Hypertension Research Today is a free monthly online journal that collates and summarizes the latest research about Hypertension, including details on symptoms, diagnosis, diet, treatment, causes. | ||||||||
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Functional expression of the TRPM4 cationic current in ventricular cardiomyocytes from spontaneously hypertensive rats.Guinamard R, Demion M, Magaud C, Potreau D, Bois P Institut de Physiologie et Biologie Cellulaires, Centre National de la Recherche Scientifique Unité Mixte de Recherche, Université de Poitiers, Poitiers, France. romain.guinamard@univ-poitiers.fr Cardiac hypertrophy is associated with electrophysiological modifications, including modification of action potential shape that can give rise to arrhythmias. We report here a higher detection of a calcium-activated nonselective cation current in cardiomyocytes of spontaneously hypertensive rats (SHRs), a model of hypertension and heart hypertrophy when compared with Wistar-Kyoto (WKY) rat, its normotensive equivalent. Freshly isolated cells from the left ventricles of 3- to 6-month-old WKY rats or SHRs were used for patch-clamp recordings. In inside-out patches, the channel presented a linear conductance of 25+/-0.5 pS, did not discriminate Na(+) over K(+), and was not permeable to Ca(2+). Open probability was increased by depolarization and a rise in [Ca(2+)](i) (dissociation constant=10+/-5.4 micromol/L) but reduced by 0.5 mmol/L [ATP](i), 10 micromol/L glibenclamide, or flufenamic acid (IC(50)=5.5+/-1.7 micromol/L). Thus, it owns the fingerprint of the TRPM4 current. Although rarely detected in WKY cardiomyocytes, the current was present in >50% of patches from SHR cardiomyocytes. Moreover, by performing RT-PCR from ventricular samples, we observed that TRPM4 mRNA detection was higher in SHRs than in WKY rats. We propose that a TRPM4 current is expressed in ventricular cardiomyocytes from SHRs. According to its properties, this channel may contribute to the transient inward current implicated in delayed-after-depolarizations observed during [Ca(2+)] overload of cardiomyocytes. Published 22 September 2006 in Hypertension, 48(4): 587-94.
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