Adhesion at calcium oxalate crystal surfaces and the effect of urinary constituents.

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  • Author(s): Sheng X;Sheng X; Jung T; Wesson JA; Ward MD
  • Source:
    Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2005 Jan 11; Vol. 102 (2), pp. 267-72. Date of Electronic Publication: 2004 Dec 29.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: National Academy of Sciences Country of Publication: United States NLM ID: 7505876 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0027-8424 (Print) Linking ISSN: 00278424 NLM ISO Abbreviation: Proc Natl Acad Sci U S A Subsets: MEDLINE
    • Publication Information:
      Original Publication: Washington, DC : National Academy of Sciences
    • Subject Terms:
      Calcium Oxalate/*chemistry ; Citric Acid/*pharmacology ; Kidney Calculi/*urine; Adhesiveness ; Crystallization ; Humans ; Microscopy, Atomic Force ; Protein Binding
    • Abstract:
      Kidney stones, aggregates of microcrystals, most commonly contain calcium oxalate monohydrate (COM) as the primary constituent. The aggregation of COM microcrystals and their attachment to epithelial cells are thought to involve adhesion at COM crystal surfaces, mediated by anionic molecules or urinary macromolecules. Identification of the most important functional group-crystal face adhesive combinations is crucial to understanding the stability of COM aggregates and the strength of their attachments to epithelial cell surfaces under flow in the renal tubules of the kidney. Here, we describe direct measurements of adhesion forces, by atomic force microscopy, between various functional groups and select faces of COM crystals immersed in aqueous media. Tip-immobilized carboxylate and amidinium groups displayed the largest adhesion forces, and the adhesive strength of the COM crystal faces decreased in the order (100) > (121) > (010), demonstrating that adhesion is sensitive to the structure and composition of crystal faces. The influence of citrate and certain urinary proteins on adhesion was examined, and it was curious that osteopontin, a suspected regulator of stone formation, increased the adhesion force between a carboxylate tip and the (100) crystal face. This behavior was unique among the various combinations of additives and COM crystal faces examined here. Collectively, the force measurements demonstrate that adhesion of functional groups and binding of soluble additives, including urinary macromolecules, to COM crystal surfaces are highly specific in nature, suggesting a path toward a better understanding of kidney stone disease and the eventual design of therapeutic agents.
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    • Accession Number:
      2612HC57YE (Calcium Oxalate)
      2968PHW8QP (Citric Acid)
    • Publication Date:
      Date Created: 20041231 Date Completed: 20050225 Latest Revision: 20181113
    • Publication Date:
      20240829
    • Accession Number:
      PMC544292
    • Accession Number:
      10.1073/pnas.0406835101
    • Accession Number:
      15625112