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Related Experiment Videos

Ca(2+)-induced Ca2+ oscillations in parathyroid cells

P Ridefelt1, E Björklund, G Akerström

  • 1Department of Surgery, Uppsala University, Sweden.

Biochemical and Biophysical Research Communications
|October 24, 1995
PubMed
Summary
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Extracellular calcium can trigger rhythmic cytoplasmic calcium oscillations in parathyroid cells from hyperparathyroid patients. These oscillations depend on intracellular calcium release and non-voltage-gated calcium influx.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Calcium Signaling

Background:

  • Hyperparathyroidism involves abnormal parathyroid gland function.
  • Cytoplasmic calcium concentration ([Ca2+]i) is crucial for parathyroid cell regulation.

Purpose of the Study:

  • To investigate the effect of extracellular calcium on [Ca2+]i in human parathyroid cells.
  • To elucidate the mechanisms underlying calcium oscillations in hyperparathyroidism.

Main Methods:

  • Primary culture of parathyroid cells from hyperparthyroid patients.
  • Measurement of cytoplasmic Ca2+ concentration ([Ca2+]i) using calcium indicators.
  • Pharmacological manipulation with calcium channel blockers (Ce3+), K+ depolarization, and thapsigargin.

Main Results:

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  • Elevated extracellular calcium (1.5-3 mM) induced rhythmic [Ca2+]i oscillations.
  • Oscillation frequency increased with extracellular calcium concentration.
  • Oscillations were dependent on intracellular calcium release and influx via non-voltage-dependent channels.

Conclusions:

  • Extracellular calcium is a potent trigger for [Ca2+]i oscillations in human parathyroid cells.
  • These oscillations involve intracellular calcium stores and calcium influx.
  • Understanding these mechanisms may offer insights into hyperparathyroidism pathophysiology.