MIT Researchers Develop Blood Vessel-on-a-Chip to Guide Capillary Growth

Mechanical Stimulation as a Biological Cue

For years, laboratory-grown tissues have struggled to survive beyond a few hundred micrometers because they lacked the complex plumbing required to deliver oxygen and nutrients. While 3D printing can create larger vessels, the delicate, intricate networks of capillaries remain a significant challenge for traditional fabrication. Researchers at MIT have now turned to a dynamic solution: mechanical exercise.

The team created a microfluidic device, small enough to balance on a fingertip, that embeds a central “parent” vessel within a nutrient-rich gel. By using magnets to gently tug the gel back and forth, they discovered they could force the vessel to sprout new capillaries.

• 5 percent strain: Triggered a wave of new branching.
• 15 percent strain: Resulted in fewer total branches, but the vessels that did form grew significantly longer.

As Ritu Raman, the study’s co-lead author, noted, Mechanical forces play an important role in our bodies. 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.

For more on this story, see Osaka Researchers Generate Red Blood Cell-Like Cells From Canine iPSCs.

The Role of PIEZO1 Ion Channels

The discovery of how these vessels “feel” the stretch came from a chance encounter with Nobel laureate Ardem Patapoutian, who discovered PIEZO1 and PIEZO2—pressure-sensitive ion channels in cell membranes. Raman’s team hypothesized that the mechanical stretching was physically opening these channels, triggering a biological growth signal.

To verify this, the researchers genetically suppressed the PIEZO1 gene in endothelial cells. When they repeated the stretching experiment, the rate of capillary sprouting dropped significantly, confirming that the channel acts as a gatekeeper for vessel growth. The main takeaway is: Stretching the blood vessel back and forth seems to enhance the number of new capillaries that grow, Raman explained.

This follows our earlier report, I Tested My Blood for Microplastics. I Got a Number, but Few Answers..

Texas A&M University’s Customizable Vascular Models

While the MIT team focuses on the growth mechanics of vessels, researchers at TAMU are addressing the structural complexity of the vascular system. Led by Dr. Abhishek Jain, the lab has developed a vessel-chip system designed to replicate the irregular shapes found in human anatomy, such as aneurysms and stenotic regions.

“There are branched vessels, or aneurysms that have sudden expansion, and then stenosis that restricts the vessel. All these different types of vessels cause the blood flow pattern to be significantly changed, and the inside of the blood vessel is affected by the level of shear stress caused by these flow patterns.”

Read also: Columbia Study Links Serotonin Signaling to Mitral Valve Disease Progression.

Jennifer Lee, master’s student in biomedical engineering at Texas A&M

This approach allows for more realistic drug testing and disease modeling without relying on animal subjects.

Fluid Dynamics and Clinical Potential

Beyond structural design, engineers are tackling the fluid dynamics of blood itself. Research conducted by the MBL group in Australia demonstrated that friction and force generated by blood flow significantly influence platelet movement and clotting. In high-stress areas of their artery-on-a-chip models, they observed 7 to 10 times more platelet activity.

These combined advancements—MIT’s programmable growth and Texas A&M’s structural modeling—represent a shift toward patient-specific medicine. By moving away from simplified, straight-tube models, scientists are gaining the ability to tailor vascular platforms to individual patient biology.