1990
DOI: 10.1152/ajpheart.1990.258.2.h574
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Simultaneous measurement of Ca2+, contraction, and potential in cardiac myocytes

Abstract: A system is described that can simultaneously record cytosolic Ca2+ concentration ([Ca2+]i), cell length, and either membrane potential or current in single cardiac myocytes loaded with the fluorescent Ca2+ indicator indo-1. Fluorescence is excited by epi-illumination with 3.8-microsecond flashes of 350 +/- 5 nm light from a xenon arc. Indo-1 fluoresence is measured simultaneously in spectral windows of 391-434 nm and 457-507 nm, and the ratio of indo-1 emission in the two bands is computed as a measure of [Ca… Show more

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Cited by 146 publications
(161 citation statements)
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“…Separately, isolated cells were loaded with 25 M Indo-1 AM and 1% pluronic acid (Molecular Probes) for 10 min at room temperature. Calcium transients were measured with external pacing at room temperature as described (22).…”
Section: Herpes Simplex Virus (Hsv)-1 Amplicon-mediated Rescuementioning
confidence: 99%
“…Separately, isolated cells were loaded with 25 M Indo-1 AM and 1% pluronic acid (Molecular Probes) for 10 min at room temperature. Calcium transients were measured with external pacing at room temperature as described (22).…”
Section: Herpes Simplex Virus (Hsv)-1 Amplicon-mediated Rescuementioning
confidence: 99%
“…16 The cells were suspended in HEPES buffer (pH 7.4) containing (mmol/L) HEPES 20, CaCl 2 1, NaCl 137, KCl 5, dextrose 15, MgSO 4 1.3, and NaH 2 PO 4 1.2. Cell length was monitored from the bright-field image by an optical edge-tracking method using a photodiode array (model 1024 SAQ, Reticon) with a 3-ms time resolution.…”
Section: Electrophysiological and Contractile Measurements In Isolatementioning
confidence: 99%
“…Cell length was monitored from the bright-field image by an optical edge-tracking method using a photodiode array (model 1024 SAQ, Reticon) with a 3-ms time resolution. 16 I Ca was measured via the whole-cell patch-clamp technique using an Axopatch 1D amplifier (Axon Instruments Inc). 1 Cells were voltage-clamped at Ϫ40 mV to inactivate Na ϩ and T-type Ca 2ϩ channels.…”
Section: Electrophysiological and Contractile Measurements In Isolatementioning
confidence: 99%
“…he ␤-adrenergic agonists are known to potentiate the force of cardiac contraction by enhancing Ca 2ϩ current (I Ca ) and Ca 2ϩ release from the internal calcium store secondary to cAMP-dependent phosphorylation of the Ca 2ϩ channel (1)(2)(3). Relaxant effect of catecholamines (4), on the other hand, appears to be mediated by phosphorylation of phospholamban and troponin C resulting in stimulation of the Ca 2ϩ pump (5,6) and decreased myofilament Ca 2ϩ sensitivity (7)(8)(9).…”
mentioning
confidence: 99%