Turns out, skin cells can actually send out slow electric signals after they get injured—kind of like how nerve cells communicate, but way slower. Scientists used to think only nerve cells could do that, so this was a huge surprise. These slow electrical pulses can travel about 500 micrometers—roughly the distance across 40 cells—and may be how injured cells alert their neighbors to prepare for wound healing.

To study this, researchers grew human skin cells and dog kidney cells (both types of epithelial cells, which line surfaces like skin and internal organs) on chips fitted with electrodes. Then, they used lasers to damage some of the cells and monitored electrical activity. That’s when they discovered the electric pulses—tiny voltage spikes triggered by the flow of calcium ions. Surprisingly, these pulses had voltages similar to nerve impulses but were much slower, taking one to two seconds to register compared to the milliseconds it takes for nerve cells to fire.

The slow pace almost caused them to miss the discovery. The software they were using was programmed to detect fast nerve-like signals and ignored anything slower than 500 milliseconds. Once the researchers lifted that filter, they found the signals were very real and consistent. Damaged cells continued to emit these electric pulses for over five hours, possibly to signal surrounding cells to get ready—by pushing out the injured ones and starting the repair process.

This finding gives new insight into the wound-healing timeline. While nerve signals handle quick reactions, these slow, sustained electrical messages may guide the longer healing phases that unfold over days or weeks. Scientists have known for over a century that wounds change the electric fields in tissues, but this is the first time they’ve seen epithelial cells themselves sending out electrical spikes like this.

It’s a game-changer for how we understand wound healing—not just chemicals and mechanical signals, but electrical communication too. Researchers say it’s time to stop underestimating the role of electricity in biology. Next, they plan to study how these signals work in 3D tissue models and how they interact with other cell types. Take Care Of Your Health at www.bovinebob.com