MIT engineers have developed a method to control blood vessel growth using mechanical stretching, advancing tissue engineering by enabling precise vascular patterning. The technique, involving a blood vessel on a chip
and magnetic actuation, reveals how physical forces influence angiogenesis, with implications for regenerative medicine and implantable tissues.
Researchers at the Massachusetts Institute of Technology (MIT) have made a breakthrough in tissue engineering by demonstrating how mechanical stretching can control blood vessel growth, a critical step toward creating functional, implantable organs. The team developed a microscale blood vessel on a chip
model, where human endothelial cells were embedded in a gel with a magnet. By applying controlled magnetic forces, they stretched the gel, triggering the growth of capillaries in predictable patterns.
Mechanical Stretching Drives Vascular Growth
The MIT team’s experiments revealed that mechanical forces directly influence angiogenesis—the formation of new blood vessels. When the gel containing the central artery was stretched by 5% of its width, it produced the highest number of capillaries. Stretching by 15% resulted in fewer but longer vessels, while altering the direction of stretching guided the growth of capillaries in specific patterns. The main takeaway is: stretching the blood vessel back and forth seems to enhance the number of new capillaries that grow,
said Ritu Raman, Associate Professor of Mechanical Engineering at MIT and the study’s co-lead author.
The researchers used a magnetically controlled system to simulate mechanical forces. By moving an external magnet, they induced cyclic stretching of the gel, mimicking the physical stresses that occur in living tissues. This approach allowed them to bypass traditional chemical-based methods, which often fail to produce organized vascular networks. Healthy tissues depend on organised blood vessel networks, but state-of-the-art protocols don’t enable fabricating such networks within engineered tissues,
Raman noted.
Piezo1 Gene Links Mechanical Forces to Vascular Growth
The study also uncovered a biological mechanism connecting mechanical forces to blood vessel formation. The team identified the PIEZO1 gene, which regulates ion channels that respond to physical pressure, as a key player. When endothelial cells had their PIEZO1 gene suppressed, mechanical stretching failed to stimulate capillary growth. This suggested that activation of PIEZO1 is a key part of the biological process linking physical forces to blood vessel growth. Mechanical forces play an important role in our bodies and that means that if you want to grow more or less vessels, or shorter or longer vessels, or vessels in certain directions, we now know how to do that,
Raman explained.
The discovery builds on research by Ardem Patapoutian, who won the 2021 Nobel Prize for his discovery of ion channels in cell membranes that open and close in response to mechanical pressure. Raman showed Patapoutian her group’s experimental results, and Patapoutian in turn proposed that the explanation could be the PIEZO1 channel.
Broader Implications for Regenerative Medicine
The technique’s potential extends beyond basic research. By enabling precise control over vascular networks, the method could improve the viability of engineered organs and tissues. The team plans to apply the protocol to create vascular systems for implantable tissues, addressing a major hurdle in organ regeneration.
The research also intersects with broader studies on mechanical forces in biology. In a separate study, Raman and colleagues found that exercise stimulates nerve growth not only through biochemical signals but also via physical stretching of neurons. When neurons were mechanically stretched, they grew as much as those exposed to muscle-derived myokines. We’re finding that moving is good, which is always the takeaway of everything we do in our lab,
Raman said.
Challenges and Next Steps
While the results are promising, several challenges remain. The team must scale the technique for larger tissues and ensure long-term stability of engineered vascular networks. Additionally, translating the method to in vivo settings will require further research.
Future work will explore how mechanical forces can be tailored to specific tissues. For example, the team is investigating whether controlled stretching can enhance blood vessel growth in muscle grafts, potentially aiding recovery from injuries. The ability to program blood vessel growth with physical cues may enable reproducible and scalable fabrication of engineered tissues that can be implanted in the body to restore function after debilitating disease or injury,
Raman said.
A New Era in Tissue Engineering
The MIT team’s work represents a shift from chemical to mechanical approaches in tissue engineering. By harnessing physical forces, scientists can now design vascular systems with greater precision, opening new avenues for treating diseases and injuries. As Raman noted, The main takeaway is: stretching the blood vessel back and forth seems to enhance the number of new capillaries that grow.
Combining engineering, biology, and mechanics, the study highlights how physical cues can guide cellular behavior—a principle with far-reaching implications for medicine and biotechnology.
