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Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators
Published on: March 22, 2019
Ca2+-dependent modulation of voltage-gated Ca2+ channels
1Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA 52242, USA.
Biochimica Et Biophysica Acta
|January 7, 2012
Summary
Voltage-gated calcium channels (Cav) are regulated by calcium ion influx through Ca2+-dependent inactivation (CDI) and facilitation (CDF). Electrophysiology reveals CaM
Area of Science:
- Cellular physiology
- Ion channel function
- Calcium signaling
Background:
- Voltage-gated calcium channels (Cav) are crucial multi-subunit protein complexes involved in numerous physiological processes.
- Calcium ions (Ca2+) permeating the channel pore fundamentally control Cav channel activity.
- Ca2+ influx triggers feedback mechanisms, including Ca2+-dependent inactivation (CDI) and Ca2+-dependent facilitation (CDF).
Purpose of the Study:
- To review the general mechanisms underlying Cav channel CDI and CDF.
- To highlight electrophysiological approaches used to study these regulatory processes in various cell systems.
Main Methods:
- Electrophysiological analysis in native and heterologous expression systems.
- Review of existing literature on Cav channel regulation by Ca2+.
Main Results:
- Electrophysiological studies have provided significant insights into the mechanisms and prevalence of CDI and CDF.
- All Cav channel types exhibit Ca2+-dependent feedback, mediated by calmodulin (CaM) or similar Ca2+-binding proteins.
- The role of CaM in CDI and CDF has been extensively characterized.
Conclusions:
- Ca2+-dependent regulation of Cav channels is vital for diverse physiological events like muscle contraction and neurotransmitter release.
- Understanding CDI and CDF mechanisms is key to comprehending signaling in excitable cells.
- Further research is needed to explain the heterogeneity of CDI/CDF across cell types and its impact on Ca2+ signaling.
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