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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Updated: Feb 13, 2026

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Reconstrucción aórtica compleja utilizando troncos de elefante congelados de doble luz

Neel A Mansukhani1, Andre Y Son2, Eric B Pillado1

  • 1Division of Vascular Surgery, Northwestern University Feinberg School of Medicine and Northwestern Medicine, Chicago, IL.

Journal of vascular surgery cases and innovative techniques
|February 12, 2026
PubMed
Resumen

Una novedosa técnica híbrida de reconstrucción aórtica se utilizó para una disección aórtica crónica compleja tipo B. Esta reparación de tronco de elefante congelado de "doble luz" ofrece una solución viable para casos desafiantes del arco aórtico.

Palabras clave:
Disección aórticaTroncos de elefante congelados de doble luzTronco de elefante congeladoReconstrucción híbrida del arco

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Área de la Ciencia:

  • Cirugía Cardiovascular
  • Cirugía Vascular
  • Enfermedad Aórtica

Sus antecedentes:

  • La disección aórtica crónica tipo B presenta desafíos complejos, incluida la degeneración aneurismática y opciones endovasculares limitadas.
  • Un paciente de 60 años tenía una disección compleja con un gran desgarro de entrada, aneurisma del arco distal y un tabique calcificado, lo que complicaba el tratamiento.
  • Las reparaciones abiertas tradicionales presentaban altos riesgos debido a las comorbilidades y la anatomía del paciente.

Objetivo del estudio:

  • Describir una técnica de reconstrucción híbrida del arco para disección aórtica crónica compleja.
  • Presentar un enfoque novedoso utilizando troncos de elefante congelados de "doble luz" y reparación endovascular torácica de la aorta.
  • Evaluar la viabilidad de esta técnica híbrida en un escenario clínico desafiante.

Principales métodos:

  • Se realizó una reconstrucción híbrida del arco que involucraba troncos de elefante congelados de "doble luz".
  • Se extendió la reparación endovascular torácica de la aorta para abordar la disección distal.
  • La técnica tenía como objetivo manejar la anatomía compleja, incluido el tabique calcificado y el pseudoaneurisma.

Principales resultados:

  • El enfoque híbrido abordó con éxito la disección aórtica crónica compleja.
  • La técnica de tronco de elefante congelado de "doble luz" facilitó la reconstrucción del arco aórtico.
  • La técnica combinada permitió el manejo del pseudoaneurisma mientras se mantenía el flujo de la luz verdadera y falsa.

Conclusiones:

  • La reconstrucción híbrida del arco con troncos de elefante congelados de "doble luz" y TEVAR es una opción viable para disecciones aórticas crónicas complejas.
  • Esta técnica puede ser particularmente útil en pacientes seleccionados con anatomía desafiante donde los métodos convencionales son limitados.
  • Se requieren estudios adicionales para establecer la eficacia y seguridad a largo plazo de este enfoque híbrido.