Accession Number : ADA627649


Title :   Mechanical Unloading Impairs Keratinocyte Migration and Angiogenesis During Cutaneous Wound Healing


Descriptive Note : Journal article


Corporate Author : ARMY INST OF SURGICAL RESEARCH FORT SAM HOUSTON TX


Personal Author(s) : Radek, Katherine A ; Baer, Lisa A ; Eckhardt, Jennifer ; DiPietro, Luisa A ; Wade, Charles E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a627649.pdf


Report Date : 01 Feb 2008


Pagination or Media Count : 10


Abstract : Although initially thought to improve an individual s ability to heal, mechanical unloading promoted by extended periods of bed rest has emerged as a contributing factor to delayed or aberrant tissue repair. Using a rat hindlimb unloading (HLU) model of hypogravity, we mimicked some aspects of physical inactivity by removing weight- bearing loads from the hindlimbs and producing a systemic cephalic fluid shift. This model simulates bed rest in that the animal undergoes physiological adaptations, resulting in a reduction in exercise capability, increased frequency of orthostatic intolerance, and a reduction in plasma volume. To investigate whether changes associated with prior prolonged bed rest correlate with impaired cutaneous wound healing, we examined wound closure, angiogenesis, and collagen content in day 2 to day 21 wounds from rats exposed to HLU 2 wk before excisional wounding. Wound closure was delayed in day 2 wounds from HLU rats compared with ambulatory controls. Although the levels of proangiogenic growth factors, fibroblast growth factor-2 (FGF-2), and vascular endothelial growth factor (VEGF) were similar between the two groups, wound vascularity was significantly reduced in day 7 wounds from HLU animals. To further examine this disparity, total collagen content was assessed but found to be similar between the two groups. Taken together, these results suggest that keratinocyte and endothelial cell function may be impaired during the wound healing process under periods of prolonged inactivity or bed rest.


Descriptors :   *ANGIOGENESIS , *EPIDERMIS , *HEALING , *REGENERATION(PHYSIOLOGY) , *TISSUES(BIOLOGY) , *WOUNDS AND INJURIES , ABNORMALITIES , ADAPTATION(PHYSIOLOGY) , BLOOD PLASMA , BLOOD VOLUME , CARDIOVASCULAR SYSTEM , CELLS(BIOLOGY) , CLINICAL MEDICINE , COLLAGEN , ENDOTHELIUM , EXPOSURE(PHYSIOLOGY) , FIBROBLASTS , GROWTH(PHYSIOLOGY) , KERATINIZATION , LOADS(FORCES) , PHYSICAL PROPERTIES , RATS , REPAIR


Subject Categories : Anatomy and Physiology
      Medicine and Medical Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE