Profile of L-type Ca2+ current and Na+/Ca2+ exchange current during cardiac action potential in ventricular myocytes

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Profile of L-type Ca(2+) current and Na(+)/Ca(2+) exchange current during cardiac action potential in ventricular myocytes.

OBJECTIVE The L-type Ca(2+) current (I(Ca,L)) and the Na(+)/Ca(2+) exchange current (I(NCX)) are major inward currents that shape the cardiac action potential (AP). Previously, the profile of these currents during the AP was determined from voltage-clamp experiments that used Ca(2+) buffer. In this study, we aimed to obtain direct experimental measurement of these currents during cardiac AP wit...

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The role of L-type Ca2+ current and Na+ current-stimulated Na/Ca exchange in triggering SR calcium release in guinea-pig cardiac ventricular myocytes.

OBJECTIVE This study examines the relative ability of sodium current (INa)-stimulated reverse mode Na/Ca exchange and the L-type calcium current (ICa) to trigger calcium-induced calcium release (CICR) in guinea-pig ventricular myocytes. METHODS Cytosolic Ca2+ transients were recorded from enzymatically dissociated guinea-pig ventricular myocytes using Indo-1. Macroscopic membrane currents wer...

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L-type and T-type Ca2+ current in cultured ventricular guinea pig myocytes.

The aim of this investigation was to study L-type and T-type Ca(2+) current (I(CaL) and I(CaT)) in short-term cultured adult guinea pig ventricular myocytes. The isolated myocytes were suspended in serum-supplemented medium up to 5 days. Using whole-cell patch clamp techniques ICaL and ICaT were studied by applying voltage protocols from different holding potentials (-40 and -90 mV). After 5 da...

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L-type Ca2+ current in fish cardiac myocytes: effects of thermal acclimation and beta-adrenergic stimulation.

A patch-clamp analysis of L-type Ca2+ current in ventricular myocytes of cold- and warm-acclimated rainbow trout (Oncorhynchus mykiss) and crucian carp (Carassius carassius) hearts was performed. Trout were acclimated at 4 and 17 degrees C and carp at 4 and 24 degrees C for a minimum of 4 weeks. Ventricular myocytes were isolated by enzymatic dissociation using collagenase and trypsin. Marked s...

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Inhibition of L-type Ca2+ current by ginsenoside Rd in rat ventricular myocytes

BACKGROUND Ginsenoside Rd (GSRd), one of the most abundant ingredients of Panax ginseng, protects the heart via multiple mechanisms including the inhibition of Ca(2+) influx. We intended to explore the effects of GSRd on L-type Ca(2+) current (I Ca,L) and define the mechanism of the suppression of I Ca,L by GSRd. METHODS Perforated-patch recording and whole-cell voltage clamp techniques were ...

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ژورنال

عنوان ژورنال: Heart Rhythm

سال: 2012

ISSN: 1547-5271

DOI: 10.1016/j.hrthm.2011.08.029