Abstract
Activation of cells by hormones, growth factors or neurotransmitters leads to an increased production of inositol trisphosphate (InsP3) and, after activation of the InsP3 receptor (InsP3R), to Ca2+ release from intracellular Ca2+ stores. The release of intracellular Ca2+ is characterised by a graded response when submaximal doses of agonists are used. The basic phenomenon, called “quantal Ca2+ release”, is that even the maintained presence of a submaximal dose of agonist or of InsP3 for long time periods (up to 20 min) provokes only a partial release of Ca2+. This partial, or quantal, release phenomenon is due to the fact that the initially very rapid InsP3-induced Ca2+ release eventually develops into a much slower release phase. Physiologically, quantal release allows the Ca2+ stores to function as increment detectors and to induce local Ca2+ responses. The basic mechanism for quantal release of Ca2+ is presently not known. Possible mechanisms to explain the quantal behaviour of InsP3- induced Ca2+ release include the presence of InsP3Rs with varying sensitivities for InsP3, heterogeneous InsP3R distribution, intrinsic inactivation of the InsP3Rs, and regulation of the InsP3Rs by Ca2+ store content. This article reviews critically the evidence for the various mechanisms and evaluates their functional importance. A Ca2+-mediated conformational change of the InsP3R is most likely the key feature of the mechanism for quantal Ca2+ release, but the exact mode of operation remains unclear. It should also be pointed out that in intact cells more than one mechanism can be involved.
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Parys, J.B., Missiaen, L., De Smedt, H. et al. Mechanisms responsible for quantal Ca2+ release from inositol trisphosphate-sensitive calcium stores. Pflügers Arch — Eur J Physiol 432, 359–367 (1996). https://doi.org/10.1007/s004240050145
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DOI: https://doi.org/10.1007/s004240050145