title: Orotidine accumulation in human erythrocytes during allopurinol therapy: association with high urinary oxypurinol-7-riboside concentrations in renal failure and in the Lesch-Nyhan syndrome.
abstract: 1. A compound identified as orotidine has been found in the erythrocytes of all subjects on allopurinol. 2. The erythrocyte orotidine concentrations were much higher in patients with renal failure or with the Lesch-Nyhan syndrome. 3. In addition, increased amounts of oxypurinol-7-riboside were excreted in the urine by both of these groups compared with control subjects or with patients with normal renal function on allopurinol. 4. A good correlation was found between urinary oxypurinol-7-riboside excretion and erythrocyte orotidine concentrations. 5. Increased erythrocyte levels of the pyrimidine-sugar UDP-glucose were also found in patients with the highest orotidine levels. 6. The combined results suggest a derangement of pyrimidine nucleotide metabolism during allopurinol therapy. We propose that erythrocyte orotidine formation results primarily from inhibition of orotidine-5'-monophosphate decarboxylase by oxypurinol-7-ribotide.
authors.affiliation: Purine Research Laboratory, Clinical Science Laboratories, UMDS, Guy's Hospital Medical School, London.
authors.forename: H A
authors.initials: HA
authors.lastname: Simmonds
authors.forename: S
authors.initials: S
authors.lastname: Reiter
authors.forename: P M
authors.initials: PM
authors.lastname: Davies
authors.forename: J S
authors.initials: JS
authors.lastname: Cameron
mesh_terms: D000493:Allopurinol / Q000378:metabolism* / Q000627:therapeutic use; D004912:Erythrocytes / Q000378:metabolism*; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000378:metabolism*; D007926:Lesch-Nyhan Syndrome / Q000378:metabolism*; D008297:Male; D009711:Nucleotides / Q000097:blood; D010117:Oxypurinol / Q000031:analogs & derivatives* / Q000097:blood / Q000652:urine; D012263:Ribonucleosides / Q000097:blood / Q000652:urine*; D014529:Uridine / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D009711:Nucleotides; D012263:Ribonucleosides; C068668:oxypurinol 7-riboside; D000493:Allopurinol; C008714:orotidine; D010117:Oxypurinol; D014529:Uridine