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Neopterin--its clinical use in urinalysis
D Fuchs1, C Stahl-Hennig, A Gruber
1Institute of Medical Chemistry and Biochemistry, University of Innsbruck, Austria.
Kidney International. Supplement
|November 1, 1994
Summary
Neopterin levels rise during immune responses and can be measured in urine or serum. Studies show urine and serum neopterin are equally valuable for diagnostics, with a circulation half-life of 90 minutes.
Area of Science:
- Biochemistry
- Immunology
- Clinical Diagnostics
Background:
- Neopterin is a biomarker released during cellular immune responses.
- Elevated neopterin levels are associated with viral infections, malignancies, and autoimmune diseases.
- Monitoring neopterin aids in detecting allograft rejection episodes.
Purpose of the Study:
- To investigate the excretion kinetics of neopterin.
- To compare the diagnostic utility of serum and urine neopterin measurements.
Main Methods:
- Intravenous administration of a high dose of neopterin to a rhesus monkey.
- Analysis of urinary neopterin concentrations over time.
- Comparison of serum and urine neopterin levels in HIV-seropositive and seronegative individuals.
Main Results:
- A rapid increase in urinary neopterin concentrations was observed after intravenous administration.
- The estimated half-life of neopterin in circulation was 90 minutes.
- A strong correlation and comparable diagnostic sensitivity were found between serum and urine neopterin measurements.
Conclusions:
- Neopterin excretion kinetics can be characterized by its rapid clearance.
- Serum and urine neopterin concentrations provide equivalent diagnostic information when renal function is normal.
- Neopterin monitoring remains a valuable tool in assessing immune status and disease activity.