How Cells Clean Up Dead Neighbors — and What It Could Mean for Chronic Inflammation - Scitke

Reading time: 4 minutes

A living zebrafish embryo showing actin, a structure inside cells that helps them keep their shape and move, in cyan. Dead cells that have been taken in by other cells are shown in red. Even while cells remove dead material, the embryo’s outer layer stays closed and intact.
Credit: Laura F. Bianchi/Centro de Regulación Genómica — A living zebrafish embryo showing actin, a structure inside cells that helps them keep their shape and move, in cyan. Dead cells that have been taken in by other cells are shown in red. Even while cells remove dead material, the embryo’s outer layer stays closed and intact.
**Credit:** Laura F. Bianchi/Centro de Regulación Genómica

Our bodies are constantly repairing and renewing themselves. Every day, cells become damaged, age, or die and need to be removed. It may sound like a simple housekeeping job, but researchers are discovering that this process is surprisingly complex. A new study has revealed how cells in protective tissues can remove dying cells while keeping the surrounding tissue sealed. The discovery could eventually help scientists better understand what happens when this cleanup system fails — including its possible connection to chronic inflammation.

A Microscopic Cleanup Operation

Many parts of the body are covered by layers of cells known as epithelial cells. They form protective surfaces in places such as the skin, intestines and airways. These cells have two important jobs. They must stay tightly connected to create a protective barrier, while also dealing with cells that die nearby. Researchers from the Center for Genomic Regulation (CRG) in Barcelona studied this process using developing zebrafish and mouse embryos. They discovered that epithelial cells can essentially reuse part of their normal “cellular glue” to help remove dying cells. One of the key proteins involved is called E-cadherin.

The Surprising role of E-cadherin

E-cadherin is normally known for helping neighboring cells stick together. Think of it as part of the molecular structure that keeps a sheet of cells connected. But the researchers found that this machinery can take on another role. When a nearby cell dies, the surrounding epithelial cell can use the E-cadherin system to help grab and engulf it. Importantly, the dying cell itself does not need to provide E-cadherin for the process to happen. Experiments showed that the E-cadherin machinery inside the healthy surrounding tissue appears to be responsible for helping the cell physically surround and remove the dead material. This gives scientists a new view of how cells cooperate to maintain healthy tissues.

How do Cells Remove something without Breaking the Barrier?

There is a difficult problem here. Epithelial cells are packed tightly together, forming a protective layer. But when one cell needs to swallow another cell, it has to change its shape significantly. Researchers discovered that different parts of the epithelial cell appear to perform different jobs. The lower part of the cell changes shape and stretches around the dying cell, helping pull it inward. Meanwhile, the upper surface remains relatively stable, helping preserve the protective barrier. In simple terms, the cell manages to clean up its neighbor without leaving a hole in the tissue. The scientists also found that the process depends on carefully controlled mechanical forces. Some proteins help connect the E-cadherin system to the cell’s internal skeleton, allowing the cell to generate the force needed to engulf the dying cell. Too little force is a problem — but too much can also interfere with the cleanup process.

What does this have to do with Inflammation?

This is where the discovery becomes particularly interesting. When cells die, they need to be removed efficiently. If dead cells remain in tissues for too long, they can eventually break apart and release their contents. That can contribute to inflammatory responses. The researchers therefore suggest that understanding how tissues safely remove dying cells could provide new clues about conditions involving persistent inflammation. However, it is important to note that the study does not show that this mechanism causes or cures chronic inflammatory diseases. The experiments were performed in developing zebrafish and mouse embryos. Whether exactly the same process operates in adult animals or human tissues remains an open question.

Why this discovery matters

The study highlights an important principle in biology: keeping the body healthy is not only about fighting harmful organisms or repairing damaged cells. It is also about efficiently managing cells that are no longer needed. Researchers already know that epithelial tissues in several parts of the body can remove dying cells. E-cadherin is also widely found in epithelial tissues across different species. The new findings provide a more detailed picture of the physical process behind this cellular cleanup. The research was published in Nature Communications on August 27, 2026, and was led by researchers at the Center for Genomic Regulation in Barcelona.

A tiny process with potentially big implications

Inside our bodies, millions of microscopic events happen every moment without us noticing. A cell dies, another cell responds, and the surrounding tissue adjusts — all while maintaining the protective barriers that keep our organs functioning. Scientists are now learning that this seemingly ordinary cleanup process involves sophisticated molecular machinery and carefully balanced forces. The next question is whether similar mechanisms operate in adult human tissues. If future research confirms that they do, this cellular “cleanup crew” could provide scientists with another piece of the puzzle for understanding how tissues maintain themselves — and why problems with cellular cleanup may be relevant to chronic inflammation. For now, the discovery is an important step toward understanding one of the body’s most fundamental maintenance systems: removing what is no longer needed while keeping everything else intact.