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Related Experiment Videos

Sarcoplasmic reticulum function and contractile consequences in ureteric smooth muscles.

Theodor Burdyga1, Susan Wray

  • 1Department of Physiology, The University of Liverpool, UK.

Novartis Foundation Symposium
|August 8, 2002
PubMed
Summary

The sarcoplasmic reticulum limits ureter contraction in guinea pigs via Ca2+-induced Ca2+ release, but potentiates it in rats through inositol-1,4,5-trisphosphate-induced Ca2+ release. This species-dependent role impacts cell signaling and excitation-contraction coupling.

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Area of Science:

  • Physiology
  • Cell Biology
  • Urology

Background:

  • The sarcoplasmic reticulum (SR) plays a critical role in regulating intracellular calcium (Ca2+) levels, which are essential for cellular functions including muscle contraction.
  • Two primary mechanisms of Ca2+ release from the SR are Ca2+-induced Ca2+ release (CICR) and inositol-1,4,5-trisphosphate (InsP3)-induced Ca2+ release (IICR).
  • The specific mechanisms and roles of SR Ca2+ release in ureteric contractile activity are not fully elucidated and may vary between species.

Purpose of the Study:

  • To investigate the distinct roles of CICR and IICR from the SR in controlling contractile activity within the ureter.
  • To characterize the types of Ca2+ release channels (ryanodine receptors and InsP3 receptors) present in guinea-pig and rat ureters.
  • To understand how these SR Ca2+ release events influence the electrical activity and contractility of ureteric cells.

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Main Methods:

  • Electrophysiological recordings (e.g., spontaneous transient outward currents) in isolated ureteric cells.
  • Application of pharmacological agents (e.g., caffeine, heparin) to modulate SR Ca2+ release.
  • Measurement of Ca2+ sparks and puffs to visualize SR Ca2+ release events.
  • Assessment of action potential characteristics and contractile force in response to SR modulation.

Main Results:

  • Guinea-pig ureter SR exclusively utilizes CICR via ryanodine receptors, generating Ca2+ sparks that limit contraction by promoting hyperpolarization.
  • Rat ureter SR exclusively utilizes IICR via InsP3 receptors, generating Ca2+ puffs that potentiate contraction through depolarization and increased Ca2+ influx.
  • Modulation of SR Ca2+ release significantly altered action potential duration and ureteric contractility in a species-specific manner.

Conclusions:

  • The sarcoplasmic reticulum's role in ureteric contractility is species-dependent, acting to limit contraction in guinea pigs and potentiate it in rats.
  • CICR and IICR mechanisms differentially regulate ureteric cell excitability and excitation-contraction coupling.
  • The ureter serves as a valuable model system for studying SR function due to its distinct, species-specific expression of Ca2+ release pathways, with potential implications for understanding human ureter physiology and disease.