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Kalinski, Ashley L; Kar, Amar N; Craver, John; Tosolini, Andrew P; Sleigh, James N; Lee, Seung Joon; Hawthorne, Alicia; Brito-Vargas, Paul; Miller-Randolph, Sharmina; Passino, Ryan; Shi, Liang; Wong, Victor S C; Picci, Cristina; Smith, Deanna S; Willis, Dianna E; Havton, Leif A; Schiavo, Giampietro; Giger, Roman J; Langley, Brett; Twiss, Jeffery L
The Journal of cell biology, 06/2019, Letnik: 218, Številka: 6Journal Article
Inhibition of histone deacetylase 6 (HDAC6) was shown to support axon growth on the nonpermissive substrates myelin-associated glycoprotein (MAG) and chondroitin sulfate proteoglycans (CSPGs). Though HDAC6 deacetylates α-tubulin, we find that another HDAC6 substrate contributes to this axon growth failure. HDAC6 is known to impact transport of mitochondria, and we show that mitochondria accumulate in distal axons after HDAC6 inhibition. Miro and Milton proteins link mitochondria to motor proteins for axon transport. Exposing neurons to MAG and CSPGs decreases acetylation of Miro1 on Lysine 105 (K105) and decreases axonal mitochondrial transport. HDAC6 inhibition increases acetylated Miro1 in axons, and acetyl-mimetic Miro1 K105Q prevents CSPG-dependent decreases in mitochondrial transport and axon growth. MAG- and CSPG-dependent deacetylation of Miro1 requires RhoA/ROCK activation and downstream intracellular Ca increase, and Miro1 K105Q prevents the decrease in axonal mitochondria seen with activated RhoA and elevated Ca These data point to HDAC6-dependent deacetylation of Miro1 as a mediator of axon growth inhibition through decreased mitochondrial transport.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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