Harmine Plus GLP-1 Drug Safely Grows Human Beta Cells in Living Mice | Research

The takeaway

Combining harmine (a DYRK1A inhibitor) with exendin-4 (a GLP-1 drug) safely expanded human beta cell mass in a mouse transplant model.

No current drug grows beta cells
Among all diabetes medications in use, none actually increases the number of insulin-producing beta cells — this combination may be the first

What the researchers found

Harmine plus exendin-4 combination therapy safely increased human beta cell mass in vivo in a mouse xenograft system without causing harmful proliferation.

Why it matters

537 million people worldwide have diabetes, and beta cell loss is a core problem. A drug combination that safely expands beta cells could fundamentally change diabetes treatment.

The numbers in context

537 million people globally have diabetes. No current diabetes drugs increase beta cell numbers. The combination used harmine (DYRK1A inhibitor) and exendin-4 (GLP-1R agonist).

How the study worked

In vivo mouse xenograft study using transplanted human beta cells, testing harmine (DYRK1A inhibitor) combined with exendin-4 (GLP-1R agonist).

Who was studied

Mouse xenograft model with transplanted human beta cells

What this study cannot tell us

This was done in mice with transplanted human cells, not in human patients. Safety and efficacy in humans remain to be demonstrated.

How to read the evidence

Rated moderate: in vivo demonstration using human cells in mice, stronger than cell culture alone, but still requires human clinical testing.

When this study was published

Published in 2024. Represents a significant advance in the quest to restore beta cell mass in diabetes.

The bigger picture

Beta cell loss is a core problem in both type 1 and type 2 diabetes. If a drug combination can safely regrow beta cells, it could fundamentally change diabetes from a managed disease to a potentially reversible one.

Questions still open

Would this combination work without transplanting cells first?
Is the beta cell expansion durable after stopping treatment?

Common questions

Can we grow new insulin-producing cells?

This study shows a drug combination (harmine + GLP-1 drug) can safely expand human beta cells in mice — a first step toward potentially restoring insulin production.

Why is beta cell growth important?

Both type 1 and type 2 diabetes involve loss of beta cells. If we could regrow them, we might be able to restore natural insulin production.

Read the original research

Harmine and exendin-4 combination therapy safely expands human β cell mass in vivo in a mouse xenograft system.

Science translational medicine, 16(755), eadg3456

View on PubMed ↗Publisher’s paper ↗

Citation

Rosselot, Carolina; Li, Yansui; Wang, Peng; Alvarsson, Alexandra; Beliard, Kara; Lu, Geming; Kang, Randy; Li, Rosemary; Liu, Hongtao; Gillespie, Virginia; Tzavaras, Nikolaos; Kumar, Kunal; DeVita, Robert J; Stewart, Andrew F; Stanley, Sarah A; Garcia-Ocaña, Adolfo. (2024). Harmine and exendin-4 combination therapy safely expands human β cell mass in vivo in a mouse xenograft system.. Science translational medicine, 16(755), eadg3456. https://doi.org/10.1126/scitranslmed.adg3456