Streptozotocin-induced diabetes modulates action potentials and ion channel currents from the rat atrioventricular node.

Experimental Physiology
Kathryn H YuillJ C Hancox

Abstract

The present study was conducted to evaluate whether experimentally induced type 1 diabetes results in alterations to atrioventricular nodal (AVN) electrophysiology at the cellular level. Spontaneous action potentials (APs) and ionic currents were recorded from AVN myocytes isolated from the hearts of control rats and from those with streptozotocin-induced diabetes. Perforated patch-clamp recordings were used to assess changes in cellular AP parameters and in ionic currents. Type 1 diabetes significantly increased AP duration, whilst reducing AP firing rate, upstroke velocity and rate of diastolic depolarization. The diabetes-induced changes in AP parameters were accompanied by a significant leftward shift in the zero current potential under voltage clamp, a reduction in peak L-type Ca(2+) current density and reduced amplitude of delayed rectifier and hyperpolarization-activated currents. These findings demonstrate that experimentally induced type 1 diabetes can lead to remodelling of AVN cellular electrophysiology.

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Citations

Feb 5, 2013·American Journal of Physiology. Heart and Circulatory Physiology·Chaoqin XieFadi G Akar
Jan 5, 2012·PloS One·Niclas NorrströmNoél M A Holmgren
Apr 21, 2016·PloS One·Zannatul FerdousFrank Christopher Howarth
Jul 22, 2017·Molecular Medicine Reports·Frank Christopher HowarthThomas Edward Adrian

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