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Background:  The invention of non-ionizing emission devices revolutionized science, medicine, industry, and the military. Currently, different laser systems are commonly used, generating the potential threat of excessive radiation exposure, which can lead to adverse health effects. Skin is the organ most exposed to laser irradiation; therefore, this study aims to evaluate the effects of 445 nm, 520 nm, and 638 nm non-ionizing irradiation on keratinocytes and fibroblasts.  Methods:  Keratinocytes and fibroblasts were exposed to a different fluency of 445 nm, 520 nm, and 638 nm laser irradiation. In addition, viability, type of cell death, cell cycle distribution, and proliferation rates were investigated.  Results:  The 445 nm irradiation was cytotoxic to BJ-5ta (≥58.7 J/cm 2 ) but not to Ker-CT cells. Exposure influenced the cell cycle distribution of Ker-CT (≥61.2 J/cm 2 ) and BJ-5ta (≥27.6 J/cm 2 ) cells, as well as the Bj-5ta proliferation rate (≥50.5 J/cm 2 ). The 520 nm irradiation was cytotoxic to BJ-5ta (≥468.4 J/cm 2 ) and Ker-CT (≥385.7 J/cm 2 ) cells. Cell cycle distribution (≥27.6 J/cm 2 ) of Ker-CT cells was also affected. The 638 nm irradiation was cytotoxic to BJ-5ta and Ker-CT cells (≥151.5 J/cm 2 ). The proliferation rate and cell cycle distribution of BJ-5ta (≥192.9 J/cm 2 ) and Ker-CT (13.8 and 41.3 J/cm 2 ) cells were also affected.  Conclusions:  At high fluences, 455 nm, 520 nm, and 638 nm irradiation, representing blue, green, and red light spectra, are hazardous to keratinocytes and fibroblasts. However, laser irradiation may benefit the cells at low fluences by modulating the cell cycle and proliferation rate.

Effects of 445 nm, 520 nm, and 638 nm Laser Irradiation on the Dermal Cells