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Wound healing during hibernation by black bears (Ursus americanus) in the wild: elicitation of reduced scar formation

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Integrative Zoology 2012年第1期7卷 48-60页

作者： Paul A.IAIZZO timothy g.laske Henry J.HARLOW Carolyn B.McCLAY David L.gARSHELIS Department of Surgery University of Minnesota Medtronic Inc Department of Zoology and Physiology University of WyomingLaramie Minnesota Department of Natural Resources USA

Even mildly hypothermic body or limb temperatures can retard healing processes in *** this,we observed that hibernating American black bears(Ursus americanus Pallas,1780)elicit profound abilities in mounting inflammatory responses to infection and/or foreign *** addition,they resolve injuries during hibernation while maintaining mildly hypothermic states(30–35°C)and without eating,drinking,urinating or *** describe experimental studies on free-ranging bears that document their abilities to completely resolve cutaneous cuts and punctures incurred during or prior to *** induced small,full-thickness cutaneous wounds(biopsies or incisions)during early denning,and re-biopsied sites 2–3 months later(near the end of denning).Routine histological methods were used to characterize these skin *** biopsied sites with respect to secondary intention(open circular biopsies)and primary intention(sutured sites)healed,with evidence of initial eschar(scab)formation,completeness of healed epidermis and dermal layers,dyskeratosis(inclusion cysts),and abilities to produce hair *** healing abilities of hibernating black bears are a clear survival advantage to animals injured before or during *** are known to have elevated levels of hibernation induction trigger(delta-opioid receptor agonist)and ursodeoxycholic acid(major bile acid within plasma,mostly conjugated with taurine)during hibernation,which may relate to these wound-healing *** research as to the underlying mechanisms of wound healing during hibernation could have applications in human *** approaches may be found to improve healing for malnourished,hypothermic,diabetic and elderly patients or to reduce scarring associated with burns and traumatic injuries.

关键词： black bear denning hair growth healing hibernation histology scarring

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