title: The effect of calcium and magnesium ions on urinary urokinase and sialidase activity.
abstract: The effect of a promoter (calcium) and an inhibitor (magnesium) of urolithiasis was spectrophotometrically studied on urokinase (0.45 IU) and sialidase (5 mM). Although these mineral did not affect the sialidase activity, total inhibition of urokinase activity was observed with either 0.05 M calcium chloride or 0.1 M magnesium chloride. This observation might explain why calcium and magnesium respectively function as a promoter and an inhibitor of stone formation.
authors.affiliation: Department of Urology, HF Verwoerd Hospital, University of Pretoria, Republic of South Africa.
authors.forename: C H
authors.initials: CH
authors.lastname: van Aswegen
authors.forename: J C
authors.initials: JC
authors.lastname: Dirksen van Sckalckwyk
authors.forename: P J
authors.initials: PJ
authors.lastname: du Toit
authors.forename: L
authors.initials: L
authors.lastname: Verster
authors.forename: R C
authors.initials: RC
authors.lastname: Franz
authors.forename: D J
authors.initials: DJ
authors.lastname: du Plessis
mesh_terms: D002118:Calcium / Q000494:pharmacology*; D005341:Fibrinolysin / Q000652:urine; D006801:Humans; D066298:In Vitro Techniques; D007669:Kidney Calculi / Q000209:etiology; D008274:Magnesium / Q000494:pharmacology*; D009439:Neuraminidase / Q000652:urine*; D014568:Urokinase-Type Plasminogen Activator / Q000652:urine*
chemical_list: D009439:Neuraminidase; D005341:Fibrinolysin; D014568:Urokinase-Type Plasminogen Activator; D008274:Magnesium; D002118:Calcium