Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica ›› 2017, Vol. 39 ›› Issue (3): 301-306.doi: 10.3881/j.issn.1000-503X.2017.03.001

• Orginal Article •     Next Articles

Effects of 630 nm Red and 460 nm Blue Light Emitting Diode Irradiation on Healing of the Skin Wound in Japanese Big-ear White Rabbit

Yanhong LI1, Jigang ZHANG2, Yanfeng XU1, Yunlin HAN1, Binbin JIANG2, Lan HUANG1, Hua ZHU1, Yuhuan XU1, Weiling YANG2(), Chuan QIN1()   

  1. 1Key Laboratory of Human Diseases Comparative Medicine,Ministry of Health & Key Laboratory of Human Diseases Animal Models,State Administration of Traditional Chinese Medicine,Institute of Medical Laboratory Animal Science,CAMS and PUMC,Beijing 100021,China
    2Department of Dermatology,the General Hospital of the PLA Rocket Force,Beijing 100088,China
  • Received:2016-02-23 Online:2017-06-30 Published:2017-06-20

Abstract:

Objective To observe the effects of 630 nm red light and 460 nm blue light emitting diode irradiation on the healing of skin wounds in Japanese big-ear white rabbits. Methods The skin wound model was established with 8 Japanese big-ear white rabbits. Three parts of vulnus in each rabbit were used:two parts of vulnus were irradiated vertically by red and blue LED light,respectively(15 min/time),and the distance between lights and wounds was 15 cm;the 3rd part of the wound was used as a control. On the 21st day of the wounds exposure to light,the number of healing wounds and the percentage of healing area were recorded and the treatment effect of these two light sources was compared. HE staining was used to analyze the newborn tissue structure. Masson staining was used to observe the proliferation of skin collagen fibers. Immuohistochemical staining was used to analyze fibroblast growth factor(FGF),epidermal growth factor(EGF),endothelial growth factor(CD31),proliferating cell nuclear antigen(Ki-67),and inflammatory cytokines(CD68)infiltration in the skin. Results The healing rate in the red light,blue light,and control groups was 50.0%(4/8),25.0%(2/8),and 12.5%(1/8),respectively. Since the 12th day after modeling,the healing area percentage in the red light group was significantly higher than those in the blue light and control groups(P<0.05,P<0.01). On the 21st day after modeling,the skin thickness of the red light group was(2.95±0.34)mm,which was significantly higher than that in control group [(2.52±0.42)mm;F=3.182,P=0.016)]. The average optical density of collagen fibers was 0.15±0.03 in red light group,which was significantly higher than that of the blue light group(0.09±0.01;F=7.316,P=0.012)and control(0.07±0.01;F=7.316,P=0.003). The results of immunohistochemistry showed the expression levels of EGF,FGF,CD31 antigen,and Ki-67 in the red light group were significantly higher than those in the blue light and control groups,whereas the CD68 expression was significantly lower(P<0.05 or P<0.01). Conclusion LED red light irradiation can promote the healing of skin wounds in Japanese big-ear white rabbits,which may be achieved by the effect of red light irradiation in stimulating the proliferation of skin epidermal cells,vascular endothelial cells,and fiberous tissue.

Key words: light emitting diode, skin wounds, Japanese white rabbit, proliferation, inflammation

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