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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/65825

    Título
    Kv2.1 channels play opposing roles in regulating membrane potential, Ca 2+ channel function, and myogenic tone in arterial smooth muscle
    Autor
    O’Dwyer, Samantha C.
    Palacio, Stephanie
    Matsumoto, Collin
    Guarina, Laura
    Klug, Nicholas R.
    Tajada Esteban, SendoaAutoridad UVA
    Rosati, Barbara
    McKinnon, David
    Trimmer, James S.
    Santana, L. Fernando
    Año del Documento
    2020
    Documento Fuente
    Proc Natl Acad Sci U S A. 2020 Feb 18;117(7):3858-3866.
    Resumo
    The accepted role of the protein Kv2.1 in arterial smooth muscle cells is to form K+ channels in the sarcolemma. Opening of Kv2.1 channels causes membrane hyperpolarization, which decreases the activity of L-type CaV1.2 channels, lowering intracellular Ca2+ ([Ca2+]i) and causing smooth muscle relaxation. A limitation of this model is that it is based exclusively on data from male arterial myocytes. Here, we used a combination of electrophysiology as well as imaging approaches to investigate the role of Kv2.1 channels in male and female arterial myocytes. We confirmed that Kv2.1 plays a canonical conductive role but found it also has a structural role in arterial myocytes to enhance clustering of CaV1.2 channels. Less than 1% of Kv2.1 channels are conductive and induce membrane hyperpolarization. Paradoxically, by enhancing the structural clustering and probability of CaV1.2-CaV1.2 interactions within these clusters, Kv2.1 increases Ca2+ influx. These functional impacts of Kv2.1 depend on its level of expression, which varies with sex. In female myocytes, where expression of Kv2.1 protein is higher than in male myocytes, Kv2.1 has conductive and structural roles. Female myocytes have larger CaV1.2 clusters, larger [Ca2+]i, and larger myogenic tone than male myocytes. In contrast, in male myocytes, Kv2.1 channels regulate membrane potential but not CaV1.2 channel clustering. We propose a model in which Kv2.1 function varies with sex: in males, Kv2.1 channels control membrane potential but, in female myocytes, Kv2.1 plays dual electrical and CaV1.2 clustering roles. This contributes to sex-specific regulation of excitability, [Ca2+]i, and myogenic tone in arterial myocytes.
    ISSN
    0027-8424
    Revisión por pares
    SI
    DOI
    10.1073/pnas.1917879117
    Idioma
    spa
    URI
    https://uvadoc.uva.es/handle/10324/65825
    Tipo de versión
    info:eu-repo/semantics/draft
    Derechos
    openAccess
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    • DEP06 - Artículos de revista [352]
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