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The iCAPTUR4E Center, University of British Columbia, St. Paul's Hospital, Vancouver, British Columbia, V6Z 1Y6; and Cardiovascular Sciences, Children's and Women's Health Centre of British Columbia, Vancouver, British Columbia V6H 3N1, Canada
Vascular smooth muscle shows both plasticity and heterogeneity with respect to Ca2+ signaling. Physiological perturbations in cytoplasmic Ca2+ concentration ([Ca2+]i) may take the form of a uniform maintained rise, a transient uniform [Ca2+]i elevation, a transient localized rise in [Ca2+]i (also known as spark and puff), a transient propagated wave of localized [Ca2+]i elevation (Ca2+ wave), recurring asynchronous Ca2+ waves, or recurring synchronized Ca2+ waves dependent on the type of blood vessel and the nature of stimulation. In this overview, evidence is presented which demonstrates that interactions of ion transporters located in the membranes of the cell, sarcoplasmic reticulum, and mitochondria form the basis of this plasticity of Ca2+ signaling. We focus in particular on how the junctional complexes of plasmalemma and superficial sarcoplasmic reticulum, through the generation of local cytoplasmic Ca2+ gradients, maintain [Ca2+]i oscillations, couple these to either contraction or relaxation, and promote Ca2+ cycling during homeostasis.
cytoplasmic calcium concentration; sarcoplasmic reticulum; plasma membrane
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