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Related Experiment Videos

Chick osteoblasts contain fluoride-sensitive acid phosphatase activity.

M W Lundy1, K H Lau, H C Blair

  • 1Department of Medicine, Loma Linda University, California 92357.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|September 1, 1988
PubMed
Summary

Chicken osteoblasts possess a fluoride-sensitive acid phosphatase. Low fluoride concentrations (microM) inhibit osteoblastic acid phosphatase, but not osteoclastic acid phosphatase, suggesting a role in bone formation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Histology

Background:

  • Bone matrix acid phosphatases play roles in bone metabolism.
  • Fluoride is known to affect bone formation and resorption.
  • The cellular origin and specific sensitivities of bone acid phosphatases to fluoride are not fully elucidated.

Purpose of the Study:

  • To determine the cellular origin of bone matrix fluoride-sensitive acid phosphatase in chicken bone.
  • To investigate the differential sensitivity of osteoblastic and osteoclastic acid phosphatases to fluoride.
  • To explore the potential implications of fluoride's inhibitory effects on bone cell function.

Main Methods:

  • Histological staining of embryonic chicken calvariae for acid phosphatase activity.
  • Biochemical assays using cell extracts and purified cells (osteoblasts and osteoclasts).

Related Experiment Videos

  • Enzyme kinetics analysis to determine inhibition constants for fluoride.

    • Main Results:

    • Acid phosphatase activity was detected in osteoblasts and osteoclasts, but not fibroblasts.
    • Osteoblastic acid phosphatase showed significant inhibition at 100 microM fluoride, unlike osteoclastic acid phosphatase.
    • Fluoride acted as a partial competitive inhibitor for osteoblastic acid phosphatases (10-100 microM), with a higher inhibition constant for osteoclastic acid phosphatase (0.5 mM).

    Conclusions:

    • Chicken osteoblasts contain a fluoride-sensitive acid phosphatase.
    • Low micromolar concentrations of fluoride selectively inhibit osteoblastic acid phosphatase.
    • These findings suggest a potential mechanism for fluoride's effects on bone formation.