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  • Title: Experimental study on He-Ne laser irradiation to inhibit scar fibroblast growth in culture.
    Author: Shu B, Wu Z, Hao L, Zeng D, Feng G, Lin Y.
    Journal: Chin J Traumatol; 2002 Aug; 5(4):246-9. PubMed ID: 12162905.
    Abstract:
    OBJECTIVE: To explore the inhibitory effect of He-Ne laser irradiation on fibroblast growth of hypertrophic scars in culture. METHODS: He-Ne laser with wavelength of 632.8 nm, power density of 50 mW/cm(2) and doses of 3 J/cm(2), 30 J/cm(2), 90 J/cm(2) and 180 J/cm(2) was used to irradiate human scar fibroblasts in culture 1, 3 and 5 times respectively, and then the cell count and cell cycle analysis were done. RESULTS: Repeated irradiation with He-Ne laser at dose of 180 J/cm(2) three and five times led to an evident decrease in total cell number compared with that of the control group and there was a significant difference (P<0.05). The cell cycle analysis showed after three and five times of irradiation with 180 J/cm(2) He-Ne laser the cell number in S-phase decreased from 51% to 20% and 14% respectively, the cell number in G(0)/G(1) phase increased from 28% to 55% and 60% respectively, and the cell percentage in Sub-G1 phase was 6.7% and 9.8% respectively. CONCLUSIONS: Repeated irradiation with 180 J/cm(2) He-Ne laser can inhibit scar fibroblasts growth in culture. It may be that He-Ne laser irradiation causes cell stagnation in G(0)/G(1) phase and apoptosis.
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