Abstract：
:Quercetin is a plant flavonoid with several biological activities. This study aimed to describe quercetin effects on contractile and electrophysiological properties of the cardiac muscle as well as on calcium handling. Quercetin elicited positive inotropism that was significantly reduced by propranolol indicating an involvement of the sympathetic nervous system. In cardiomyocytes, 30 μM quercetin increased ICa,L at 0 mV from -0.95 ± 0.01 A/F to -1.21 ± 0.08 A/F. The membrane potential at which 50% of the channels are activated (V0.5 ) shifted towards more negative potentials from -13.06 ± 1.52 mV to -19.26 ± 1.72 mV and did not alter the slope factor. Furthermore, quercetin increased [Ca2+ ]i transient by 28% when compared to control. Quercetin accelerated [Ca2+ ]i transient decay time, which could be attributed to SERCA activation. In resting cardiomyocytes, quercetin did not change amplitude or frequency of Ca2+ sparks. In isolated heart, quercetin increased heart rate and decreased PRi, QTc and duration of the QRS complex. Thus, we showed that quercetin activates β-adrenoceptors, leading to increased L-type Ca2+ current and cell-wide intracellular Ca2+ transient without visible changes in Ca2+ sparks.
journal_name
Basic Clin Pharmacol Toxicoljournal_title
Basic & clinical pharmacology & toxicologyauthors
Santos MS,Oliveira ED,Santos-Miranda A,Cruz JS,Gondim ANS,Menezes-Filho JER,Souza DS,Pinho-da-Silva L,Jesus ICG,Roman-Campos D,Guatimosim S,Lara A,Conde-Garcia EA,Vasconcelos CMLdoi
10.1111/bcpt.12743subject
Has Abstractpub_date
2017-06-01 00:00:00pages
550-559issue
6eissn
1742-7835issn
1742-7843journal_volume
120pub_type
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