Research ArticleCIRCADIAN RHYTHM

Circadian actin dynamics drive rhythmic fibroblast mobilization during wound healing

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Science Translational Medicine  08 Nov 2017:
Vol. 9, Issue 415, eaal2774
DOI: 10.1126/scitranslmed.aal2774

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  • RE: Circadian actin dynamics drive rhythmic fibroblast mobilization during wound healing
    • Simon P Booth, Burn Research Fellow, Queen Victoria Hospital NHS foundation trust
    • Other Contributors:
      • Robert N Manton, Junior Fellow, Queen Victoria Hospital
      • Baljit S Dheansa, Consultant Burn and Plastic Reconstructive Surgeon, Queen Victoria Hospital

    In the recent paper by Hoyle et al. (2017), it was suggested that diurnal changes in Actin production were responsible for wounds occurring at night taking longer to close than wounds that occur in the day. The authors supported this conclusion with a 118 patient dataset from the international Burn injury database. While results from the in-vitro scratch assay and mouse models suggest a circadian rhythm in actin production, they take no account of the multivariate nature of wound healing outside of the laboratory and in the clinic or community. Burn wound healing is a multi-modal process with many confounding factors. Time of injury, time until first aid is administered, the time taken until advanced care is given including, if necessary surgical closure, the injuring agent, depth of burn co-morbidities and active management all will affect wound healing.

    Our own data suggests that there is no difference. Using the Cox proportional hazard method to assess our own data, from 1999 to the present time. We analysed over 5000 Adult records with complete data. The median healing time for wound closure was identical at 12 days post-injury. There was no significant difference in time from injury to referral and assessment. The ratio of injuries occurring during the night (20:00 to 08:00) compared to daytime was 1:4.

    The data extracted from the international burn injury database (IBID) for Hoyle et al.’s (2017) study is not representative of the burn population in th...

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    Competing Interests: None declared.