Beating irregularity of single pacemaker cells isolated from the rabbit sinoatrial node
نویسندگان
چکیده
منابع مشابه
Ischemia alters the electrical activity of pacemaker cells isolated from the rabbit sinoatrial node.
The purpose of this study was to investigate the mechanisms responsible for ischemia-induced changes in spontaneous electrical activity. An ischemic-like Tyrode solution (pH 6.6) reversibly depolarized the maximum diastolic potential (MDP) and reduced the action potential (AP) overshoot (OS). We used SNARF-1, which is an indicator of intracellular pH (pH(i)), and perforated-patch techniques to ...
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The effects of intercellular coupling conductance on the activity of two electrically coupled isolated rabbit sinoatrial nodal cells were investigated. A computer-controlled version of the "coupling clamp" technique was used in which isolated sinoatrial nodal cells, not physically in contact with each other, were electrically coupled at various values of ohmic coupling conductance, mimicking th...
متن کاملSelected contribution: axial stretch increases spontaneous pacemaker activity in rabbit isolated sinoatrial node cells.
Isolated, spontaneously beating rabbit sinoatrial node cells were subjected to longitudinal stretch, using carbon fibers attached to both ends of the cell. Their electrical behavior was studied simultaneously in current-clamp or voltage-clamp mode using the perforated patch configuration. Moderate stretch ( approximately 7%) caused an increase in spontaneous beating rate (by approximately 5%) a...
متن کاملIonic basis of ryanodine's negative chronotropic effect on pacemaker cells isolated from the sinoatrial node.
Spontaneous electrical activity and indo 1 fluorescence ratios were recorded simultaneously in cultured pacemaker cells isolated from the rabbit sinoatrial node. Ryanodine (10 μM) reduced the amplitude of action potential-induced intracellular Ca2+([Formula: see text]) transients by 19 ± 3%, increased the time constant for their decay by 51 ± 5%, and slowed spontaneous firing by 32 ± 3%. 1,2-Bi...
متن کاملDirect inhibition of the pacemaker (If) current in rabbit sinoatrial node cells by genistein.
Genistein is a tyrosine kinase inhibitor which interferes with the activity of several ionic channels either by altering modulatory phosphorylating processes or by direct binding. In whole-cell conditions, genistein induces a partial inhibition of the pacemaker (I(f)) current recorded in cardiac sinoatrial and ventricular myocytes. We investigated the mechanism of action of genistein (50 microM...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1993
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(93)81289-x