Functional Studies in Primary Cardiomyocytes
Primary cardiomyocytes retain some biological features of their source tissue and can be used to investigate drug effects on cardiac electrical activity, calcium handling and contraction. We combine cell isolation and culture with functional assays to support studies of pharmacological responses, functional abnormalities and mechanisms of action.
This service focuses on primary cardiomyocytes isolated from rodent heart tissue. Neonatal and adult cardiomyocytes differ in morphology, adaptation to culture and functional properties. The source, isolation method, culture duration and intended endpoints guide the selection of single-cell recordings, cell populations or an appropriate culture system. Species, recording temperature and pacing conditions are documented for comparisons; findings are not treated as interchangeable with those from human iPSC-derived cardiomyocytes or intact human cardiac tissue.
Functional Assay Capabilities
| Assay | Evaluation scope |
|---|---|
| Patch-clamp action potentials | Record membrane potential and analyze action potential duration, waveform and abnormal electrical activity. |
| Calcium imaging | Analyze calcium transient amplitude, kinetics and rhythm, together with spatial propagation in suitable preparations. |
| Voltage imaging | Observe optical electrical activity to assess repolarization, rhythm and spatial activity patterns. |
| Contractile function | Quantify contraction and relaxation, selecting motion-based or mechanical endpoints according to sample suitability. |
| Electrical-calcium-contraction coupling | Analyze electrical activity, calcium handling and contraction together to investigate where functional changes arise. |
The recording site, culture format and analysis parameters are selected for the primary cardiomyocyte preparation and study objectives. Joint analysis does not imply simultaneous acquisition of all signals in every preparation.
Manual Patch-Clamp Electrophysiology
Current clamp directly records single-cell action potentials, while voltage clamp supports measurement of cardiac ionic currents and their kinetics. Depending on recording quality, endpoints include duration at defined repolarization levels, waveform amplitude, resting or maximum diastolic potential, excitability, rhythm variability and cell-to-cell variability. Abnormal events require predefined criteria and trace review; a change in one parameter alone does not establish a mechanism.
Research Applications
- Compare action potentials, calcium transients and contractile phenotypes before and after treatment.
- Investigate relationships between excitability, altered calcium handling and changes in contractile function.
- Examine functional recovery or persistent changes after different exposure durations.
- Study cardiac ion-channel mechanisms, functionally assess targets or genetic models, and characterize compound-induced electrical responses.
For preparations that form suitable adherent cultures, compatibility with field-potential and impedance assays can be assessed. Impedance-based beating signals and direct measurements of contractile force must be interpreted separately. Likewise, motion-derived contraction measurements are not automatically direct force measurements.
Study Design and Deliverables
The model, treatment concentrations, exposure times, controls and replication are agreed according to the research question. Results are analyzed alongside sample condition and quality-control information. Patch-clamp checks include seal and access resistance, membrane stability and protocol suitability, with cell-level and preparation-level replication distinguished.
- Records of model source, culture conditions and sample quality.
- Representative recordings, quantitative results and statistical analysis for the agreed functional endpoints.
- Interpretation in the context of cell condition and recommendations for further investigation.
