title: Impact of Escherichia coli on urine citrate and urease-induced crystallization.
abstract: Escherichia coli (E. coli) is usually not a urease producer. It is, however, often cultured in urinary phosphate containing calculi including ammonium magnesium phosphate stones. This suggests the possibility that E. coli might be involved in stone forming process. The effect of E. coli on urine citrate and urease-induced crystallization in human urine has been studied in vitro. E. coli was found to strongly reduce urine citrate (after 48 hours). In the E. coli inoculated samples, the urease-induced crystallization was increased. There was a strong correlation, r = 0.8, between the citrate decrease and the increase in calcium precipitation. The results indicate that E. coli and the reduced urine citrate influences urease-induced crystallization in vitro.
authors.affiliation: Department of Urology, Sahlgrenska University Hospital, Goteborg, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Edin-Liljegren
authors.forename: H H
authors.initials: HH
authors.lastname: Hedelin
authors.forename: L
authors.initials: L
authors.lastname: Grenabo
authors.forename: S
authors.initials: S
authors.lastname: Pettersson
mesh_terms: D002951:Citrates / Q000652:urine*; D019343:Citric Acid; D003460:Crystallization; D004926:Escherichia coli / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D014510:Urease / Q000494:pharmacology*
chemical_list: D002951:Citrates; D019343:Citric Acid; D014510:Urease