Video Experimental Relacionado
Updated: Aug 1, 2026

06:47
Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation
Published on: January 28, 2021
Producción esplanquínica de lipoproteínas de alta densidad de plasma discoidal en el hombre
Lancet (London, England)
|March 24, 1979
Resumen
Se analizaron las subfracciones de lipoproteína de alta densidad (HDL) en plasma humano. La HDL2 de la sangre venosa hepática contenía partículas discoidales nacientes, lo que sugiere una secreción en el lecho esplancánico.
Área de la Ciencia:
- El metabolismo de los lípidos.
- Investigaciones cardiovasculares en la investigación cardiovascular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La lipoproteína de alta densidad (HDL) juega un papel crucial en el transporte inverso del colesterol.
- Comprender las subfracciones de HDL es vital para evaluar el riesgo cardiovascular.
- Investigaciones anteriores se han centrado en la morfología periférica del HDL.
Objetivo del estudio:
- Para investigar la morfología de las subfracciones de HDL en plasma humano en sangre venosa arterial y hepática.
- Para comparar la morfología de HDL en diferentes lechos vasculares.
- Para aclarar el origen de las partículas nacientes de HDL.
Principales métodos:
- Se utilizó microscopía electrónica para examinar las subfracciones de HDL.
- Se recogieron muestras de sangre de las venas arteriales y hepáticas de siete sujetos humanos.
- Se analizó la morfología de HDL y se comparó entre la sangre venosa arterial y hepática.
Principales resultados:
- Las subfracciones de HDL3 de la sangre venosa arterial y hepática eran esféricas.
- La HDL2 de la sangre arterial consistía en partículas esféricas.
- La HDL2 de la sangre venosa hepática mostró una mezcla de partículas esféricas y discoidales, parecidas a la HDL naciente.
Conclusiones:
- Las partículas nacientes de HDL parecen ser secretadas en el lecho esplancánico en los seres humanos.
- La vena hepática es un sitio potencial para la secreción de HDL naciente.
- Las partículas discoidales de HDL pueden representar una forma temprana de HDL en circulación.
Videos de Conceptos Relacionados
Lipid Digestion
Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
Overview of Fatty Acid Metabolism
Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Lipid-derived Compounds in the Human Body
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
Cholesterol: Significance and Regulation
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...
Considering cholesterol and...
Lipid Absorption
Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Blood Studies for Cardiovascular System III: Serum Lipid Profile
Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...

