ArticlePflugers Archiv : European journal of physiology2003
Modulation of manganese currents by 1, 4-dihydropyridines, isoproterenol and forskolin in rabbit ventricular cells.
Article in Pflugers Archiv : European journal of physiology, 2003. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 12 citations in OpenAlex.
- Bright Ferritin for Non-Invasive MRI Monitoring of the Fate of Transplanted hPSC-Cardiomyocytes in the Infarcted Rat Heart.Magnetic resonance in medicine · 2026Article
- Myocardial Viability Imaging using Manganese-Enhanced MRI in the First Hours after Myocardial Infarction.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2021Article
- Identification of changes in neuronal function as a consequence of aging and tauopathic neurodegeneration using a novel and sensitive magnetic resonance imaging approach.Neurobiology of aging · 2017Article
- Displacement-encoded and manganese-enhanced cardiac MRI reveal that nNOS, not eNOS, plays a dominant role in modulating contraction and calcium influx in the mammalian heart.American journal of physiology. Heart and circulatory physiology · 2012Article
- Emerging MRI methods in translational cardiovascular research.Journal of cardiovascular translational research · 2011Review
- Excitation-contraction coupling and mitochondrial energetics.Basic research in cardiology · 2007Review
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Authors and funding
4 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Although often used as a Ca(2+) channel blocker, Mn(2+), in fact, permeates through Ca(2+) channels. Under Na(+)-free conditions, depolarizing pulses evoked slowly-decaying Mn(2+) currents ( I(Mn)). Maximal I(Mn) densities in the presence of 5 and 20 mM Mn(2+) were 0.42+/-0.12 pA/pF (mean+/-SEM, n=17) and 1.23+/-0.10 pA/pF ( n=40), respectively. At 5 mM, the ratio of maximal amplitude of I(Mn) to that of the Ca(2+) current ( I(Ca)) was 0.079+/-0.009 ( n=8). I(Mn) elicited from a holding potential of -50 mV was depressed by nitrendipine (1 microM) by approximately 70%. Nitrendipine (0.3 microM) shifted the steady-state inactivation curve to more negative potentials and shifted the potential for half-maximal inactivation ( E(0.5)) from 1.3 to -8.8 mV and also decreased the time constant of decay of I(Mn) at 20 mV from 986.2 to 167.9 ms. BAY K 8644 (1 microM), isoproterenol (10 microM) and forskolin (10 microM) all increased I(Mn) and shifted the current/voltage ( I/ V) relationship to more negative potentials. The small, slowly-inactivating I(Mn) is thus modulated by dihydropyridine Ca(2+) channel modulators and cyclic AMP-mediated phosphorylation in a manner similar to other L-type Ca(2+) channel currents. L-type Ca(2+) channels are involved in the regulation of intracellular [Mn] in ventricular myocytes.
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