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Types of voltage-gated calcium channels: molecular and electrophysiological views
1Department of Laboratory Medicine, Teikyo University School of Medicine, Tokyo, Japan. tfrkw@med.teikyo-u.ac.jp.
Abstract:
Voltage-gated calcium (Ca(2+)) channels are ubiquitous in excitable cells, and intracellular Ca(2+) transients, in which the channels play key roles, trigger many physiological events. At this time, 10 members of the voltage-gated Ca(2+) channel family in mammals are recognized, and they play diverse roles in the signal transduction system. The CaV1 subfamily (L-type) is involved in contraction, secretion, integration of synaptic input in neurons, regulation of gene expression, and, in specialized sensory cells, synaptic transmission at ribbon synapses. The members of the CaV2 subfamily (P/Q-, N-, and R-types) initiate synaptic transmission at fast synapses. The CaV3 subfamily is important in rhythmically firing cells such as cardiac nodal cells and thalamic neurons. The channels in this family are essential for the cyclic firing of action potentials. This article summarizes the relationships between the molecular and physiological functions of these Ca(2+) channel proteins.
Insights
Voltage-gated calcium channels are crucial for physiological events in excitable cells. This review details the molecular and physiological functions of the 10 mammalian Ca(2+) channel types.
Area of Science:
- Cellular Biology
- Neuroscience
- Physiology
Background:
- Voltage-gated calcium (Ca(2+)) channels are essential in excitable cells, regulating physiological events via intracellular Ca(2+) transients.
- Ten mammalian voltage-gated Ca(2+) channel members are identified, each with distinct roles in signal transduction.
- These channels are vital for processes including muscle contraction, hormone secretion, neuronal integration, gene expression, and synaptic transmission.
Purpose of the Study:
- To summarize the molecular and physiological functions of mammalian voltage-gated calcium channel proteins.
- To elucidate the diverse roles of Ca(2+) channel subfamilies (CaV1, CaV2, CaV3) in cellular and organismal physiology.
Main Methods:
- Literature review and synthesis of existing research on voltage-gated calcium channels.
- Categorization of Ca(2+) channel functions based on subfamily (CaV1, CaV2, CaV3).
Main Results:
- CaV1 channels (L-type) mediate contraction, secretion, neuronal integration, gene regulation, and ribbon synapse transmission.
- CaV2 channels (P/Q-, N-, R-types) are key for fast synaptic transmission.
- CaV3 channels are critical for rhythmic firing in cells like cardiac nodal cells and thalamic neurons, essential for action potential cycling.
Conclusions:
- Mammalian voltage-gated calcium channels exhibit diverse molecular and physiological functions.
- The distinct roles of CaV1, CaV2, and CaV3 subfamilies highlight their importance in various physiological processes, from muscle activity to neuronal communication and rhythmicity.
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