Plasma dopamine beta-hydroxylase: rapid diagnostic test for recurrent hereditary polyserositis

Area of Science:

• Biochemistry
• Genetics
• Clinical Diagnostics

Background:

• Recurrent hereditary polyserositis (RHP), also known as familial Mediterranean fever (FMF), is diagnosed via exclusion due to the absence of a specific laboratory test.
• Previous research indicates a potential link between abnormal catecholamine metabolism and RHP.
• Understanding the biochemical underpinnings of RHP is crucial for developing diagnostic tools.

Purpose of the Study:

• To investigate plasma dopamine beta-hydroxylase (DBH) activity as a potential diagnostic biomarker for RHP.
• To determine if DBH activity differs between RHP patients and healthy controls.
• To assess the impact of colchicine treatment on DBH activity in RHP patients.

Main Methods:

• Plasma DBH activity was measured spectrophotometrically.
• Assays were conducted on 91 RHP patients (both symptomatic and asymptomatic) and 162 controls.
• Statistical analysis was performed to compare DBH activity levels.

Main Results:

• DBH activity was significantly higher in untreated RHP patients (symptom-free or in acute attacks) compared to controls (p < 0.0001).
• Colchicine treatment effectively reduced elevated DBH activity in RHP patients to levels observed in controls.
• The DBH activity assay demonstrated high diagnostic accuracy and specificity for RHP.

Conclusions:

• Elevated plasma DBH activity is a potential diagnostic marker for RHP, irrespective of disease activity.
• The DBH assay is a practical and accurate tool for diagnosing RHP.
• DBH activity levels may serve as an indicator for treatment efficacy in RHP.