Abstract
Our previous reports indicate that the electron transfer chain and FoF1-ATP synthase are functionally expressed in myelin sheath, performing an extra-mitochondrial oxidative phosphorylation (OXPHOS), which would provide energy to the nerve axon. This supports the idea that myelin plays a trophic role for the axon. Although the four ETC complexes and ATP synthase are considered exquisite mitochondrial proteins, they are found ectopically expressed in several membranous structures. This study was designed to understand when and how the mitochondrial OXPHOS machinery is embedded in myelin, following myelinogenesis in the rat, which starts at birth and continues until the first month of age. Rats were sacrificed at different time points (from day 5 to 90 post birth). Western blot, immunofluorescence microscopy, luminometric, and oximetric analyses show that the isolated myelin starts to show OXPHOS components around the 11th day after birth and increases proportionally to the rat age, becoming similar to those of adult rat around the 30-third day. Interestingly, WB data show the same temporal relationship between myelinogenesis and appearance of proteins involved in mitochondrial fusion and cellular trafficking. It may be speculated that the OXPHOS complexes may be transferred to the endoplasmic reticulum membrane (known to interact with mitochondria) and from there through the Golgi apparatus to the forming myelin membrane.
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Acknowledgements
This study was supported by a Grant from the “Fondazione Giuseppe Levi–Accademia Nazionale dei Lincei” for the research project entitled: “Produzione extra-mitocondriale di ATP in mielina: localizzazione dei complessi della catena respiratoria e possible ruolo nella degenerazione assonale in Sclerosi Multipla” and a Grant from the “Compagnia di San Paolo”-Neuroscience Program, for the research project entitled: “Energetic metabolism in myelinated axon: a new trophic role of myelin sheath”
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Ravera, S., Bartolucci, M., Garbati, P. et al. Evaluation of the Acquisition of the Aerobic Metabolic Capacity by Myelin, during its Development. Mol Neurobiol 53, 7048–7056 (2016). https://doi.org/10.1007/s12035-015-9575-6
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DOI: https://doi.org/10.1007/s12035-015-9575-6