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Related Experiment Videos

High-affinity sodium-dependent uptake of ascorbic acid by rat osteoblasts.

J X Wilson1, S J Dixon

  • 1Department of Physiology, Faculty of Dentistry, University of Western Ontario, London, Canada.

The Journal of Membrane Biology
|October 1, 1989
PubMed
Summary

Osteoblasts utilize a specialized, sodium-dependent transport system to absorb ascorbic acid, crucial for bone formation. This high-affinity mechanism ensures efficient uptake of vitamin C, supporting bone health.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Bone Physiology

Background:

  • Ascorbic acid is vital for osteoblast function and bone formation.
  • The specific mechanisms for osteoblast ascorbate transport remain largely uncharacterized.

Purpose of the Study:

  • To investigate and characterize the transport system for ascorbic acid in osteoblasts.
  • To elucidate the kinetic and regulatory properties of ascorbate uptake in bone cells.

Main Methods:

  • Utilized a rat osteoblast-like cell line (ROS 17/2.8) and primary rat calvaria cells.
  • Measured L-[14C]ascorbate uptake under varying substrate concentrations, temperatures, and ionic conditions.
  • Analyzed uptake kinetics using Michaelis-Menten models and assessed inhibition by related compounds.

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Main Results:

  • Osteoblasts demonstrated significant accumulation of L-[14C]ascorbate.
  • Ascorbate uptake exhibited saturation kinetics, indicating a high-affinity, carrier-mediated process (apparent Km = 30 µM).
  • Transport was stereoselective, Na+-dependent, and temperature-sensitive, with decreased affinity and velocity at lower Na+ concentrations.

Conclusions:

  • Osteoblasts possess a stereoselective, high-affinity, Na+-dependent transporter for ascorbic acid.
  • This transport system is crucial for regulating intracellular ascorbate levels and may play a key role in osteoblast differentiation and bone formation.