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Pathologic calcium phosphate deposition in model systems.

P T Cheng1

  • 1Department of Pathology, Mount Sinai Hospital, University of Toronto, Canada.

Rheumatic Diseases Clinics of North America
|August 1, 1988
PubMed
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Pathologic calcium phosphate deposition, a common issue in urine and saliva, often occurs in near-neutral body fluid conditions. Understanding crystal phase formation is key to addressing calcification.

Area of Science:

  • Biomineralization
  • Crystallography
  • Pathology

Background:

  • Pathologic calcium phosphate deposition occurs in body fluids like urine and saliva.
  • In vitro models, including aqueous solutions and hydrogels, are used to study calcification.
  • Previous studies have investigated de novo formation of calcium phosphates in simulated body fluids.

Purpose of the Study:

  • To investigate the formation conditions of various biologic calcium phosphate crystal phases.
  • To understand the pH-dependent nature of calcium phosphate precipitation.
  • To correlate in vitro findings with in vivo conditions for pathologic calcification.

Main Methods:

  • De novo formation of calcium phosphates in aqueous solutions mimicking body fluids.
  • Analysis of crystal phase formation under varying pH conditions.

Related Experiment Videos

  • Evaluation of solubility and favored formation conditions for different calcium phosphate phases.

    • Main Results:

    • Calcium phosphate crystal phase formation is pH-dependent, with distinct conditions for each phase.
    • All phases, including brushite, can form in neutral solutions.
    • Hydroxyapatite (HAP) is favored in alkaline/slightly acidic fluids due to its low solubility.
    • Whitlockite formation is favored near neutrality with specific Mg:Ca ratios.
    • Octacalcium phosphate (OCP) formation is favored by low Ca:Pi and Mg:Ca ratios.
    • Brushite is the most soluble phase, favored in acidic or specific neutral/alkaline conditions.

    Conclusions:

    • Pathologic calcification often occurs in alkaline or near-neutral body fluid environments.
    • The ubiquity of HAP is attributed to its low solubility in common body fluid conditions.
    • Fluid composition (pH, Ca:Pi ratio, Mg:Ca ratio) dictates the favored calcium phosphate crystal phase.
    • Understanding these formation conditions is crucial for managing calcification-related diseases.