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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.
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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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.
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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.
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Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
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The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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[Familial chylomicronemia].

Pedro J Quiroga-Padilla1, Paula V Gaete1, Carlos O Mendivil1,2

  • 1Universidad de los Andes, Facultad de Medicina, Bogotá, Colombia.

Medicina
|August 26, 2020
PubMed
Summary
This summary is machine-generated.

Familial chylomicronemia, a genetic disorder, causes severe hypertriglyceridemia and complications like pancreatitis. Early detection via genetic testing and risk scores aids management with specialized diets and emerging biotechnologies.

Keywords:
apoC-IIIchylomicronemiadyslipidemiashypertriglyceridemiatriglyceridesvolanesorsen

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Area of Science:

  • Genetics
  • Metabolic Disorders
  • Cardiovascular Medicine

Background:

  • Familial chylomicronemia (FCM) is a rare genetic disorder characterized by extremely high plasma triglyceride levels.
  • This condition arises from mutations affecting triglyceride-rich lipoprotein metabolism, primarily involving the lipoprotein lipase (LPL) enzyme.
  • FCM significantly impacts patient quality of life and is associated with severe complications, most notably acute pancreatitis.

Purpose of the Study:

  • To provide a comprehensive overview of familial chylomicronemia, including its genetic basis, clinical manifestations, and diagnostic approaches.
  • To discuss current and emerging therapeutic strategies for managing FCM.
  • To highlight the importance of early detection and multidisciplinary management.

Main Methods:

  • Review of genetic mutations in genes such as LPL, APOC2, APOAV, LMF-1, and GPIHBP-1.
  • Analysis of clinical presentation, including severe hypertriglyceridemia, eruptive xanthomas, lipemia retinalis, and abdominal pain.
  • Evaluation of diagnostic tools including risk scores and genetic testing.
  • Assessment of current treatment modalities: nutritional therapy, fibrates, omega-3 fatty acids, and novel biotechnological agents.

Main Results:

  • Genetic mutations in LPL and related genes are the primary cause, though variants remain unidentified in ~30% of cases.
  • Clinical suspicion is warranted in patients with severe hypertriglyceridemia unresponsive to conventional treatment or presenting with specific signs.
  • Nutritional therapy (very-low-fat diet) and avoidance of alcohol are foundational.
  • Emerging treatments include antisense oligonucleotides (e.g., volanesorsen) and monoclonal antibodies (e.g., evinacumab) targeting underlying molecular defects.

Conclusions:

  • Familial chylomicronemia requires prompt diagnosis and management due to its severe health consequences.
  • A combination of lifestyle modifications, conventional therapies, and advanced biotechnological agents offers improved treatment outcomes.
  • Continued research into genetic underpinnings and therapeutic targets is crucial for optimizing patient care.