Background: Intermittent external volume expansion using suction enhances the vascular network of soft tissues, possibly increasing fat graft survival. However, the optimal kinetics of application have not been determined. Based on their previous experience, the authors hypothesized that moderate-intensity intermittent external volume expansion application may further enhance both the angiogenic and adipogenic potential.
Methods: Fifty 12-week-old wild-type mice were assigned to five experimental groups (n = 10 per group) and underwent five different intermittent applications of external volume expansion (i.e., single-application control, low-intensity, moderate-intensity, and two groups of high-intensity). Five days after the final stimulation, skin biopsy specimens were obtained from stimulated and contralateral nonstimulated areas. Microscopic sections were analyzed for angiogenesis, skin remodeling, and adipogenesis.
Results: Moderate-intensity intermittent stimulation (0.5 hour, 6 times/day for 5 days at −25 mmHg suction) almost doubled cutaneous vascular density (1.9-fold increase), induced skin thickening (1.9-fold increase), and expanded the subcutaneous tissue (2.3-fold increase) compared with control. External volume expansion kinetics did not affect tissue inflammation at 5 days after treatment. High-intensity intermittent stimulations also increased the density of blood vessels (1.6-fold increase compared with controls) but caused tissue damage, whereas low-intensity external volume expansion did not induce significant changes.
Conclusion: Application of moderate-intensity intermittent external volume expansion optimizes induction of angiogenesis and adipogenesis in soft tissues without tissue damage, holding potential for time-effective recipient-site preconditioning before fat grafting.
From the Tissue Engineering and Wound Healing Laboratory, Department of Surgery, Division of Plastic Surgery, Brigham and Women’s Hospital and Harvard Medical School.
Received for publication January 12, 2016; accepted July 14, 2016.
Limited data from this study were presented at the 2015 Clinical Congress of the American College of Surgeons, in Chicago, Illinois, October 4 through 8, 2015.
Disclosure: The authors have no financial interest to declare in relation to the content of this article.
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This work was supported by THE PLASTIC SURGERY FOUNDATION.
Dennis P. Orgill, M.D., Ph.D., Tissue Engineering and Wound Healing Laboratory, Department of Surgery, Division of Plastic Surgery, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis Street, Boston, Mass. 02115, firstname.lastname@example.org