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• W2110069585 abstract "We have examined the effects of morphine, a mu-opioid receptor agonist, on various membrane ionic currents in rat ventricular and human atrial myocytes, using patch-clamp techniques in the whole-cell configuration. Morphine produced a concentration-dependent reduction in peak transient sodium current. When the sodium current (INa) was evoked at 5-s intervals the estimated IC50 for morphine was approximately 30 mumol litre-1. Morphine 10 mumol litre-1 inhibited INa with a 5-mV shift in the potential-dependent inactivation curve to negative potentials and retarded the INa recovery rate from the inactivated state. Use-dependent INa block was not observed when INa was elicited at frequencies varying from 0.2 to 20 Hz. Morphine did not significantly affect the inward calcium current (ICa), transient outward current (Ito) or the inwardly rectifying potassium current (IK1) at a concentration of 30 mumol litre-1. The inhibitory effect of morphine on INa could not be prevented or reversed by treatment with the opioid antagonist naloxone. Therefore, we suggest that morphine can directly inhibit the Na+ inward current and bind to inactivated Na+ channels." @default.
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• W2110069585 date "1998-12-01" @default.
• W2110069585 modified "2023-10-17" @default.
• W2110069585 title "Opioid receptor independent effects of morphine on membrane currents in single cardiac myocytes" @default.
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• W2110069585 doi "https://doi.org/10.1093/bja/81.6.925" @default.
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