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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
Published on: October 23, 2016
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Deciphering cellular signals in adult mouse sinoatrial node cells
Gopireddy R Reddy1, Lu Ren2, Phung N Thai2
1Department of Pharmacology, University of California Davis, One Shields Avenue MED: PHARM Tupper 242, Davis, CA 95616, USA.
Iscience
|January 17, 2022
Summary
Researchers developed a method to culture mouse sinoatrial node (SAN) cells, enabling detailed study of cardiac pacemaker signaling. This technique reveals distinct signaling dynamics and changes in heart failure.
Area of Science:
- Cardiology
- Cell Biology
- Biophysics
Background:
- Sinoatrial node (SAN) cells function as the heart's natural pacemaker.
- Understanding SAN cell signaling is crucial for cardiac rhythm regulation.
- Existing methods for studying SAN cells in vitro have limitations.
Purpose of the Study:
- To establish a reliable method for culturing and manipulating adult mouse SAN cells.
- To investigate signaling pathways within SAN cells using Förster resonance energy transfer (FRET)-based biosensors.
- To explore differences in signaling in healthy versus heart failure conditions.
Main Methods:
- Adult mouse SAN cells were cultured using specific media additives (blebbistatin or (S)-nitro-blebbistatin).
- Cells were infected with FRET-based biosensors to monitor signaling molecules.
- Action potential (AP) waveforms and cAMP dynamics were measured.
- Signaling responses to various stimuli were analyzed.
Main Results:
- Cultured SAN cells maintained morphology, protein distribution, and AP waveform for over 40 hours.
- Distinct β-adrenergic-mediated cAMP pools were identified.
- Cyclic GMP (cGMP), protein kinase A (PKA), Ca2+/calmodulin-dependent protein kinase II (CaMKII), and protein kinase D (PKD) exhibited unique dynamics.
- Heart failure SAN cells displayed reduced cAMP and cGMP levels.
Conclusions:
- A robust method for maintaining adult mouse SAN cells in culture was developed.
- This method facilitates the study of intracellular signaling networks in SAN cells.
- The findings provide insights into signaling dysregulation in heart failure SAN cells.
