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Related Concept Videos

Physiology of Urine Formation01:24

Physiology of Urine Formation

Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
Glomerular Filtration
The first stage in urine formation is glomerular filtration. Each kidney contains approximately 1 million nephrons, the functional units of filtration, with a...
Chronic Kidney Disease II: Clinical Manifestations01:24

Chronic Kidney Disease II: Clinical Manifestations

Chronic Kidney Disease (CKD) progressively impairs multiple body systems due to the accumulation of uremic toxins, which disrupt cellular functions across various organs.Neurologic symptomsNeurologic symptoms often arise early in CKD, as uremic toxin buildup drives changes in cognitive and motor functions. Patients frequently experience fatigue, headache, confusion, difficulty concentrating, and, in severe cases, seizures. Peripheral neuropathy commonly manifests as burning sensations in the...
Serum Studies: Renal Function Tests01:24

Serum Studies: Renal Function Tests

Renal function tests are crucial for assessing kidney health, monitoring disease progression, and evaluating the kidneys' efficiency in waste elimination, fluid balance, and electrolyte regulation. These tests offer critical insights into kidney function, even though routine measurements may appear normal until there is a significant decline in the glomerular filtration rate or GFR. Typically, signs of kidney impairment only become evident when the GFR falls to about 50% of its normal level.
Hemodialysis II: Procedure and Complications01:24

Hemodialysis II: Procedure and Complications

DialyzersA hemodialysis (HD) dialyzer is a plastic cartridge containing thousands of parallel hollow fibers, which serve as semipermeable membranes. These fibers are typically made from cellulose-based or other synthetic materials. During HD, blood is pumped into the top of the cartridge and distributed among these fibers. Simultaneously, dialysis fluid, known as dialysate, is introduced into the bottom of the cartridge, bathing the outside of the fibers. Across the semipermeable membrane,...
Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...

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Related Experiment Video

Updated: May 30, 2026

Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
07:29

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Uremia alters HDL composition and function.

Michael Holzer1, Ruth Birner-Gruenberger, Tatjana Stojakovic

  • 1Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria.

Journal of the American Society of Nephrology : JASN
|August 2, 2011
PubMed
Summary
This summary is machine-generated.

Patients with kidney disease have altered HDL, a crucial protein complex, impacting its function. This study reveals changes in HDL composition that reduce its ability to protect against cardiovascular disease in these patients.

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Area of Science:

  • Cardiovascular Science
  • Nephrology
  • Lipid Metabolism

Background:

  • Functional impairment of high-density lipoprotein (HDL) is implicated in cardiovascular mortality in renal disease patients.
  • The specific effects of advanced renal disease on HDL composition and function remain unclear.

Purpose of the Study:

  • To investigate alterations in the proteome and lipid composition of HDL from patients undergoing maintenance hemodialysis.
  • To assess the functional consequences of these compositional changes on HDL's cardioprotective properties.

Main Methods:

  • Utilized mass spectrometry and biochemical analyses to examine HDL from hemodialysis patients.
  • Analyzed proteomic and lipidomic profiles of isolated HDL particles.

Main Results:

  • Uremic HDL showed increased levels of serum amyloid A1, albumin, lipoprotein-associated phospholipase A2, and apoC-III.
  • HDL in renal disease patients exhibited reduced phospholipids and increased triglycerides and lysophospholipids.
  • These compositional changes impaired HDL's capacity for cholesterol efflux from macrophages.

Conclusions:

  • Altered HDL composition in renal disease diminishes its cardioprotective functions.
  • Assessing HDL composition and function may aid in identifying patients at higher cardiovascular risk.