Orotidinuria induced by allopurinol

Area of Science:

• Biochemistry
• Pharmacology
• Human Physiology

Background:

• Hyperuricemia is a condition characterized by elevated uric acid levels.
• Allopurinol is a medication commonly used to treat hyperuricemia.
• Orotidine is a pyrimidine nucleoside involved in nucleotide biosynthesis.

Purpose of the Study:

• To investigate the effect of allopurinol on orotidine excretion.
• To determine if allopurinol interferes with de novo pyrimidine biosynthesis in humans.

Main Methods:

• Administration of allopurinol to hyperuricemic patients and normal subjects.
• Measurement of orotidine excretion in urine.
• Analysis of pyrimidine biosynthesis pathways.

Main Results:

• Allopurinol administration led to increased orotidine excretion in both patient groups.
• Evidence suggests allopurinol inhibits the de novo synthesis of uridine 5'-phosphate.

Conclusions:

• Allopurinol impacts pyrimidine metabolism by inhibiting de novo uridine 5'-phosphate biosynthesis.
• Increased orotidine excretion serves as a biomarker for allopurinol's effect on this pathway.