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Calcium regulation of urinary bladder function

M S Damaser1, K B Kim, P A Longhurst

  • 1Department of Surgery, University of Pennsylvania School of Medicine, Philadelphia, USA.

The Journal of Urology
|February 1, 1997
PubMed
Summary
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Investigating urinary bladder function, this study found that both extracellular calcium influx and intracellular calcium release are crucial for generating pressure and emptying. Inhibiting either pathway significantly impacts bladder performance.

Area of Science:

  • Urology
  • Physiology
  • Pharmacology

Background:

  • Urinary bladder function relies on complex cellular mechanisms.
  • Calcium ions play a critical role in smooth muscle contraction and relaxation.
  • Understanding calcium regulation is key to addressing bladder dysfunction.

Purpose of the Study:

  • To determine the independent effects of inhibiting extracellular calcium influx and intracellular calcium release on urinary bladder pressure generation and emptying.
  • To elucidate the specific roles of L-type calcium channels and sarcoplasmic reticulum calcium stores in bladder physiology.

Main Methods:

  • Rabbit bladders were studied in vitro using a whole organ bath system.
  • Extracellular calcium influx was blocked using diltiazem.

Related Experiment Videos

  • Intracellular calcium release was inhibited using thapsigargin and ryanodine.
  • Bladder pressure generation and emptying were assessed via field stimulation and bethanechol stimulation, measuring pressure, volume, flow rate, power, and work.

    • Main Results:

    • Inhibition of extracellular calcium influx (diltiazem) led to a decreased time to maximal pressure and increased rate of pressure generation.
    • This suggests a greater reliance on rapidly accessible intracellular calcium stores.
    • Inhibition of intracellular calcium release (thapsigargin and ryanodine) reduced the maximal rate of pressure generation due to increased diffusion distances for extracellular calcium.

    Conclusions:

    • Both extracellular calcium influx via L-type calcium channels and stimulated calcium release from the sarcoplasmic reticulum are essential for normal urinary bladder pressure generation and emptying.
    • These findings highlight the dual role of calcium signaling pathways in maintaining bladder function.