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La dinamina-2 regula la apoptosis oxidada inducida por lipoproteínas de baja densidad de las células vasculares del

Yuji Kashiwakura¹, Masami Watanabe, Norihiro Kusumi

¹Department of Cardiology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. yu-kashi@med.juntendo.ac.jp

|November 17, 2004

Resumen

La dinamina-2 regula la apoptosis vascular de las células del músculo liso inducida por la lipoproteína oxidada de baja densidad (oxLDL) a través de la endocitosis y la vía p53. Esta proteína puede ser un objetivo terapéutico para enfermedades vasculares.

Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
Investigaciones Cardiovasculares Investigación Cardiovascular Investigaciones Cardiovasculares

Sus antecedentes:

La exposición a lipoproteínas oxidadas de baja densidad (oxLDL) induce la apoptosis de las células vasculares, un factor clave en la patogénesis de la aterosclerosis.
Las células del músculo liso vascular (VSMC) son cruciales en el desarrollo de placas ateroscleróticas.

Objetivo del estudio:

Para investigar el papel de la dinamina, una proteína GTPasa, en la apoptosis inducida por oxLDL de VSMC.
Para dilucidar las vías específicas a través de las cuales la dinamina influye en la apoptosis VSMC inducida por oxLDL.

Principales métodos:

Se utilizó el plásmido negativo dominante de dinamina-2 (K44A) para regular a la baja la expresión de dinamina-2.
Empleó la transfección del plásmido de dinamina-2 de tipo salvaje para estudiar sus efectos.
Inhibidor de la p53 pifithrin-alfa (PFT) administrado para evaluar la participación de la vía.
Examinó la expresión de dinamina-2 en placas ateroscleróticas de ratones con apolipoproteína E-/-.

Principales resultados:

La dinamina-2 se colocalizó con LOX-1 y oxLDL, lo que indica la participación en la endocitosis de oxLDL.
La regulación a la baja de la dinamina-2 redujo la absorción de oxLDL y la apoptosis VSMC.
La dinamina-2 de tipo salvaje aumentó la apoptosis inducida por oxLDL, en parte a través de la vía p53.
Los estudios in vivo mostraron una mayor expresión de dinamina-2 en el VSMC apoptótico dentro de las placas ateroscleróticas.

Conclusiones:

La dinamina-2 regula la apoptosis VSMC inducida por oxLDL a través de la endocitosis y la vía p53.
La dinamina-2 representa un objetivo terapéutico potencial para las enfermedades vasculares.
Se requiere más investigación sobre el papel de la dinamina-2 en la aterosclerosis.

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