Original title: Optical microelectrode arrays for differential readout of electrical and mechanical signals in cardiac cells
Alessandro Leronni, Rosalia Moreddu · September 2026
Heart cells need to send electrical signals and squeeze physically to pump blood. Usually, scientists must use invasive tools or separate tests to track both events. Researchers solved this by using tiny optical microelectrodes, which are light-based sensors. When a heart cell fires an electrical spark, it shifts electrical charges inside the sensor. The sensor turns this charge shift into a flash of light. At the same time, the physical squeeze moves the cell membrane, adding a motion signal to the light. The team recorded beating cells and then blocked their contraction to test them again. Comparing the two tests let them easily split the electrical signal from the physical movement in a label-free way to screen drugs safely.
Imagine trying to tell if a dancer is following the music or just moving on her own. Normally you would need two separate recordings: one of the music and one of the dancer. But suppose you could watch the dancer's movements and also see the music's effect reflected in her timing from the same video. Here, the optical microelectrode acts like that single video: it picks up both the electrical signal (the music) and the mechanical contraction (the dancer's movement) from the same cell. By blocking the contraction, researchers can see the electrical part alone.
This matters because current methods require separate or invasive techniques to measure a heart cell's electrical and mechanical activity. This approach combines both into one non-invasive optical readout. It could make drug safety screening for heart side effects faster and more accurate, without damaging the cells.
The abstract doesn't explicitly state limitations, but the method relies on chemically inhibiting contraction to separate signals, which may affect cell health. It is demonstrated in vitro, so applicability in vivo is not shown. The optical readout may also be sensitive to other mechanical perturbations beyond contraction, which are not addressed.
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Optical microelectrode arrays for differential readout of electrical and mechanical signals in cardiac cells — Alessandro Leronni, Rosalia Moreddu
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.