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Blood, 1 November 2006, Vol. 108, No. 9, pp. 3053-3060.
Prepublished online as a Blood First Edition Paper on July 6, 2006; DOI 10.1182/blood-2006-05-020495.
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Submitted May 1, 2006
Accepted June 24, 2006
Cutaneous wound healing is impaired in hemophilia B
Maureane Hoffman*, Anna Harger, Angela Lenkowski, Ulla Hedner, Harold R. Roberts, and Dougald M Monroe
Durham VA Medical Center
Duke University
Novonordisk A/S
UNC School of Medicine
UNC Chapel Hill
* Corresponding author; email: maureane{at}med.unc.edu.
We used a mouse model to test the hypothesis that the time course and histology of wound healing is altered in hemophilia B. Three mm punch biopsies were placed in the skin of normal and hemophilic mice. The size of the wounds was measured daily until the epidermal defect closed. All wounds closed in hemophilic mice by 12 days, compared to 10 days in normal animals. Skin from the area of the wound was harvested at different time points and examined histologically. Hemophilic, but not normal animals, developed subcutaneous hematomas. Macrophage infiltration was significantly delayed in hemophilia B. Unexpectedly, hemophilic mice developed twice as many blood vessels in the healing wounds as controls, and the increased vascularity persisted for at least two weeks. The deposition and persistence of ferric iron was also greater in hemophilic mice. We hypothesize that iron plays a role in promoting excess angiogenesis after wounding as it had been proposed to do in hemophilic arthropathy. We have demonstrated that impaired coagulation leads to delayed wound healing with abnormal histology. Our findings have significant implications for treatment of hemophiliacs, and also highlight the importance of rapidly establishing hemostasis following trauma or surgery.

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