Harvard Scientists Convert Pancreatic Ductal Cells Into Insulin Producers in Mice

September 27, 2026 at 02:00 PM1 min

This digest was compiled by AI from multiple sources — links to the originals are below.

Harvard Medical School researchers genetically altered pancreatic ductal cells to produce insulin in response to high blood sugar. Transplanted into diabetic mice, the cells secreted human insulin and lowered glucose to near-normal levels for six weeks. The study appears in Science Translational Medicine.

Key Facts

Silencing the gene ALDH3B2 raised the rate of ductal cells converting to beta-like cells from under 1% to about 8.5%.
Transplanted engineered cells produced human insulin in diabetic mice and kept glucose near normal for six weeks.
The study was led by Jian Li, a postdoctoral researcher at Harvard Medical School, and published in Science Translational Medicine.
A human pancreas contains about a billion beta cells, which are missing or dysfunctional in people with diabetes.

Genetic Screen Discovery

Researchers used a genome-wide genetic screen to identify genes controlling ductal cell conversion. They found that removing ALDH3B2 increased the conversion of ductal cells into beta-like cells. Without the alteration, fewer than 1% of ductal cells spontaneously became beta-like; with ALDH3B2 silenced, the proportion rose to about 8.5%.

Mouse Transplant Results

The engineered human cells were transplanted into mice with diabetes. Human insulin began circulating in the mice, and their glucose levels dropped to near-normal. These effects persisted for six weeks.

Therapeutic Context

A clinical trial launched earlier this year is equipping muscle cells with genetic instructions to make insulin. Other emerging treatments generate insulin-producing cells in the lab for transplantation, but risk immune activation. The new approach harnesses existing pancreatic cells by turning off genetic switches that maintain their identity. A key hurdle is ensuring only target cells are edited, since ALDH3B2 is used by many cell types.