1. Elementary calcium signaling in arterial smooth muscle
- Author
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Mario Kassmann, Gang Fan, Yingqiu Cui, and Maik Gollasch
- Subjects
0301 basic medicine ,Vascular smooth muscle ,Calcium Channels, L-Type ,Biophysics ,chemistry.chemical_element ,Review ,Calcium ,Biochemistry ,Muscle, Smooth, Vascular ,Cav1.2 ,Calcium in biology ,Calcium Channels, T-Type ,03 medical and health sciences ,0302 clinical medicine ,Animals ,Humans ,Calcium Signaling ,Calcium signaling ,Voltage-dependent calcium channel ,biology ,Ryanodine receptor ,Ca2+ sparks ,Arteries ,Membrane hyperpolarization ,musculoskeletal system ,Cell biology ,Cav3.2 ,030104 developmental biology ,chemistry ,caveolae ,ryanodine receptors ,cardiovascular system ,biology.protein ,tissues ,030217 neurology & neurosurgery - Abstract
Vascular smooth muscle cells (VSMCs) of small peripheral arteries contribute to blood pressure control by adapting their contractile state. These adaptations depend on the VSMC cytosolic Ca2+ concentration, regulated by complex local elementary Ca2+ signaling pathways. Ca2+ sparks represent local, transient, rapid calcium release events from a cluster of ryanodine receptors (RyRs) in the sarcoplasmic reticulum. In arterial SMCs, Ca2+ sparks activate nearby calcium-dependent potassium channels, cause membrane hyperpolarization and thus decrease the global intracellular [Ca2+] to oppose vasoconstriction. Arterial SMC Cav1.2 L-type channels regulate intracellular calcium stores content, which in turn modulates calcium efflux through RyRs. Cav3.2 T-type channels contribute to a minor extend to Ca2+ spark generation in certain types of arteries. Their localization within cell membrane caveolae is essential. We summarize present data on local elementary calcium signaling (Ca2+ sparks) in arterial SMCs with focus on RyR isoforms, large-conductance calcium-dependent potassium (BKCa) channels, and cell membrane-bound calcium channels (Cav1.2 and Cav3.2), particularly in caveolar microdomains.
- Published
- 2019
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