regulated by NRG1t3 active form, following proteolytic cleavage. Then, using a transgenic mouse model overexpressing axonal NRG1t3 (NRG1t3OE) and knocked out for PMP2, we demonstrate that PMP2 is required for NRG1t3‐mediated remyelination. We demonstrate that the sustained expression of Pmp2 in NRG1t3OE mice enhances the fatty acid uptake in sciatic nerve fibers and the mitochondrial ATP production in Schwann cells. In sum, our findings demonstrate that PMP2 is a direct downstream mediator of NRG1t3 and that the modulation of PMP2 downstream NRG1t3 activation has distinct effects on Schwann cell function during developmental myelination and remyelination. Main Point PMP2 is a downstream promyelinating mediator of NRG1t3‐mediated remyelination.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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