🔬 Reproducing the human body's environment in the laboratory

Our cells are constantly being pushed, stretched, and compressed without our awareness: a play of invisible forces that influences their behavior. A study published in the journal Lab on a Chip proposes a precise and controllable method for reproducing this behavior in the laboratory.

In our bodies, cells do not live in isolation. They are surrounded by an environment called the extracellular matrix, a kind of network composed of proteins and sugars. This structure supports cells and also transmits mechanical constraints to them. These forces influence essential functions such as growth, healing, or even the onset of certain diseases.


To study these phenomena, researchers have designed tiny hydrogel structures. These particular materials resemble gels capable of changing shape when they receive a signal, such as light or a temperature variation. By integrating them into a lab-on-a-chip, scientists can create a controlled environment and precisely observe how cells react.

When these microstructures contract or dilate, they exert forces on the surrounding biological tissues. This makes it possible to reproduce, on a very small scale, the mechanical constraints that cells experience in the body. One of the strengths of this technique is its precision; scientists can control both the location and the timing of the applied forces. By tracking tiny fluorescent beads, they can even measure how these forces propagate through tissues.

Thanks to this device, researchers can work with three-dimensional models, which are closer to reality than traditional cell cultures. For example, they can simulate tumor tissues or observe blood vessel formation under realistic conditions. The hydrogels used are composed of polymers capable of retaining water; they can swell or contract depending on conditions. This property makes them useful for mimicking the movements and pressures present in living tissues.

The extracellular matrix plays a key role in certain pathologies. If it becomes too rigid or, conversely, too fragile, it can disrupt cell behavior. This can promote diseases such as cancer or fibrosis. By reproducing these constraints in the laboratory, researchers hope to identify anomalies more precisely and improve diagnostics, or even design new therapeutic approaches.