Stem cell research uncovers mechanism for type 2 diabetes

February 13, 2009

Taking clues from their stem cell research, investigators at the University of California San Diego (UC San Diego) and Burnham Institute for Medical Research (Burnham) have discovered that a signaling pathway involved in normal pancreatic development is also associated with type 2 diabetes. Their findings, published online January 9 in Experimental Diabetes Research, could provide a potential new target for therapy.

Pamela Itkin-Ansari, Ph.D., assistant adjunct professor at the UC San Diego School of Medicine and Burnham; Fred Levine, M.D., Ph.D., professor and director of the Sanford Children's Health Research Center at Burnham, and colleagues showed that the Wnt signaling pathway is up-regulated in insulin producing cells of pancreases from adults with type 2 diabetes.

"It is now clear that progenitor cells, with the capacity to become insulin producing cells, reside in the adult pancreas," said Dr. Itkin-Ansari. "The key to harnessing those cells to treat diabetes is to understand the signaling pathways that are active in the pancreas under both normal and disease conditions. In the course of that research we found that Wnt signaling activity, which plays a critical role in the development of the pancreas, re-emerges in type 2 diabetes."

The Wnt signaling pathway - a series of protein interactions that control several genes -plays a role in normal development, as well as cancer, in many tissues. In this study, the scientists compared the expression of different proteins in the Wnt pathway in the pancreas from adults with type 2 diabetes and those from healthy individuals. The researchers discovered that cells from those without the disease had low levels of beta-catenin, a protein that enters cell nuclei and activates certain genes. Beta cells from people with type 2 diabetes had increased levels of the protein.

Activation of the Wnt pathway also up-regulates the expression of c-myc, which has been implicated in the destruction of insulin-producing beta cells. Significantly, Wnt signaling was also apparent in obese mice well before they developed symptoms, indicating that Wnt may be an important factor leading to Type 2 diabetes.

Burnham Institute

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