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Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
Published on: February 17, 2015
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Chemically defined and small molecules-based generation of sinoatrial node-like cells
Xiaojie Hou1,2,3, Shuhong Ma4, Wei Fan1,2,3
1Department of Cardiovascular Surgery, Affiliated Hospital of Southwest Medical University, Luzhou, 646000, China.
Stem Cell Research & Therapy
|April 12, 2022
Summary
We developed a chemically defined method to generate sinoatrial node-like cells (SANLCs) from human pluripotent stem cells (hPSCs). This optimized protocol enhances SANLC differentiation efficiency and provides a platform for cardiac research and therapeutic development.
Area of Science:
- Stem cell biology
- Cardiovascular research
- Developmental biology
Background:
- Current methods for differentiating human pluripotent stem cells (hPSCs) into sinoatrial node-like cells (SANLCs) rely on complex, undefined media components.
- This complexity impedes understanding of cardiac subtype specification and limits translational applications of SANLCs.
Purpose of the Study:
- To establish an optimized, chemically defined protocol for the efficient and stable generation of SANLCs from hPSCs.
- To investigate the roles of WNT, retinoid acid (RA), and fibroblast growth factor (FGF) signaling in SANLC differentiation.
Main Methods:
- Temporal modulation of WNT/β-catenin signaling using GSK3 inhibitor and WNT inhibitor to induce pan-cardiomyocytes.
- Manipulation of WNT, RA, and FGF signaling during the cardiac mesoderm stage.
- Metabolic selection utilizing lactate metabolism and glucose starvation for SANLC enrichment.
- Validation using RT-PCR, immunofluorescence, flow cytometry, and whole-cell patch clamp.
Main Results:
- WNT, RA, and FGF signaling modulate hPSC differentiation into SANLCs in a concentration- and time-dependent manner.
- Synergistic modulation of these pathways improved SANLC differentiation efficiency up to 45%.
- Metabolic purification further enriched SANLCs to approximately 50%, with electrophysiological data confirming pacemaker cell characteristics.
Conclusions:
- An optimized, chemically defined protocol for SANLC generation using combined signaling pathway modulation and metabolic selection has been developed.
- This method offers a valuable platform for disease modeling, drug discovery, predictive toxicology, and the construction of biological pacemakers.
