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Nutritional rickets: thoughts about pathogenesis

G L Klein1, D J Simmons

  • 1University of Texas Medical Branch, Department of Pediatrics, Galveston 77555.

Annals of Medicine
|August 1, 1993
PubMed
Summary
This summary is machine-generated.

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Nutritional rickets pathogenesis remains unclear, despite known causes like vitamin D deficiency. Local factors in extracellular fluid may impair mineralization, potentially involving cytokines in cellular regulation.

Area of Science:

  • Biochemistry
  • Pathophysiology
  • Endocrinology

Background:

  • The exact pathogenesis of nutritional rickets is not fully understood.
  • Known etiologies include deficiencies in vitamin D, calcium (Ca), or phosphate (PO4), and potentially aluminum toxicity.
  • The specific roles of these nutrients in developing tissue anomalies in rachitic cartilage and bone require definition.

Purpose of the Study:

  • To investigate the underlying mechanisms in the pathogenesis of nutritional rickets.
  • To explore the significance of biochemical alterations in rachitic bone and cartilage.
  • To identify potential local factors and cellular regulators involved in impaired mineralization.

Main Methods:

  • Analysis of extracellular fluid (ECF) Ca and PO4 concentrations in rachitic tissues.

Related Experiment Videos

  • Observation of matrix mineralization in vitro and in vivo upon exposure to Ca and PO4 salts.
  • Consideration of the role of cytokines in cellular regulation of Ca and PO4.

    • Main Results:

    • Reported biochemical alterations in rachitic tissues have questionable significance as tissues remineralize rapidly when exposed to Ca and PO4.
    • Low Ca and PO4 concentrations in the ECF bathing rachitic cartilage and bone suggest local mechanisms impair mineralization.
    • In healing rickets, tissue fluid Ca and PO4 increase, coinciding with matrix remineralization.

    Conclusions:

    • Local mechanisms within the extracellular fluid likely impair mineralization in nutritional rickets.
    • The precise determinants of ECF Ca and PO4 content require further investigation.
    • Cytokines may offer a common pathway for the pathogenesis of rickets by regulating Ca and PO4 and endochondral ossification.