Video Experimental Relacionado
Updated: Jul 19, 2026

12:51
Murine Model of Hindlimb Ischemia
Published on: January 21, 2009
p66ShcA modula la respuesta del tejido a la isquemia de las extremidades posteriores
Germana Zaccagnini1, Fabio Martelli, Pasquale Fasanaro
1Laboratorio di Patologia Vascolare, Istituto Dermopatico dell'Immacolata-IRCCS, Rome, Italy.
Circulation
|June 3, 2004
Resumen
Los ratones que carecían de la proteína p66ShcA mostraron una reducción del daño tisular y la muerte celular después de la isquemia y la reperfusión. Esto sugiere que p66ShcA es clave en estas vías de lesión, ofreciendo un potencial objetivo terapéutico.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Fisiología Fisiología Fisiología.
Sus antecedentes:
- El estrés oxidativo es fundamental para la isquemia y la lesión por isquemia/reperfusión (I/R).
- Los ratones p66ShcA-null exhiben especies reactivas de oxígeno reducidas y una mayor resistencia a la muerte celular inducida por el estrés oxidativo.
Objetivo del estudio:
- Para investigar el papel de p66ShcA en el daño tisular después de la isquemia aguda y I / R.
- Para determinar si la deficiencia de p66ShcA altera la susceptibilidad a la lesión isquémica.
Principales métodos:
- Inducción de isquemia unilateral de las extremidades traseras e I/R en ratones p66ShcA de tipo salvaje y ratones sin p66ShcA.
- Evaluación de los niveles de perfusión sanguínea, daño tisular (densidad capilar, necrosis de la fibra muscular) y apoptosis.
- Análisis in vitro de células aisladas bajo condiciones isquémicas simuladas.
Principales resultados:
- Los ratones p66ShcA-null mostraron una disminución significativamente menor de la densidad capilar y la necrosis de la fibra muscular en comparación con el tipo salvaje.
- Se observaron niveles más bajos de células endoteliales apoptóticas y miofibras en ratones p66ShcA-nulo después de la isquemia.
- Las células de ratones p66ShcA-null demostraron resistencia a la apoptosis y reducción del estrés oxidativo in vitro.
Conclusiones:
- p66ShcA es crítico en las vías de muerte celular activadas por isquemia aguda e I/R.
- Dirigirse a p66ShcA presenta una estrategia terapéutica potencial para mitigar el daño del tejido isquémico.
Videos de Conceptos Relacionados
Regulation of Hematopoietic Stem Cells
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
Introduction to Hemostasis
Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
Vascular Spasm
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Extrinsic and Intrinsic Pathways of Hemostasis
Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...

