Management of lower extremity neuropathic ulcers in diabetic patients has changed little in the past decade. The healing rate is poor, risk of amputations relatively high, and there is a paucity of objective methods for choosing treatments. We will carry out a multi-center clinical cohort study of circulating and wound margin vasculogenic stem/progenitor cells (SPCs) in diabetic patients undergoing treatment for lower extremity neuropathic ulcers. The goal is to develop simple, quantitative methods that provide guidance on effective treatment choices. Our hypothesis is that an analysis of SPCs number and their biochemical characteristics can predict whether diabetic foot ulcers will heal. The experimental approach is built on the very productive framework used in our preliminary R21 project and recent publication. The four specific aims center on SPCs and their association with traditional methods for assessing diabetic control and wound characteristics.
Aims are as follows: (1) Determine whether SPCs mobilization/wound recruitment and hypoxia inducible factor-related processes are associated with wound repair, (2) Assess if wound care practices are associated with SPCs mobilization and SPCs homing to wounds, (3) Determine if variations in SPCs are associated with healing, and (4) Assess whether SPCs differences observed between a healing acute biopsy wound versus the foot ulcer are related to clinical issues such as metabolic status. We will evaluate whether SPCs number and content of several intracellular proteins correlate with wound and disease-related factors and whether these measurements can be used to predict diabetic wound healing.

Public Health Relevance

We plan to carry out a multi-center clinical cohort study of circulating and wound margin vasculogenic stem/progenitor cells in diabetic patients undergoing treatment for limb-threatening lower extremity neuropathic ulcers. The goal is to develop simple, quantitative methods to assess ulcers that provide guidance on effective treatment choices. Our hypothesis is that an analysis of stem/progenitor cell number and their biochemical characteristics can predict whether diabetic foot ulcers will heal.

Agency
National Institute of Health (NIH)
Type
Research Project (R01)
Project #
5R01DK094260-03
Application #
8731122
Study Section
Special Emphasis Panel (ZDK1)
Program Officer
Jones, Teresa L Z
Project Start
Project End
Budget Start
Budget End
Support Year
3
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Maryland Baltimore
Department
Emergency Medicine
Type
Schools of Medicine
DUNS #
City
Baltimore
State
MD
Country
United States
Zip Code
21201
Heyboer 3rd, Marvin; Milovanova, Tatyana N; Wojcik, Susan et al. (2014) CD34+/CD45-dim stem cell mobilization by hyperbaric oxygen - changes with oxygen dosage. Stem Cell Res 12:638-45
Fosen, Katina M; Thom, Stephen R (2014) Hyperbaric oxygen, vasculogenic stem cells, and wound healing. Antioxid Redox Signal 21:1634-47
Margolis, David J; Gupta, Jayanta; Hoffstad, Ole et al. (2013) Lack of effectiveness of hyperbaric oxygen therapy for the treatment of diabetic foot ulcer and the prevention of amputation: a cohort study. Diabetes Care 36:1961-6