Discovered some 40 years ago, the If current has since been known as the "pacemaker" current due to its role in the initiation and modulation of the heartbeat and of neuronal excitability. But this is not all, the funny current keeps entertaining the researchers; indeed, several data discovering novel and uncanonical roles of f/HCN channel are quickly accumulating. In the present review, we provide an overview of the expression and cellular functions of HCN/f channels in a variety of systems/organs, and particularly in sour taste transduction, hormones secretion, activation of astrocytes and microglia, inhibition of osteoclastogenesis, renal ammonium excretion, and peristalsis in the gastrointestinal and urine systems. We also analyzed the role of HCN channels in sustaining cellular respiration in mitochondria and their participation to mitophagy under specific conditions. The relevance of HCN currents in undifferentiated cells, and specifically in the control of stem cell cycle and in bioelectrical signals driving left/right asymmetry during zygote development, is also considered. Finally, we present novel data concerning the expression of HCN mRNA in human leukocytes. We can thus conclude that the emerging evidence presented in this review clearly points to an increasing interest and importance of the "funny" current that goes beyond its role in cardiac sinoatrial and neuronal excitability regulation.

The funny current: Even funnier than 40 years ago. Uncanonical expression and roles of {HCN}/f channels all over the body / P. Benzoni, G. Bertoli, F. Giannetti, C. Piantoni, R. Milanesi, M.M. Pecchiari, A.F. Barbuti, M. Baruscotti, A. Bucchi. - In: PROGRESS IN BIOPHYSICS & MOLECULAR BIOLOGY. - ISSN 0079-6107. - (2021), pp. 1-16. [Epub ahead of print] [10.1016/j.pbiomolbio.2021.08.007]

The funny current: Even funnier than 40 years ago. Uncanonical expression and roles of {HCN}/f channels all over the body

Patrizia Benzoni;Giorgia Bertoli;Federica Giannetti;Raffaella Milanesi;Matteo Pecchiari;Andrea Barbuti;Mirko Baruscotti;Annalisa Bucchi
2021

Abstract

Discovered some 40 years ago, the If current has since been known as the "pacemaker" current due to its role in the initiation and modulation of the heartbeat and of neuronal excitability. But this is not all, the funny current keeps entertaining the researchers; indeed, several data discovering novel and uncanonical roles of f/HCN channel are quickly accumulating. In the present review, we provide an overview of the expression and cellular functions of HCN/f channels in a variety of systems/organs, and particularly in sour taste transduction, hormones secretion, activation of astrocytes and microglia, inhibition of osteoclastogenesis, renal ammonium excretion, and peristalsis in the gastrointestinal and urine systems. We also analyzed the role of HCN channels in sustaining cellular respiration in mitochondria and their participation to mitophagy under specific conditions. The relevance of HCN currents in undifferentiated cells, and specifically in the control of stem cell cycle and in bioelectrical signals driving left/right asymmetry during zygote development, is also considered. Finally, we present novel data concerning the expression of HCN mRNA in human leukocytes. We can thus conclude that the emerging evidence presented in this review clearly points to an increasing interest and importance of the "funny" current that goes beyond its role in cardiac sinoatrial and neuronal excitability regulation.
HCN channels; Hyperpolarization-activated current; I(h) current; Leukocytes; Max 6) I(f) current; Smooth muscle
Settore BIO/09 - Fisiologia
14-ago-2021
PROGRESS IN BIOPHYSICS & MOLECULAR BIOLOGY
https://www.sciencedirect.com/science/article/pii/S0079610721001000?via=ihub
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/863839
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