نتایج جستجو برای: hcn4
تعداد نتایج: 319 فیلتر نتایج به سال:
The funny or hyperpolarization-activated cyclic nucleotide-gated channel (HCN) modulates cardiac excitability and heart rate by regulating the If or IKf current in sinoatrial cells. The 4 HCN channel isoforms (HCN1–4) are unique in that they are activated by both cyclic adenosine monophosphate (AMP) and hyperpolarized membrane channels. Thus, sympathetic activation of b-adrenergic receptors (b-...
Patients carrying the heterozygous A414G mutation in HCN4 gene, which encodes protein, demonstrate moderate to severe bradycardia of heart. Tetramers subunits compose ion channels sinus node that carry hyperpolarization-activated ‘funny’ current (If), also named ‘pacemaker current’. If plays an essential modulating role pacemaker activity. To assess mechanism by results bradycardia, we first pe...
It was only ten years ago that mutations in ion channel genes were first described in patients with the long QT syndrome (LQTS) [1]. Since then, mutations in a total of eight different sarcolemmal ion channel subunit genes (KCNQ1, KCNH2, KCNE1, KCNE2, SCN5A, KCNJ2, HCN4, CACNA1C), two genes encoding sarcoplasmic reticulum (SR) Ca handling proteins (RYR2, CASQ2), and an anchoring protein gene (A...
Hyperpolarization and Cyclic Nucleotide (HCN) -gated channels represent the molecular correlates of the "funny" pacemaker current (I(f)), a current activated by hyperpolarization and considered able to influence the sinus node function in generating cardiac impulses. HCN channels are a family of six transmembrane domain, single pore-loop, hyperpolarization activated, non-selective cation channe...
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