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• W2153376408 abstract "Receptor activation may result in distinct subcellular patterns of Ca2+ release. To define the subcellular distribution of Ca2+i signals induced by stimulation of the vasopressin V1a receptor, we expressed the cloned receptor in Xenopus oocytes. Oocytes were then loaded with fluo-3 and observed using confocal microscopy. Vasopressin induced a single concentric wave of increased Ca2+ that radiated inward from the plasma membrane. With submaximal stimulation, however, regions of the Ca2+ wave spontaneously reorganized into repetitive (oscillatory) waves. Focal stimulation of a small part of the plasma membrane resulted in a Ca2+ wave which began at the point of stimulation, radiated toward the center of the cell, then reorganized into multiple foci of repetitive, colliding waves and spirals of increased Ca2+i. The pattern of Ca2+ signaling induced by focal or global stimulation was not altered in Ca(2+)-free medium, although signals did not propagate as fast. Finally, subcellular Ca2+ signaling patterns induced by vasopressin were inhibited by caffeine, while neither vasopressin nor microinjection of inositol trisphosphate blocked caffeine-induced increases in cytosolic Ca2+. Thus, stimulation of the V1a receptor in this cell system induces a complex pattern of Ca2+ signaling which is influenced by (1) the magnitude of the stimulus, (2) the distribution of the surface receptors that are stimulated, and (3) mobilization of Ca2+ from the extracellular space as well as from two distinct endogenous Ca2+ pools. The manner in which a single type of receptor is activated may represent an important potential mechanism for subcellular Ca2+i signaling." @default.
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• W2153376408 date "1992-11-01" @default.
• W2153376408 modified "2023-10-18" @default.
• W2153376408 title "Mechanisms of subcellular cytosolic Ca2+ signaling evoked by stimulation of the vasopressin V1a receptor" @default.
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• W2153376408 doi "https://doi.org/10.1016/s0021-9258(18)50088-0" @default.
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