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Atherosclerosis I: Introduction01:30

Atherosclerosis I: Introduction

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Atherosclerosis is a progressive disorder characterized by the buildup of plaques on the arterial inner wall, causing them to narrow and harden over time. These plaques comprise lipids, calcium, blood components, carbohydrates, and fibrous tissue. The process primarily affects the intima of large and medium-sized arteries, reducing blood flow in any artery.Etiology and risk factorsThe cause of atherosclerosis is multifactorial, involving a complex interplay among endothelial injury, lipid...
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Antihypertensive Drugs: Vasodilators01:23

Antihypertensive Drugs: Vasodilators

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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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GPCRs Regulate Adenylyl Cylase Activity01:09

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Video Experimental Relacionado

Updated: Jan 18, 2026

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro
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Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro

Published on: February 15, 2022

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Activación de la variante PRKG1 mejora la deformabilidad de las células del músculo liso para causar aortopatía

Marie E Jost1, Moyra Schweizer1, Philipp Henning2

  • 1Department of Experimental Pharmacology and Toxicology, Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Center for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

JACC. Basic to translational science
|January 16, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Las variantes genéticas raras en PRKG1 pueden causar disección aórtica al aumentar la elasticidad del tejido. La variante V219I en las células del músculo liso vascular conduce a células más grandes y deformables y a una integridad estructural debilitada, lo que explica la predisposición a esta afección.

Palabras clave:
citoesqueleto de actinaunión a cGMPGMP cíclico quinasa dependientedeformabilidadaortopatía hereditariaactividad quinasavariantes de significado desconocido

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Área de la Ciencia:

  • Biología Cardiovascular
  • Genética
  • Medicina Molecular

Sus antecedentes:

  • La disección aórtica a menudo está relacionada con el envejecimiento y la hipertensión.
  • Las variantes genéticas raras están emergiendo como factores críticos en la enfermedad aórtica.
  • El gen PRKG1 juega un papel en la función de las células del músculo liso vascular.

Objetivo del estudio:

  • Investigar el papel de la variante genética PRKG1 V219I en la disección aórtica.
  • Elucidar los mecanismos moleculares por los cuales las variantes de PRKG1 predisponen a los individuos a aneurismas y disecciones aórticas.
  • Comprender los cambios celulares y estructurales inducidos por la variante PRKG1 V219I.

Principales métodos:

  • Análisis de pacientes con aneurismas aórticos y la variante PRKG1 V219I.
  • Estudios in vitro utilizando células de músculo liso vascular que expresan la variante V219I.
  • Evaluación del tamaño celular, la deformabilidad, la dinámica del citoesqueleto de actina y la señalización de la matriz extracelular.

Principales resultados:

  • Las células del músculo liso vascular con la variante V219I eran más grandes y más deformables.
  • Se observaron dinámicas aberrantes del citoesqueleto de actina y señalización alterada de la matriz extracelular.
  • Estos cambios resultaron en una integridad estructural debilitada y una mayor elasticidad del tejido.

Conclusiones:

  • La variante PRKG1 V219I causa alteraciones significativas en las propiedades de las células del músculo liso vascular.
  • La mayor elasticidad del tejido debido a las variantes de PRKG1 es un mecanismo patogénico clave para la disección aórtica.
  • Este estudio proporciona un modelo mecanicista para la enfermedad aórtica asociada a PRKG1.