Acute effects of low-level laser therapy (660 nm) on oxidative stress levels in diabetic rats with skin wounds

J Exp Ther Oncol. 2017 Sep;11(2):85-89.


Background: Laser therapy influences oxidative stress parameters such as the activity of antioxidant enzymes and the production of reactive oxygen species.

Objective: To analyze the effects of low-level laser therapy on oxidative stress in diabetics rats with skin wounds.

Methods: Thirty-six animals were divided into 4 groups: NDNI: non-diabetic rats with cutaneous wounds that not received laser therapy; NDI: non-diabetic rats with cutaneous wounds that received laser therapy; DNI: diabetic rats with skin wounds who did not undergo laser therapy; DI: rats with diabetes insipidus and cutaneous wounds and received laser therapy. The animals were treated with LLLT (660 nm, 100 mW, 6 J/cm, spot size 0.028 cm). On the day of killing the animals, tissue-wrapped cutaneous wounds were collected and immediately frozen, centrifuged, and stored to analyze malondialdehyde (MDA) levels.

Results: Significant difference was observed within the groups of MDA levels (ANOVA, p = 0.0001). Tukey's post-hoc test showed significantly lower values of MDA in irradiated tissues, both in diabetic and non-diabetic rats. ANOVA of the diabetic group revealed a significant difference (p < 0.01) when all groups, except NDI and DI, were compared.

Conclusions: LLLT was effective in decreasing MDA levels in acute surgical wounds in diabetic rats.

Keywords: Laser; Malondialdehyde; Oxidative stress.

MeSH terms

  • Animals
  • Diabetes Mellitus, Experimental / metabolism*
  • Low-Level Light Therapy*
  • Male
  • Malondialdehyde / metabolism
  • Malondialdehyde / radiation effects
  • Oxidative Stress / radiation effects*
  • Rats
  • Rats, Wistar
  • Reactive Oxygen Species / metabolism
  • Reactive Oxygen Species / radiation effects
  • Skin / metabolism
  • Skin / radiation effects*
  • Wounds and Injuries / metabolism*


  • Reactive Oxygen Species
  • Malondialdehyde