Repetitive spikes in cytoplasmic calcium evoked by histamine in human endothelial cells

Abstract
Measurement of cytoplasmic free calcium, [Ca2+]i, in single human endothelial cells has shown that low doses of the inflammatory mediator histamine evoke asynchronous repetitive spikes in [Ca2+]i whereas high doses cause a maintained elevated [Ca2+]i. We discuss possible regulatory mechanisms, and the potential physiological and pathological implications of such a frequency-modulated [Ca2+]i signalling system.

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