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Mitochondrial network reorganization and transient expansion during oligodendrocyte generation

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  • Xhoela Bame

    (Dartmouth College)

  • Robert A. Hill

    (Dartmouth College)

Abstract

Oligodendrocyte precursor cells (OPCs) give rise to myelinating oligodendrocytes of the brain. This process persists throughout life and is essential for recovery from neurodegeneration. To better understand the cellular checkpoints that occur during oligodendrogenesis, we determined the mitochondrial distribution and morphometrics across the oligodendrocyte lineage in mouse and human cerebral cortex. During oligodendrocyte generation, mitochondrial content expands concurrently with a change in subcellular partitioning towards the distal processes. These changes are followed by an abrupt loss of mitochondria in the oligodendrocyte processes and myelin, coinciding with sheath compaction. This reorganization and extensive expansion and depletion take 3 days. Oligodendrocyte mitochondria are stationary over days while OPC mitochondrial motility is modulated by animal arousal state within minutes. Aged OPCs also display decreased mitochondrial size, volume fraction, and motility. Thus, mitochondrial dynamics are linked to oligodendrocyte generation, dynamically modified by their local microenvironment, and altered in the aging brain.

Suggested Citation

  • Xhoela Bame & Robert A. Hill, 2024. "Mitochondrial network reorganization and transient expansion during oligodendrocyte generation," Nature Communications, Nature, vol. 15(1), pages 1-20, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51016-2
    DOI: 10.1038/s41467-024-51016-2
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    3. Stanislaw Mitew & Ilan Gobius & Laura R. Fenlon & Stuart J. McDougall & David Hawkes & Yao Lulu Xing & Helena Bujalka & Andrew L. Gundlach & Linda J. Richards & Trevor J. Kilpatrick & Tobias D. Merson, 2018. "Pharmacogenetic stimulation of neuronal activity increases myelination in an axon-specific manner," Nature Communications, Nature, vol. 9(1), pages 1-16, December.
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