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Expression of Unconventional Myosin VI in Oligodendrocytes.
Neurochemical Research 2017 December
Myelin is a specialized multilamellar structure involved in various functions of the nervous system. Oligodendrocytes are responsible for myelin formation in the central nervous system. Motor proteins play important roles in differentiation and myelin formation of the oligodendrocyte lineage. Recently, we revealed that one of the unconventional myosins, myosin ID (Myo1d), is expressed in mature oligodendrocytes and is required for myelin-like membrane formation in vitro. Previously, Cahoy et al. (J Neurosci 28:264-278, 2008) reported that another unconventional myosin VI (Myo6) is upregulated in transcriptome data of differentiated oligodendrocytes. However, it is uncertain whether Myo6 protein is present in oligodendrocytes. In this study, to analyze expression of Myo6 in oligodendrocytes, we performed immunofluorescence analysis on brains of adult normal and cuprizone-induced demyelination mice. Myo6 expression was detected in mature oligodendrocytes and oligodendrocyte progenitor cells in the cerebellum and corpus callosum. To compare temporal expression patterns of myosin superfamily members in vitro, double immunostainings using anti-Myo6, myosin Va (Myo5a), or Myo1d with each stage-specific oligodendrocyte marker antibody were performed. In cultured oligodendrocytes, although Myo1d was found only in mature oligodendrocytes, Myo6 and Myo5a signals were detected in all stages of differentiation, from oligodendrocyte progenitor cells to mature oligodendrocytes. Additionally, similar to Myo5a, Myo6-positive signals were confined to the cell body and processes. These results showed that Myo6 is one of the unconventional myosins in oligodendrocyte lineage cells, which could play a role in clathrin-related endocytosis.
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