Pacemaker Cells
Pacemaker Cells - Related Videos
08:52
Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
0 Views •
Cited by 13 •
2015
This protocol describes how to produce functional sinus nodal tissue from murine pluripotent stem cells (PSC). T-Box3 (TBX3) overexpression plus cardiac Myosin-heavy-chain (Myh6) promoter antibiotic selection leads to highly pure pacemaker cell aggregates. These “Induced-sinoatrial-bodies” (“iSABs”) contain over 80% pacemaker cells, show highly increased beating rates and are able to pace myocardium ex vivo.
07:38
Isolating and Imaging Live, Intact Pacemaker Regions of Mouse Renal Pelvis by Vibratome Sectioning
0 Views •
Cited by 1 •
2021
The goal of this protocol is to isolate intact pacemaker regions of the mouse renal pelvis using vibratome sectioning. These sections can then be used for in situ Ca2+ imaging to elucidate Ca2+ transient properties of pacemaker cells and other interstitial cells in vibratome slices.
09:20
Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
0 Views •
Cited by 2 •
2021
This protocol aims to describe a new methodology to measure intrinsic cardiac firing rate using microelectrode array recording of the whole sinoatrial node tissue to identify pacemaking defects in mice. Pharmacological agents can also be introduced in this method to study their effects on intrinsic pacemaking.
06:14
Translational Rabbit Model of Chronic Cardiac Pacing
0 Views •
2023
We present a minimally invasive leporine model of long-term cardiac pacing that can be utilized for artificial pacing and heart failure development in preclinical studies.
10:04
Tractable In Vivo Reprogramming of Tumor Cells to Type 1 Conventional Dendritic Cell-like Cells
0 Views •
2025
This protocol describes the in vivo reprogramming of mouse cancer cells into type 1 dendritic-like cells within the tumor microenvironment through enforced expression of the transcription factors PU.1, IRF8, and BATF3.
FAQs
The electrical cycle begins with gradual spontaneous depolarization, meaning the membrane voltage rises progressively rather than remaining stable between impulses. Once threshold is reached, calcium-dependent action potentials are triggered. This sequence allows the sinoatrial node to initiate rhythmic activity and provides the electrical timing signal that coordinates subsequent cardiac contractions.
Pacemaker cells can progress toward threshold through their own intrinsic membrane activity, whereas some excitable cells depend on an incoming signal from another cell to initiate activation. This distinction makes pacemaker activity especially important for establishing rhythm: the cells can provide a recurring electrical source that organizes activity across connected cardiac tissue.
Calcium currents are central when gradual depolarization reaches threshold because they generate the action potential associated with pacemaker activation. Potassium currents contribute afterward by helping reset the membrane potential. The opposing phases create a repeating electrical cycle, allowing pacemaker cells to recover and participate in continued rhythmic impulse generation.
After the sinoatrial node generates an impulse, the signal spreads through cardiac tissue. This propagation links the activity of individual cells to the larger sequence of heart contraction, helping establish both the rate and timing of cardiac activity. Pacemaker cells therefore contribute not only to impulse generation but also to coordinated tissue-level behavior.
Their intrinsic electrical behavior offers a cellular model for examining how rhythmic cardiac activity emerges and becomes coordinated. Studying these cells can support research on cardiac development, where electrical organization is relevant, and on arrhythmias, in which abnormal rhythm or timing may be investigated in relation to pacemaker activity and impulse propagation.
Pacemaker cell research connects cellular ion-channel activity with clinical approaches for regulating cardiac rhythm. Understanding how spontaneous depolarization, calcium-dependent activation, and potassium-mediated resetting produce repeated impulses helps frame why external pacing may be relevant when natural rhythm control is inadequate. This relationship links basic biology to treatments such as implanted pacemakers.