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Whole-mount Immunohistochemical Analysis for Embryonic Limb Skin Vasculature: a Model System to Study Vascular Branching Morphogenesis in Embryo
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Las semaforinas de clase 3 controlan la morfogénesis vascular inhibiendo la función de la integrina.

Guido Serini1, Donatella Valdembri, Sara Zanivan

  • 1Division of Molecular Angiogenesis, IRCC, Institute for Cancer Research and Treatment, and Department of Oncological Sciences, University of Torino School of Medicine, 10060 Candiolo, TO, Italy. guido.serini@ircc.it

Nature
|July 25, 2003
PubMed
Resumen
Este resumen es generado por máquina.

Las células endoteliales usan semaforinas 3 (SEMA3) para controlar la activación de la integrina, lo que permite la plasticidad vascular durante el desarrollo y la angiogénesis. Este hallazgo revela SEMA3 como un regulador clave de la adhesión celular y la migración en la formación de vasos sanguíneos.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología del desarrollo Biología del desarrollo.
  • Biología Vascular Biología Vascular

Sus antecedentes:

  • La motilidad y la morfogénesis de las células endoteliales son cruciales para la remodelación vascular, reguladas por los receptores de adhesión de la integrina.
  • La adhesión celular dinámica es necesaria para que las células endoteliales respondan a las señales de la matriz extracelular durante la angiogénesis.

Objetivo del estudio:

  • Investigar el papel de las semaforinas de clase 3 (SEMA3) en la regulación de la función de la integrina de las células endoteliales y el desarrollo vascular.
  • Para determinar si las células endoteliales producen señales autocrinas que modulan la adhesión y la migración mediadas por integrina.

Principales métodos:

  • Estudió las células endoteliales durante el desarrollo vascular y la angiogénesis experimental.
  • Investigó los efectos de la alteración de la función SEMA3 endógena y la aplicación de proteínas SEMA3 exógenas.
  • Uso de la expresión errónea dominante negativa del receptor SEMA3 en las células endoteliales del embrión de pollo.
  • Defectos vasculares examinados en ratones Sem3a nulos.

Principales resultados:

  • Las células endoteliales generan señales SEMA3 autocrinas que se localizan en sitios adhesivos.
  • La interrupción de la función SEMA3 mejora la adhesión y la migración mediadas por integrina.
  • Las proteínas SEMA3 exógenas inhiben la activación de la integrina.
  • El deterioro de la señalización SEMA3 conduce a integrinas hiperactivas y remodelación vascular defectuosa.

Conclusiones:

  • Las proteínas endotelial SEMA3 actúan como reguladores negativos de la activación de la integrina.
  • Las proteínas SEMA3 proporcionan plasticidad vascular mediante el control de la función de la integrina durante la angiogénesis.
  • Estos hallazgos resaltan la señalización SEMA3 como un mecanismo crítico para el desarrollo vascular y la remodelación.