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Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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Atherosclerosis I: Introduction01:30

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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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Atherosclerosis III: Management01:26

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Management of atherosclerosis involves an integrated strategy encompassing pharmacological treatment, surgical interventions, lifestyle changes, and nutrition therapy to address the multifactorial nature of the disease.Pharmacological TherapyA cornerstone of atherosclerosis management is the use of pharmacological agents. Statins, such as atorvastatin, are pivotal in inhibiting HMG-CoA reductase, an enzyme that catalyzes an initial step in cholesterol synthesis in the liver. This reduction in...
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Lipid-Lowering Drugs: Statins and Miscellaneous Agents01:20

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Hyperlipidemia, a medical condition often referred to as high cholesterol, is characterized by abnormally elevated levels of lipids in the bloodstream. When present in excess, these lipids, specifically cholesterol and triglycerides, can lead to serious health complications, often involving cardiovascular diseases. Illnesses like atherosclerosis, heart attacks, and pancreatitis have all been linked to untreated hyperlipidemia. This means controlling and regulating cholesterol and triglyceride...
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Atherosclerosis II: Clinical Manifestations and Diagnostic Tests01:27

Atherosclerosis II: Clinical Manifestations and Diagnostic Tests

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Atherosclerosis is a progressive disorder that leads to the thickening and narrowing of arterial walls due to plaque buildup. This condition can cause various symptoms depending on the arteries affected:Coronary Artery Disease (CAD): This condition affects the coronary arteries and may lead to chest pain (angina), shortness of breath (dyspnea), heart attacks, and other heart disease symptoms.Cerebrovascular Disease: This affects blood flow to the brain, causing transient ischemic attacks (TIAs)...
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Updated: Sep 9, 2025

Cholesterol Efflux Assay
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Efecto del colesterol en la aterosclerosis asociada al VIH: mecanismos y objetivos

Emily Lu1, Vignesh Chidambaram2, Amudha Kumar3

  • 1Division of Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA.

Trends in molecular medicine
|August 30, 2025
PubMed
Resumen

La terapia antirretroviral mejora el manejo del VIH pero aumenta el riesgo de enfermedad cardiovascular aterosclerótica. El VIH altera el eflujo de colesterol, un proceso clave en la aterosclerosis, lo que requiere nuevas terapias dirigidas a este mecanismo.

Palabras clave:
Transporte de cintas de unión de ATP A1Aterosclerosis asociada con el VIHflujo de colesterollipoproteínas de alta densidadReceptor X del hígadotransporte inverso del colesterol

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Área de la Ciencia:

  • Ciencias Biomédicas
  • Investigación cardiovascular
  • Enfermedades infecciosas

Sus antecedentes:

  • La terapia antirretroviral (TAR) ha hecho de la infección por el VIH una condición crónica.
  • Las personas que viven con VIH (PLWH) se enfrentan a un mayor riesgo de enfermedad cardiovascular aterosclerótica (ASCVD).
  • El eflujo de colesterol alterado de los macrófagos y la disfunción de las lipoproteínas de alta densidad (HDL) contribuyen a la aterosclerosis asociada al VIH.

Objetivo del estudio:

  • Explorar los mecanismos moleculares subyacentes al deterioro del eflujo de colesterol inducido por el VIH.
  • Revisar las terapias emergentes para el riesgo de ASCVD en PLWH.

Principales métodos:

  • Revisión de los mecanismos moleculares del impacto de la proteína HIV-Nef en el transportador de cassette de unión al ATP (ABC) A1.
  • Análisis de cómo el TAR afecta la función de los macrófagos y el HDL.
  • Exploración de nuevas estrategias terapéuticas dirigidas al transporte inverso del colesterol.

Principales resultados:

  • La proteína Nef del VIH inhibe el eflujo de colesterol mediado por ABCA1 a través de la desregulación post-transcripcional, la deslocalización y la degradación.
  • El tratamiento antirretroviral restaura parcialmente la función de los macrófagos y del HDL, pero se observa un deterioro persistente del eflujo de colesterol.
  • Las terapias emergentes son prometedoras para mejorar el transporte inverso del colesterol y reducir la replicación del VIH.

Conclusiones:

  • El deterioro del eflujo de colesterol persistente en PLWH bajo tratamiento antirretroviral contribuye a un riesgo elevado de EACV.
  • Los nuevos enfoques terapéuticos dirigidos al transporte inverso del colesterol y la replicación del VIH son cruciales para el manejo de la EACV en PLWH.