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- W2097060765 abstract "Activation of the “funny” (pacemaker, I f ) current during the diastolic depolarization phase of an action potential is the main mechanism underlying spontaneous, rhythmic activity of cardiac pacemaker cells. In the past three decades, a wealth of evidence elucidating the function of the funny current in the generation and modulation of cardiac pacemaker activity has been gathered. The slope of early diastolic depolarization, and thus the heart rate, is controlled precisely by the degree of I f activation during diastole. I f is also accurately and rapidly modulated by changes of the cytosolic concentration of the second messenger cAMP, operated by the autonomous nervous system through β‐adrenergic, mainly β 2 , and in the opposite way by muscarinic receptor, stimulation. Recently, novel in vivo data, both in animal models and humans, have been collected that confirm the key role of I f in pacemaking. In particular, an inheritable point mutation in the cyclic nucleotide‐binding domain of human HCN4, the main hyperpolarization‐activated cyclic nucleotide (HCN) isoform contributing to native funny channels of the sinoatrial node, was shown to be associated with sinus bradycardia in a large family. Because of their properties, funny channels have long been a major target of classical pharmacological research and are now target of innovative gene/cell‐based therapeutic approaches aimed to exploit their function in cardiac rate control." @default.
- W2097060765 created "2016-06-24" @default.
- W2097060765 creator A5055939400 @default.
- W2097060765 creator A5071048677 @default.
- W2097060765 date "2008-03-01" @default.
- W2097060765 modified "2023-10-16" @default.
- W2097060765 title "Control of Cardiac Rate by “Funny” Channels in Health and Disease" @default.
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- W2097060765 doi "https://doi.org/10.1196/annals.1420.024" @default.
- W2097060765 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18375593" @default.
- W2097060765 hasPublicationYear "2008" @default.
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