Healing of diabetic wounds still remains a critical medical problem. Polydeoxyribonucleotide (PDRN), a compound having a mixture of deoxyribonucleotide polymers, stimulates the A2 purinergic receptor with no toxic or adverse effect. We studied the effects of PDRN in diabetes-related healing defect using an incisional skin-wound model produced on the back of female diabetic mice (db1/ db1) and their normal littermates (db1/1m). Animals were treated daily for 12 days with PDRN (8 mg/kg/ip) or its vehicle (100 mL 0.9%NaCl). Mice were killed 3, 6, and 12 days after skin injury to measure vascular endothelial growth factor (VEGF) mRNA expression and protein synthesis, to assay angiogenesis and tissue remodeling through histological evaluation, and to study CD31, Angiopoietin-1 and Transglutaminase-II. Furthermore, we measured wound breaking strength at day 12. PDRN injection in diabetic mice resulted in an increased VEGF message (vehicle51.0 AE 0.2 n-fold vs. b-actin; PDRN51.5 AE 0.09 n-fold vs. b-actin) and protein wound content on day 6 (vehicle50.3 AE 0.07 pg/wound; PDRN50.9 AE 0.1 pg/wound). PDRN injection improved the impaired wound healing and increased the wound-breaking strength in diabetic mice. PDRN also caused a marked increase in CD31 immunostaining and induced Transglutaminase-II and Angiopoietin-1 expression. Furthermore, the concomitant administration of 3,7-dimethyl-1-propargilxanthine, a selective adenosine A2A receptor antagonist, abolished PDRN positive effects on healing. However, 3,7-dimethyl-1-propargilxanthine alone did not affect wound healing in both diabetic mice and normal littermates. These results suggest that PDRN might be useful in wound disorders associated with diabetes.

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: Our results confirm that vein-covering of a transected nerve stump can be effective in reducing neuroma formation. Moreover, unlike previous works that buried the nerve into an adjacent vein left in place, our experiments showed that also the use of a free vein graft cap can hinder neuroma formation. Although translation of rat experiments to the clinics should be dealt with caution, our data suggest a careful clinical use of the technique. (c) 2009 Wiley-Liss, Inc. Microsurgery, 2009.

Background: Fournier’s gangrene (FG) is a very aggressive necrotizing fasciitis involving subcutaneous fat and skin of scrotal and perineal regions. Vacuum-assisted closure (VAC) is a well-known method used to treat complex wounds. The authors for the first time enhance a multimodal strategy to treat the FG using VAC, reducing the number of surgical debridements, allowing a one-step surgical reconstruction with locoregional fasciocutaneous flap. Methods: Six patients with the diagnosis of FG were reviewed retrospectively at our institution. All patients were affected by very extensive FG. The FG Severity Index (FGSI) was used to evaluate the prognosis of the case at admission. Following the acute phase (24–48 h), VAC was used to achieve wound cleaning and prepare the area to a single-stage reconstruction with superomedial thigh flap. Hyperbaric oxygen therapy was also used before final reconstruction. Results: The average FGSI was 10.5, ranging from 8 to 12. All patients survived and were completely healed at the mean follow-up time of 9 months (range 3–30 months). Conclusions: VAC therapy is effective to clean and prepare the wounds, cutting off the fasciitis process and reducing the hospital stay and patient discomfort. Multidisciplinary treatment is mandatory during this devastating infection.

Our study suggests that rAAV-VEGF gene transfer may be an effective therapeutic approach to improve clinical outcomes after thermal injury.