System and method for monitoring cardiomyocyte beating, viability and morphology and for screening for pharmacological agents which may induce cardiotoxicity or modulate cardiomyocyte function
Devices and methods for performing extracellular recording of cells, such as excitable cells, cardiomyocytes, and cardiomyocyte precursor cells is provided. An exemplary device includes a nonconductive substrate forming or provided as a base of one or more wells; a recording electrode positioned on the substrate within the well, wherein the recording electrode is accessible to cells when a cell sample is added to the device; and a reference electrode positioned within the well in a cell-free zone, the cell-free zone characterized as free from contact with cells when the cell sample is added to the device, thereby preventing contact between cells and the reference electrode.
1. A system for parallel impedance monitoring and extracellular field potential recording of cells, the system comprising:
a) a device comprising:
i) a nonconductive substrate forming a base of one or more wells,
ii) a set of at least two impedance electrodes capable of monitoring cell-substrate impedance of cells, the at least two impedance electrodes positioned on the nonconductive substrate within the one or more wells configured for cell-substrate impedance monitoring at 10 millisecond resolution,
iii) a set of extracellular recording electrodes positioned on the substrate within the one or more wells and configured for extracellular field recording of the cells, wherein the set of at least two impedance electrodes and the set of extracellular recording electrodes are different sets of electrodes, further wherein all of the electrodes are on a same surface;
b) an impedance analyzer for measuring cell-substrate impedance at 10 millisecond resolution;
c) an extracellular field potential amplifier for extracellular field potential recording; and
d) a switch that switches the one or more wells between measuring impedance and extracellular field potential recording modes.
2. The system according to claim 1 , wherein the at least two impedance electrodes are interdigitated electrodes.
3. The system according to claim 2 , wherein each of the at least two impedance electrodes comprises an electrode structure comprising a plurality of electrode elements, wherein the electrode elements of different electrode structure are interdigitated.
4. The system according to claim 2 , wherein the at least two impedance electrodes and set of extracellular recording electrodes share a same electrode.
5. The system according to claim 1 , wherein the at least two impedance electrodes and set of extracellular recording electrodes share a same electrode.
6. The system according to claim 1 , wherein impedance may be monitored for cells positioned at either of the at least two impedance electrodes, further wherein one of the at least two impedance electrodes is configured as a reference electrode in the set of extracellular recording electrodes.
7. A method of extracellular field potential recording and impedance monitoring of a cell population, the method comprising:
a) providing the system according to claim 1 ;
b) adding a cell sample to the device;
c) performing extracellular field potential recording measurements of the cell sample by amplifying the voltage signals between the set of extracellular recording electrodes and monitoring the amplified signals; and
d) performing impedance measurements by monitoring cell-substrate impedance between the two impedance electrodes at 10 millisecond resolution.
8. The method according to claim 7 , wherein the cells comprise cardiomyocytes or cardiomyocyte precursor cells, the method further comprising adding a compound suspected of affecting a beating cycle of the cells.
9. The method according to claim 8 , further comprising resolving polarization and depolarization of beating cells.
10. The method according to claim 8 , further comprising determining whether or not the compound affects cell beating.
11. The method according to claim 9 , further comprising resolving a beating cycle of the cells from the impedance measurements.
12. The method according to claim 9 , further comprising determining a beating rate from the impedance measurements.
13. The method according to claim 9 , further comprising determining a beating amplitude from the impedance measurements.
14. The method according to claim 9 , wherein the step of performing impedance measurements is performed at 5 millisecond resolution.
15. The method according to claim 9 , wherein two consecutive impedance measurements are performed at 1 millisecond or faster.
16. The method according to claim 7 , further comprising calculating a cell index parameter from measured impedance values.
17. The method according to claim 7 , wherein the cells comprise cardiomyocytes or cardiomyocyte precursor cells, the method further comprising resolving a beating cycle of the cells from the impedance measurements.
18. The method according to claim 7 , wherein the cells comprise cardiomyocytes or cardiomyocyte precursor cells, the method further comprising determining a beating rate from the impedance measurements.
19. The method according to claim 7 , wherein the cells comprise cardiomyocytes or cardiomyocyte precursor cells, the method further comprising determining a beating amplitude from the impedance measurements.
20. The method according to claim 7 , wherein the step of performing impedance measurements is performed at 5 millisecond resolution.
21. The method according to claim 7 , wherein two consecutive impedance measurements are performed at 1 millisecond or faster.