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Investigating Leptin Regulation of the Human Diabetic Immune System in Nonhealing Diabetic Foot Ulcers

UMass Diabetes researchers are collaborating on a potential therapeutic approach to preventing lower-extremity amputations in people with diabetes

Date Posted: Wednesday, September 01, 2021


Approximately a third of all people with diabetes develop diabetic foot ulcers.  While current treatment is effective for some patients, about half of diabetic foot ulcers become nonhealing and result in amputation.  Scientists at the UMass Diabetes Center of Excellence believe that can be avoided. 

A collaborative team developed a human bone marrow biobank from surgical patients with diabetic foot ulcers to study the diabetic immune system and how it regulates wound healing.

The researchers consisting of Tammy Nguyen, MD, PhD, Silvia Corvera, MD, Michael Brehm, PhD, and Louis Messina, MD, have a novel method to collect and expand Hematopoietic stem cells (HSCs) from diabetic and nondiabetic patients.  Their studies have identified leptin as an important signaling pathway for wound healing.

“Hematopoietic stem cells have a central role in wound healing,” explained Dr. Nguyen.  “Originating from the bone marrow, HSCs give rise to key immune cells called monocytes and macrophages, that are important for wound healing.”  

Currently, the effect of leptin on HSC differentiation into monocytes and macrophage is unknown. However, the team hypothesizes that bone marrow leptin signaling may be the key to monocyte-macrophage development in nonhealing diabetic ulcers.

“Our group’s primary goal is to improve patient quality and quantity of life by preventing lower-extremity amputations from nonhealing diabetic foot ulcers,” she said. “We chose to submit our project to be considered for a PACE Award because we wanted to highlight our translational research project and promote
the importance of developing novel research through cross specialty collaborations.”

The UMass Memorial Medical Group's Prize for Academic Collaboration and Excellence (PACE) supports UMass Memorial physicians who participate in research. As a runner up for the prize, UMass Memorial Medical Group will help the team to identify potential sources of additional funding to help facilitate their collaborative work.

“We are incredibly grateful for the opportunity to present our research and feel confident that with continual support from leadership we will be able to move forward with our discoveries,” added Dr. Nguyen.

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