Calcium Channel

Calcium channels generate intracellular Ca²⁺ signals by mediating Ca²⁺ entry during depolarization in excitable cells^[1]. These signals support neurotransmitter release, hormone release, excitation-contraction coupling, pacemaker activity, gene transcription, and synaptic plasticity^[1][2]. Mechanistically, adrenergic agonists increase cardiac Ca²⁺ influx through PKA phosphorylation of Rad, which releases inhibition of calcium channels and enhances contractility^[3]. In disease research, CACNA1C/CaV1.2 links L-type calcium channel signaling to bipolar disorder, depression, schizophrenia, autism spectrum disorders, brain function, and rodent antidepressant-like behavioral actions of LTCC inhibitors^[4]. Compared with related isoforms, CaVα1 splice variants show tissue-specific expression, distinct protein-domain composition, and different pharmacological sensitivities^[5]. CaV2.2 e37a is enriched in nociceptors and couples N-type calcium channels to voltage-independent G protein inhibition by µ-opioid and GABA_B receptors^[6]. For experimental applications, blockers, toxins, gene-knockout models, agonists, and inhibitors help dissect channel-specific functions and guide next-generation CaV channel modulators^[1][5].