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Immunolocalization of myosin Va in the developing nervous system of embryonic chicks

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Abstract

Myosins are molecular motors associated with the actin cytoskeleton that participate in the mechanisms of cellular motility. During the development of the nervous system, migration of nerve cells to specific sites, extension of growth cones, and axonal transport are dramatic manifestations of cellular motility. We demonstrate, via immunoblots, the expression of myosin Va during early stages of embryonic development in chicks, extending from the blastocyst period to the beginning of the fetal period. The expression of myosin Va in specific regions and cellular structures of the nervous system during these early stages was determined by immunocytochemistry using a polyclonal antibody. Whole mounts of chick embryos at 24–30-h stages showed intense immunoreactivity of the neural tube in formation along its full extent. Cross-sections at these stages of development showed strong labeling in neuroepithelial cells at the basal and apical regions of the neural tube wall. Embryos at more advanced periods of development (48h and 72 h) showed distinctive immunolabeling of neuroepithelial cells, neuroblasts and their cytoplasmic extensions in the mantle layer of the stratified neural tube wall, and neuroblasts and their cytoplasmic extensions in the internal wall of the optic cup, as well as a striking labeling of cells in the apparent nuclei of cranial nerves and budding fibers. These immunolocalization studies indicate temporal and site-specific expression of myosin Va during chick embryo development, suggesting that myosin Va expression is related to recruitment for specific cellular tasks.

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Acknowledgements

We thank Domingus E. Pitta, Silvas Regina Andrade, José Eduardo Bozano, and Luis Carlos de Oliveira for expert technical assistance. Alexandre de Azevedo was a predoctoral student with financial support from the Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES).

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Authors and Affiliations

  1. Department of Morphology, Instituto de Biociências, Universidade Estadual Paulista, Distrito de Rubião Junior s/n, 18618-000, São Paulo, Botucatu, Brasil

    Alexandre Azevedo

  2. Department of Cellular and Molecular Biology, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil

    Roy E. Larson

  3. Department of Morphology, Estomatology and Physiology, Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil

    Laurelúcia O. Lunardi

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  1. Alexandre Azevedo
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  2. Laurelúcia O. Lunardi
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  3. Roy E. Larson
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Correspondence to Alexandre Azevedo.

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Grant sponsor: Fundação de Amparo à Pesquisa do Estado de São Paulo; grant number 99/3951-7 to R.E. Larson. Grant sponsor: Fundação para o Desenvolvimento da Universidade Estadual Paulista; grant number DFP-014 to A. de Azevedo

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Azevedo, A., Lunardi, L.O. & Larson, R.E. Immunolocalization of myosin Va in the developing nervous system of embryonic chicks. Anat Embryol 208, 395–402 (2004). https://doi.org/10.1007/s00429-004-0405-2

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