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Related Experiment Video

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Combining Optogenetics with Artificial microRNAs to Characterize the Effects of Gene Knockdown on Presynaptic Function within Intact Neuronal Circuits

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Inactivation of CaV1 and CaV2 channels.

Worawan B Limpitikul¹, Ivy E Dick²

¹Corrigan Minehan Heart Center, Massachusetts General Hospital, Boston, MA, USA.

The Journal of General Physiology

|January 30, 2025

Summary

Voltage-gated calcium channels (VGCCs) are crucial for cell function and are regulated by inactivation. This review details voltage-dependent and calcium-dependent inactivation mechanisms in CaV1 and CaV2 channels.

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Last Updated: May 30, 2025

Combining Optogenetics with Artificial microRNAs to Characterize the Effects of Gene Knockdown on Presynaptic Function within Intact Neuronal Circuits

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Published on: March 14, 2018

Measuring Fast Calcium Fluxes in Cardiomyocytes

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Published on: November 29, 2011

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique

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Published on: November 11, 2022

Area of Science:

Neuroscience
Cell Biology
Biophysics

Background:

Voltage-gated calcium channels (VGCCs) are vital for numerous physiological processes, including synaptic transmission, cardiac excitation, and muscle contraction.
Channel regulation is critical for their diverse functions, with inactivation playing a key role in controlling cellular excitability and intracellular calcium levels.

Purpose of the Study:

To review the determinants and modulatory features of voltage-dependent inactivation (VDI) and calcium-dependent inactivation (CDI) in VGCCs.
To elucidate the roles of VDI and CDI in normal physiology and pathophysiology.

Main Methods:

Literature review of existing research on VGCC inactivation mechanisms.
Analysis of studies detailing the molecular and physiological aspects of VDI and CDI.

Main Results:

CaV1 and CaV2 channel families exhibit two primary inactivation processes: VDI and CDI.
VDI is triggered by membrane depolarization, while CDI is initiated by increased intracellular calcium.
These inactivation mechanisms are finely tuned by various modulatory factors.

Conclusions:

VDI and CDI are critical regulatory mechanisms for VGCC function, essential for maintaining cellular homeostasis.
Understanding these inactivation processes is vital for comprehending normal physiological functions and various pathological conditions.