One of the biggest obstacles in tissue engineering has always been creating functional blood vessels. Scientists can now grow lab-made muscles, skin, and even miniature organs, but without a network of blood vessels to deliver oxygen and nutrients, these tissues cannot survive after transplantation. Researchers at the Massachusetts Institute of Technology (MIT) have now developed a new technique that could solve this long-standing challenge by precisely controlling how artificial blood vessels grow.
Using Gentle Movement to Guide Blood Vessel Growth
Instead of relying only on chemical signals, the MIT team discovered that gentle mechanical stretching can direct the formation of new blood vessels. They created a tiny “blood vessel on a chip” using human endothelial cells, the cells that naturally line blood vessels. The vessel was embedded inside a nutrient-rich gel containing a small magnet.
By moving an external magnet back and forth, the researchers gently stretched the artificial artery. This simple movement encouraged the artery to sprout new capillaries. Even more impressively, changing the direction and amount of stretching allowed the scientists to control where the new vessels formed, how many developed, and how long they became.
A Gene That Responds to Physical Force
The team also uncovered the biological mechanism behind this process. They found that a gene called PIEZO1, which produces a protein that senses mechanical force, plays a critical role in blood vessel formation. When the researchers suppressed the PIEZO1 gene, the stretched blood vessels produced far fewer new capillaries. This confirmed that physical forces activate the gene and trigger angiogenesis—the growth of new blood vessels.
A Step Closer to Lab-Grown Organs
The findings, published in the Proceedings of the National Academy of Sciences (PNAS), could significantly improve the future of regenerative medicine. Researchers may eventually use this technique to build organized vascular networks inside engineered muscles, organs, and other tissues before implantation. Such advances could make lab-grown organs more viable, reducing dependence on donor organs and improving treatments for patients with severe injuries or organ failure. While further research is needed before clinical use, the study offers a practical and highly controllable way to create the lifelines that artificial tissues need to survive.
