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Related Concept Videos

Urine Studies I: Urinalysis01:29

Urine Studies I: Urinalysis

Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
Urinary Tract Calculi I: Introduction01:28

Urinary Tract Calculi I: Introduction

Renal calculi, or kidney stones, are solid deposits of minerals and salts formed inside the kidneys. In medical terminology, "calculus" refers to the stone itself, while "lithiasis" describes the process of stone formation. Depending on their location within the urinary system, these stones may be classified as either urolithiasis, when situated within the urinary tract, or nephrolithiasis, when located within the kidneys. Each term signifies the specific impact of the stone.Predisposition...
Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
Inflammatory Response II: Inflammatory Exudate and Tissue Repair01:24

Inflammatory Response II: Inflammatory Exudate and Tissue Repair

The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the exudate's...

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Related Experiment Video

Updated: Jun 19, 2026

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
07:45

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis

Published on: February 9, 2021

Sodium and potassium urate crystals differ in their inflammatory potential.

Christine Schorn1, Christina Janko, Luis Munoz

  • 1Department for Internal Medicine 3, Institute for Clinical Immunology, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany. christine.schorn@uk-erlangen.de

Autoimmunity
|October 9, 2009
PubMed
Summary

Uric acid crystals trigger immune responses differently based on their cation. Monosodium urate (MSU) crystals, found extracellularly, induce inflammation, unlike intracellular monopotassium urate (MPU) crystals.

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Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
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Area of Science:

  • Biochemistry
  • Immunology
  • Crystal Biology

Background:

  • Uric acid (UA) acts as a danger signal from dying cells.
  • UA precipitates as monosodium urate (MSU) in extracellular fluid and monopotassium urate (MPU) in intracellular fluid.
  • The differing environments suggest potential functional distinctions between MSU and MPU crystals.

Purpose of the Study:

  • To investigate the structural and functional differences between MSU and MPU crystals.
  • To determine how crystal composition influences innate immune cell activation.
  • To understand the role of the local environment in urate crystal inflammatory potential.

Main Methods:

  • Ex vivo whole blood assays were utilized.
  • Structural and functional properties of MSU and MPU crystals were examined.
  • Immune cell responses to different urate crystals were measured.

Main Results:

  • MSU crystals, unlike MPU crystals, induced reactive oxygen species production.
  • MSU crystals stimulated the release of pro-inflammatory cytokines in whole blood.
  • The cation associated with the urate crystal significantly modulated innate immune cell responses.

Conclusions:

  • The cation of urate crystals dictates their inflammatory potential.
  • The local microenvironment where crystals form is critical for determining their impact on innate immunity.
  • Understanding these differences is key to addressing inflammatory conditions associated with urate crystal deposition.