Dispel some mist on circulating biopterins: measurement, physiological interval and pathophysiological implication.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Biopterins, including tetrahydrobiopterin (BH4), dihydrobiopterin (BH2), and biopterin (B), are vital enzyme cofactors.
• Existing research on biopterins faces challenges due to analytical limitations and unclear physiological ranges.
• Understanding biopterin metabolism is crucial for various clinical applications.

Purpose of the Study:

• To develop and validate a novel analytical method for comprehensive biopterin profiling in plasma.
• To establish physiological reference intervals for plasma biopterins in healthy individuals.
• To investigate the pathophysiological implications of biopterin levels by correlating them with biochemical indicators.

Main Methods:

• A novel liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed, incorporating chemical derivatization and cold-induced phase separation.
• Plasma samples from apparently healthy individuals were analyzed to determine physiological ranges.
• Statistical analyses were performed to explore correlations between biopterin levels and clinical parameters.

Main Results:

• The developed LC-MS/MS method demonstrated reliability for detecting biopterins across physiological ranges, emphasizing the need for timely anti-oxidation.
• Established physiological ranges for BH4, BH2, BH4/BH2 ratio, and total biopterins were reported.
• Significant correlations were observed between biopterin status and factors such as age, gender, hyperuricemia, and overweight conditions.

Conclusions:

• The novel LC-MS/MS method, with appropriate anti-oxidation, allows for accurate plasma biopterin assessment.
• The established physiological intervals and identified pathophysiological correlations provide a foundation for future clinical research.
• This study enhances the understanding of biopterin's role in human health and disease.