MIT Engineers Develop 'Mini Livers' for Injection

The engineered tissue grafts could provide a lifeline for thousands on liver transplant waitlists.

Published on Mar. 4, 2026

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Scientists from the Massachusetts Institute of Technology (MIT) have created "mini livers" that can be injected into the body to help take over the functions of a failing liver. The tissue grafts, made up of hepatocytes and other supportive cells embedded in hydrogel microspheres, have the potential to help the thousands of Americans with chronic liver disease currently waiting for a transplant amid a shortage of donor organs.

Why it matters

Liver disease is a major health issue, with over 10,000 Americans on transplant waitlists. This injectable tissue graft technology could provide an alternative to surgical transplants, serving as a bridge to transplantation or supporting patients ineligible for surgery due to poor health.

The details

The researchers embedded hepatocytes, the key liver cells, into hydrogel microspheres that can be injected. The microspheres help the cells integrate with the body, forming connections to blood vessels. Adding fibroblasts, a supportive cell type, further improved the hepatocytes' survival and growth. The team used ultrasound to guide the injections and monitor the grafts, which remained functional for the full 8-week study period.

  • The research was published on March 4, 2026.

The players

Sangeeta Bhatia

A biomedical engineering professor at MIT and a co-author of the study.

Vardhman Kumar

A biological engineer and co-author of the study.

Massachusetts Institute of Technology (MIT)

The university where the research was conducted.

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What they’re saying

“We think of these as satellite livers. If we could deliver these cells into the body while leaving the sick organ in place, that would provide booster function.”

— Sangeeta Bhatia, Biomedical engineering professor (Newsweek)

“What we did is use this technology to create an engineered niche for cell transplantation. If the cells are injected in the absence of these spheres, they would not integrate efficiently with the host, but these microspheres provide the hepatocytes with a niche where they can stay localized and become connected to the host circulation much faster.”

— Vardhman Kumar, Biological engineer (Newsweek)

What’s next

The researchers plan to continue testing the mini liver grafts in animal models and work towards clinical trials to evaluate their safety and efficacy in humans.

The takeaway

This injectable tissue graft technology represents a promising alternative to traditional liver transplants, with the potential to help thousands of Americans awaiting donor organs or ineligible for surgery. Further development could lead to a new lifeline for those suffering from chronic liver disease.