Impaired skin wound healing is a significant co-morbid condition of diabetes that is caused by poor microcirculation among other factors. Hypoxia-inducible factors (HIFs) are transcription factors that mediate the effects of decreased levels of oxygen in biological environments. Inducing mild hypoxia in the tissue could promote angiogenesis, a critical step in the wound healing process in diabetic wounds. To investigate the relationship between hypoxia and diabetic wound healing, a topical treatment consisting of a HIF-activating prolyl-hydroxylase inhibitor was administered to the wounded skin of diabetic (db/db) mice. Studies were conducted in accordance with the GSK Policy on the Care, Welfare and Treatment of Laboratory Animals and were reviewed at GSK or by the ethical review process at the institution where the work was performed. The wounded area was tracked in vivo for 28 days utilizing a custom-built multimodal microscopy system. An increase in vascular density around the wounds of treated animals was observed using phase-variance optical coherence tomography (PV-OCT), in comparison to normal controls. In addition, second harmonic generation (SHG) and fluorescence lifetime imaging microscopy (FLIM) were utilized to examine the collagen regeneration and cellular metabolic activity, respectively, in the wounded skin. The utilization of these light based methods can follow metabolic and morphologic changes in the wound healing process in ways not possible with current evaluation processes. Insights demonstrated in these studies could lead to new endpoints for evaluation of the efficacy of drugs and lead to more direct ways of detecting patient response to treatment.
Joanne Li, Andrew J. Bower, Zane A. Arp, Eric Olson, Claire Holland, Eric J. Chaney, Marina Marjanovic, and Stephen A. Boppart M.D., "Investigation of an angiogenesis-promoting topical treatment for diabetic wounds using multimodal microscopy (Conference Presentation)," Proc. SPIE 9689, Photonic Therapeutics and Diagnostics XII, 96890I (Presented at SPIE BiOS: February 14, 2016; Published: 27 April 2016); https://doi.org/10.1117/12.2211647.4828143198001.
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