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Abstract. Using the whole-cell configuration of the patch-clamp technique, we quantified calcium release from the sarcoplasmic reticulum (SR) elicited by short depolarization pulses before and after clearance of the SR Ca2+ content with 10mM caffeine (CAF). With a loaded SR, the first detectable contraction occurred with a pulse duration of 5ms. CAF exposure increased this pulse duration to 85ms and...
Abstract. The effects of calcitonin gene-related peptide (CGRP) on the transient outward current (Ito) and the L-type calcium current (ICa,L) were investigated in isolated rat ventricular cardiomyocytes using the whole-cell, patch-clamp technique. CGRP influenced neither the amplitude nor the time course of ICa,L. On the other hand, at all membrane potentials at which a significant Ito was elicited,...
Abstract. Several effects of nitric oxide (NO) on the control of L-type calcium current (ICa) and of calcium handling in cardiomyocytes have been described. Cardiomyocytes have been shown to express in different conditions all types of nitric oxide synthases (NOS), but the role of NO in the regulation of calcium current remains controversial. Previously, we have shown in guinea pig ventricular cells...
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