What question did this study set out to answer?

Investigate the cellular mechanisms generating slow wave action potentials in gastric smooth muscle, specifically testing the contribution of intracellular calcium stores and membrane voltage.

April 1, 2000The Journal of PhysiologyOpen Access

Role of calcium stores and membrane voltage in the generation of slow wave action potentials in guinea‐pig gastric pylorus

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Authors

DHDirk van HeldenElectrophysiology MIMohammad ImtiazGerman Center for Neurodegenerative Diseases KNKulmira NurgaliAustralian Institute for Musculoskeletal Science

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Implication

Electrophysiological study demonstrates that membrane voltage modulates IP3-dependent calcium release in gastric smooth muscle, indicating voltage feedback drives slow wave generation.

Key Points

Investigate the cellular mechanisms generating slow wave action potentials in gastric smooth muscle, specifically testing the contribution of intracellular calcium stores and membrane voltage.
Conducted intracellular electrical recordings in isolated single bundle strips of guinea-pig gastric pylorus smooth muscle.
Tested pharmacological inhibitors and modulators of calcium handling, including ACh, BAPTA AM, cyclopiazonic acid, caffeine, ryanodine, nifedipine, and heparin across varying membrane potentials (-80 to -45 mV).
Slow waves and spontaneous transient depolarizations persisted in tetrodotoxin, nifedipine, ryanodine, and brief Ca2+-free conditions, but were inhibited by BAPTA AM, cyclopiazonic acid, caffeine, and heparin.
Membrane depolarization increased slow wave frequency and directly triggered slow wave action potentials with latencies of 0.3–4 s and refractory periods of approximately 11 s, identifying voltage-dependent modulation of IP3-mediated calcium release.

Cite This Study

Helden et al. (2000) studied this question.

synapsesocial.com/papers/6a81f5035639d4e07ebf65ed https://doi.org/10.1111/j.1469-7793.2000.00245.x

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Implication

Electrophysiological study demonstrates that membrane voltage modulates IP3-dependent calcium release in gastric smooth muscle, indicating voltage feedback drives slow wave generation.

Role of calcium stores and membrane voltage in the generation of slow wave action potentials in guinea‐pig gastric pylorus

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Implication

Key Points

Cite This Study

Role of calcium stores and membrane voltage in the generation of slow wave action potentials in guinea‐pig gastric pylorus

Discussion

Member takes

Implication

Key Points

Cite This Study

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