Face-specific incorporation of osteopontin into urinary and inorganic calcium oxalate monohydrate and dihydrate crystals.

Urological Research
Lauren A ThurgoodRosemary L Ryall

Abstract

Our aim was to examine the attachment to, and incorporation of intact, highly phosphorylated osteopontin (OPN) into inorganic (i) and urinary (u) calcium oxalate monohydrate (COM) and dihydrate (COD) crystals. uCOM and uCOD crystals were precipitated from ultrafiltered (UF) urine containing human milk OPN (mOPN) labelled with Alexa Fluor 647 fluorescent dye at concentrations of 0.1-5.0 mg/L. iCOM and iCOD crystals were generated in aqueous solutions at concentrations of 0.01-0.5 mg/L. Crystals were demineralised with EDTA and the resulting extracts analysed by sodium dodecyl sulphate polyacrylamide gel electrophoresis and western blotting, or examined by fluorescent confocal microscopy and field emission scanning electron microscopy before and after washing to remove proteins bound reversibly to the crystal surfaces. Binding of mOPN to pre-formed iCOM crystals was also studied in phosphate-buffered saline (PBS) and ultrafiltered (UF) urine. mOPN attached to the {100} faces and to the {010} sides of the {100}/{010} edges of iCOM crystals was removed by washing, indicating that it was not incorporated into the mineral bulk. In both PBS and urine, mOPN was attached to the {021} faces of pre-formed iCOM crystals as well as to the {...Continue Reading

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Citations

Nov 6, 2012·Urological Research·Kenjiro KohriKazumi Taguchi
Aug 15, 2014·Journal of the American Chemical Society·Sahar FarmaneshJeffrey D Rimer
Dec 10, 2013·Journal of the American Chemical Society·Sahar FarmaneshJeffrey D Rimer

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