Tiny control zones in the heart's natural pacemaker and how they change with pressure
Official title: Functional Microdomains in the Heart's Pacemaker: A New Dimension of Cardiac Remodeling
Funded at University of Wisconsin-Madison · NIH-11248012 · Data updated 2026-11-12
This work looks at how small regions inside the heart's natural pacemaker respond to long-term pressure so it can help people who develop sick sinus syndrome and slow or irregular heartbeats.
Quick facts
| Grant type | R01 grant |
|---|---|
| Study type | NIH-funded research |
| Funding institution | University of Wisconsin-Madison NIH-funded |
| Lab location | 1 site (Madison, United States) |
| Project start | March 1, 2018 |
| Project end | December 31, 2028 |
| Funding year | 2026 |
| Award (this year) | $601,827 |
| NIH project number | 5R01HL141214-08 |
| Project ID | NIH-11248012 on NIH RePORTER |
Who could benefit from this research
✓Could help
People with long-standing high blood pressure or symptoms of sick sinus syndrome (such as unexplained slow heart rate, fainting, dizziness, or long pauses in heartbeat) would be most relevant to this work.
✕Less likely to help
Patients whose rhythm problems are caused by unrelated issues like isolated valve disease or non-cardiac causes may not directly benefit from these findings.
What this research studies
Scientists will examine the sinoatrial node (the heart's natural pacemaker) using advanced imaging to see how its tiny structural zones change when the heart is under chronic mechanical load. They will image cell structure, track calcium and cAMP chemical signals, record electrical activity, and run biochemical tests to link those changes to pacemaker dysfunction. Much of the work will model conditions like high blood pressure that stretch the heart and can lead to sick sinus syndrome. The goal is to map the steps from mechanical stress to altered signaling and rhythm problems so new prevention or treatment ideas can emerge.
Why it matters
Potential benefit: If successful, this could point to ways to prevent or treat sick sinus syndrome and reduce episodes of dangerously slow or irregular heartbeats.
How similar studies have gone: Previous animal and cell studies show mechanical stretch affects pacemaker cells, but applying high-resolution imaging of microdomains in the sinoatrial node to explain remodeling and sick sinus syndrome is a newer approach.
Where this research is happening
-
University of Wisconsin-Madison
Madison, United States Active
Researchers
- Principal investigator: Glukhov, Alexey V — University of Wisconsin-Madison
- Study coordinator: Glukhov, Alexey V
Related research
Other NIH-funded projects on the same topics.
-
Time-dependent membrane proteins in circadian brain cells
A research project will map how membrane proteins in brain clock neurons change over time and may reveal targets to support healthy sleep, metabolism, and behavior.
-
Understanding how human heart pacemaker cells develop
Scientists are studying how the human heart’s natural pacemaker forms, which could lead to better treatments for rhythm problems.
-
Understanding how specialized heart pacemaker cells drive rhythm and dysfunction
This NIH grant explores how distinct heart pacemaker cell subtypes contribute to normal rhythm and sinus node dysfunction, with the goal of guiding better treatments for heart rhythm problems.
-
Biopacemakers for aging hearts using stem-cell pacemaker cells
Aims to help older patients with a faulty heart rhythm by using lab-made pacemaker cells grown from patients’ own stem cells.
-
Magnesium transporter and heart pacemaker: a primate model of arrhythmias
A physician-scientist at Stanford is studying how a magnesium transporter affects the heart's natural pacemaker rhythm in primate-like models to better understand human arrhythmias.
-
How heart pacemakers sense stretch and speed up
A study at the University of Washington will explore how PIEZO channels in the heart’s pacemaker help the heart beat faster when the heart experiences stretch.
About this research
- This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
- Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
- For full project details, budget, and progress reports, visit the official NIH RePORTER page.