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. 1994 Apr;111(4):989–996. doi: 10.1111/j.1476-5381.1994.tb14841.x

Sensitivity of G-protein involved in endothelin-1-induced Ca2+ influx to pertussis toxin in porcine endothelial cells in situ.

H Aoki 1, S Kobayashi 1, J Nishimura 1, H Kanaide 1
PMCID: PMC1910159  PMID: 8032627

Abstract

1. We designed a new method to determine quantitatively the intracellular Ca2+ concentration ([Ca2+]i) in endothelial cells in situ, using front-surface fluorometry and fura-2-loaded porcine aortic valvular strips. Using this method, we investigated the characteristics of the G-protein involved in endothelin-1 (ET-1)-induced changes in [Ca2+]i of endothelial cells in situ. 2. Endothelial cells were identified by specific uptake of acetylated-low density lipoprotein labelled with 1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indocarbocyanine perchlorate (DiI-Ac-LDL). Double staining with DiI-Ac-LDL and fura-2 showed that the valvular strip was covered with a monolayer of endothelial cells and that the cellular component which contributed to the fura-2 fluorescence, [Ca2+]i signal, was exclusively endothelial cells. 3. ET-1 (10(-7) M) induced an elevation of [Ca2+]i consisting of two components: the first was a rapid and transient elevation to reach a peak, followed by a second, sustained elevation (the second phase). The first phase was composed of extracellular Ca(2+)-independent and -dependent components, while the second phase was exclusively extracellular Ca(2+)-dependent. The extracellular Ca(2+)-independent component of the first phase was due to the release of Ca2+ from intracellular storage sites. The second phase and part of the first phase of [Ca2+]i elevation were attributed to the influx of extracellular Ca2+. The Ca2+ influx component was completely inhibited by 10(-3) M Ni2+ but was not affected by 10(-5) M diltiazem.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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