Souza CCR, Dombroski TCD, Machado HR, Oliveira RS, Rocha LB, Rodrigues ARA, Neder L, Chimelli L, Corrêa VMA, Larson RE, Martins AR. Myosin Va is developmentally regulated and expressed in the human cerebellum from birth to old age.
Braz J Med Biol Res 2015;
46:164-70. [PMID:
23558932 PMCID:
PMC3854355 DOI:
10.1590/1414-431x20122627]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 12/03/2012] [Indexed: 12/04/2022] Open
Abstract
Myosin Va functions as a processive, actin-based motor molecule highly enriched
in the nervous system, which transports and/or tethers organelles, vesicles, and
mRNA and protein translation machinery. Mutation of myosin Va leads to Griscelli
disease that is associated with severe neurological deficits and a short life
span. Despite playing a critical role in development, the expression of myosin
Va in the central nervous system throughout the human life span has not been
reported. To address this issue, the cerebellar expression of myosin Va from
newborns to elderly humans was studied by immunohistochemistry using an
affinity-purified anti-myosin Va antibody. Myosin Va was expressed at all ages
from the 10th postnatal day to the 98th year of life, in molecular, Purkinje and
granular cerebellar layers. Cerebellar myosin Va expression did not differ
essentially in localization or intensity from childhood to old age, except
during the postnatal developmental period. Structures resembling granules and
climbing fibers in Purkinje cells were deeply stained. In dentate neurons, long
processes were deeply stained by anti-myosin Va, as were punctate nuclear
structures. During the first postnatal year, myosin Va was differentially
expressed in the external granular layer (EGL). In the EGL, proliferating
prospective granule cells were not stained by anti-myosin Va antibody. In
contrast, premigratory granule cells in the EGL stained moderately. Granule
cells exhibiting a migratory profile in the molecular layer were also moderately
stained. In conclusion, neuronal myosin Va is developmentally regulated, and
appears to be required for cerebellar function from early postnatal life to
senescence.
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