Laser thermal preconditioning enhances dermal wound repair

Gerald J. Wilmink; Terry Carter; Jeffrey M. Davidson; E. Duco Jansen

doi:10.1117/12.767258

26 February 2008 Laser thermal preconditioning enhances dermal wound repair

Gerald J. Wilmink, Terry Carter, Jeffrey M. Davidson, E. Duco Jansen

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Proceedings Volume 6842, Photonic Therapeutics and Diagnostics IV; 68420O (2008) https://doi.org/10.1117/12.767258
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Preconditioning tissues with an initial mild thermal stress, thereby eliciting a stress response, can serve to protect tissue from subsequent stresses. Patients at risk for impaired healing, such as diabetics, can benefit from therapeutic methods which enhance wound repair. We present a laser thermal preconditioning protocol that accelerates cutaneous wound repair in a murine model. A pulsed diode laser (λ = 1.86 μm, τ_p = 2 ms, 50 Hz, H = 7.64 mJ/cm²) was used to precondition mouse skin before incisional wounds were made. The preconditioning protocol was optimized in vitro and in vivo using hsp70 expression, cell viability, and temperature measurements as benchmarks. Hsp70 expression was non-invasively monitored using a transgenic mouse strain with the hsp70 promoter driving luciferase expression. Tissue temperature recordings were acquired in real time using an infrared camera. Wound repair was assessed by measuring hsp70 expression, biomechanical properties, and wound histology for up to 24 d. Bioluminescence (BLI) was monitored with the IVIS 200 System (Xenogen) and tensile properties with a tensiometer (BTC-2000). The in vivo BLI studies indicated that the optimized laser preconditioning protocol increased hsp70 expression by 15-fold. The tensiometer data revealed that laser preconditioned wounds are ~40% stronger than control wounds at 10 days post surgery. Similar experiments in a diabetic mouse model also enhanced wound repair strength. These results indicate that 1) noninvasive imaging methods can aid in the optimization of novel laser preconditioning methods; 2) that optimized preconditioning with a 1.86 μm diode laser enhances early wound repair.

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Gerald J. Wilmink, Terry Carter, Jeffrey M. Davidson, and E. Duco Jansen "Laser thermal preconditioning enhances dermal wound repair", Proc. SPIE 6842, Photonic Therapeutics and Diagnostics IV, 68420O (26 February 2008); https://doi.org/10.1117/12.767258

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KEYWORDS

Tissues

Infrared cameras

Skin

Temperature metrology

Wound healing

In vivo imaging

Thermography

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