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Urease Activity – Significance, Diagnostics and Treatment

Urease activity refers to the ability of certain bacteria to break down urea using the enzyme urease. It plays a key role in diagnosing stomach infections and urinary tract diseases.

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Things worth knowing about "Urease Activity"

Urease activity refers to the ability of certain bacteria to break down urea using the enzyme urease. It plays a key role in diagnosing stomach infections and urinary tract diseases.

What Is Urease Activity?

Urease activity describes the biochemical capability of the enzyme urease to hydrolyze urea into ammonia and carbon dioxide. This enzyme is produced by specific microorganisms, most notably the stomach bacterium Helicobacter pylori. Urease activity serves as an important diagnostic marker and has significant clinical relevance in diseases affecting the gastrointestinal tract and urinary system.

Biochemical Background

Urease catalyzes the following reaction:

Urea (CO(NH₂)₂) is broken down by urease into ammonia (NH₃) and carbon dioxide (CO₂).
The resulting ammonia raises the local pH, enabling certain microorganisms to survive in acidic environments.

This property allows bacteria such as Helicobacter pylori to neutralize the highly acidic stomach environment and colonize the gastric mucosa over the long term.

Clinical Significance

Helicobacter pylori Infection

The urease activity of Helicobacter pylori is particularly relevant in clinical medicine. The bacterium colonizes the stomach lining and uses its urease to create a protective ammonia layer, which can lead to the following conditions:

Gastritis (inflammation of the gastric mucosa)
Gastric and duodenal ulcers (peptic ulcers)
Increased risk of gastric carcinoma (stomach cancer)

Urinary Tract Infections

Urease-producing bacteria such as Proteus mirabilis or Klebsiella pneumoniae can split urea within the urinary tract. The resulting ammonia raises urinary pH, which promotes the formation of struvite stones (kidney stones) and can contribute to chronic urinary tract infections.

Diagnostic Use of Urease Activity

Urease activity is utilized in clinical diagnostics in several ways:

Rapid Urease Test (CLO Test)

In the rapid urease test, a biopsy sample from the gastric mucosa is placed in a test medium containing urea. If Helicobacter pylori is present, its urease breaks down the urea, and a color indicator detects the rise in pH caused by the ammonia. Results are typically available within a few hours.

13C Urea Breath Test

The 13C urea breath test is a non-invasive method for detecting Helicobacter pylori infection. The patient drinks a solution containing labeled urea (13C-urea). If the bacterium is present, its urease splits the urea, and the labeled carbon dioxide (13CO₂) can be measured in the exhaled breath.

Microbiological Differentiation

In microbiology, urease activity is used to distinguish between bacterial species. A positive urease test helps identify organisms such as Proteus mirabilis, Helicobacter pylori, or Klebsiella from other pathogens.

Treatment of Urease-Active Infections

Treatment of infections in which urease activity plays a role depends on the causative organism:

Helicobacter pylori eradication: A combination of two antibiotics (e.g., clarithromycin and amoxicillin) and a proton pump inhibitor (PPI) is used as triple therapy to eliminate the bacterium.
Urinary tract infections: Antibiotics effective against urease-producing bacteria are used, along with removal of urinary stones if necessary.
Urease inhibitors: Specific urease inhibitors are being investigated in research and clinical settings as a targeted approach to suppress the activity of urease-producing bacteria.

References

World Health Organization (WHO): Helicobacter pylori and Gastric Cancer. WHO Press, Geneva.
Malfertheiner P. et al. - European Helicobacter and Microbiota Study Group (EHMSG): Management of Helicobacter pylori infection - the Maastricht V/Florence Consensus Report. Gut, 2017; 66(1):6-30.
Mobley H.L.T., Hausinger R.P.: Microbial Ureases: Significance, Regulation, and Molecular Characterization. Microbiological Reviews, 1989; 53(1):85-108.

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