A dissolving microneedle patch helps damaged hearts repair themselves after a heart attack. Credit: Shutterstock
A new microneedle patch delivers IL-4 directly into damaged heart tissue, helping the heart rebuild after a heart attack.
The treatment encourages immune cells to switch into a healing mode while improving communication between cells that control blood flow and repair.
New Microneedle Patch Designed to Help the Heart Recover
A research group led by Dr. Ke Huang at Texas A&M University has created a patch that may support heart healing after a heart attack. The device uses a specialized microneedle system to deliver a therapeutic molecule straight into damaged heart tissue, which helps promote repair and improves overall heart function while minimizing effects on the rest of the body.
Each microneedle in the biodegradable patch contains tiny particles filled with interleukin-4 (IL-4), a molecule that plays an important role in regulating the immune system. Once the patch is placed on the heart, the needles dissolve and release IL-4 directly into the injured region, creating conditions that encourage the tissue to recover.
Huang and his collaborators reported their results in Cell Biomaterials, with support from the National Institutes of Health and the American Heart Association.
“This patch acts like a bridge,” said Huang, assistant professor in the Department of Pharmaceutical Sciences. “The microneedles penetrate the outer layer of the heart and allow the drug to reach the damaged muscle underneath, which is normally very hard to access.”
How a Heart Attack Damages Tissue
When a heart attack occurs, blood flow to parts of the heart is cut off. Cells in the affected area lose oxygen and nutrients and begin to die. The body responds by creating scar tissue to stabilize the heart, but this scarred area cannot contract like healthy muscle. Over time, the remaining muscle must work harder, which can eventually lead to heart failure.
Huang’s patch is designed to interrupt this progression. By delivering IL-4 directly to the site of injury, the treatment encourages immune cells known as macrophages to shift from a pro-inflammatory mode into a state that supports healing. This change helps limit scarring and improves the long-term outlook for the heart.
“Macrophages are the key,” Huang explained. “They can either make inflammation worse or help the heart heal. IL-4 helps turn them into helpers.”
Why Local Delivery of IL-4 Matters
Earlier efforts to use IL-4 for heart repair relied on injecting it into the bloodstream, but that approach caused unwanted effects in other organs. The new patch avoids this issue by keeping IL-4 focused on the damaged area rather than spreading it throughout the body.
“Systemic delivery affects the whole body,” he said. “We wanted to target just the heart.”
Unexpected Cellular Responses Support Healing
One of the most notable discoveries from the study was a shift in how heart muscle cells behaved after treatment. According to Huang, these cells became more responsive to nearby signals, especially those coming from endothelial cells, which line blood vessels. This improved communication appears to play a meaningful role in long-term recovery. “The cardiomyocytes weren’t just surviving, they were interacting with other cells in ways that support recovery,” he said.
The team also found that the patch reduced damaging inflammatory signals coming from endothelial cells. In addition, they observed stronger activity in a signaling pathway called NPR1, which helps maintain blood vessel health and supports overall heart function.
Next Steps Toward Clinical Use
Right now, applying the patch requires open-chest surgery. Huang hopes to create a version that can be delivered through a small tube, which would make the treatment far easier to use in real-life medical settings.
“This is just the beginning,” he said. “We’ve proven the concept. Now we want to optimize the design and delivery.”
Reference: “Immunomodulatory microneedle patch for cardiac repair in rodent and porcine models of myocardial infarction” by Ke Huang, Dashuai Zhu, Jennifer Soto, Shiqi Hu, Jun Fang, Joyce Huang, Xuexiang Zhang, Junlang Li, Yuan Li, Panagiotis Tasoudis, Shuo Liu, Xuan Mei, Tyler Hoffman, Thomas G. Caranasos, Cunjiang Yu, Zhen Gu, Song Li and Ke Cheng, 23 July 2025, Cell Biomaterials.
DOI: 10.1016/j.celbio.2025.100152
Huang is collaborating with Xiaoqing (Jade) Wang, assistant professor of statistics in the College of Arts and Sciences, to develop an AI model aimed at mapping immune responses and guiding future immunomodulatory therapeutic delivery.
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