title: Measurement by Quin2 of changes of the intracellular calcium concentration in strips of the rabbit ear artery and of the guinea-pig ileum.
abstract: Ca2+ transient and force development were investigated in smooth muscle strips of the rabbit ear artery and the longitudinal layer of the guinea-pig ileum by using the fluorescent indicator Quin2. Agonists only transiently increased the fluorescence intensity despite the enhanced contraction while excess potassium resulted in a maintained light signal. In Ca2+ free solutions the release by an agonist of Ca2+ from an intracellular store can be demonstrated. These observations illustrate the usefulness of the Ca2+ indicator Quin2 in the study of the excitation-contraction coupling in smooth muscle under various conditions.
mesh_terms: D000634:Aminoquinolines / Q000378:metabolism*; D000818:Animals; D001158:Arteries / Q000378:metabolism; D002118:Calcium / Q000378:metabolism*; D005260:Female; D006168:Guinea Pigs; D007082:Ileum / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000378:metabolism*; D009131:Muscle, Smooth, Vascular / Q000378:metabolism; D011188:Potassium / Q000494:pharmacology; D011817:Rabbits
chemical_list: D000634:Aminoquinolines; C035739:Quin2; D011188:Potassium; D002118:Calcium