Low-Level Laser Therapy on Proliferation and Collagen Synthesis of Human Fibroblasts

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Low-Level Laser Therapy on Proliferation and Collagen Synthesis of Human Fibroblasts ( low-level-laser-therapy-proliferation-and-collagen-synthesis )

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Ma H et al. Laser therapy for wound healing 10 9 8 7 6 5 4 3 2 1 0 Control 635 nm Wavelength 635 nm+830 nm Fig. 3. Result of cell number using immunohistochemistry. Table 2. Statistical significances in cell proliferation analysis us- ing IHC staining Control - 0.264 *** * 830nm *** *** - 0.348 *P < 0.001, **P < 0.01, ***P < 0.05. Table 3. Statistical significances in collagen synthesis analysis using IHC staining Fig. 4. Representative samples of collagen synthesis study using immunohistochemistry. 830 nm Control 635 nm 830 nm 635 nm+830 nm 635 nm 0.264 - *** ** 635 nm+830 nm * ** 0.348 - Control 635 nm 830 nm 635 nm+830 nm Control - 830nm * ** - 0.123 *P < 0.001, **P < 0.01. significant differences were detected in IR group and FX group (Figs. 4, 5, and Table 3). Discussion According to previous research, LLLT has effect on energy and absorption levels of cells relevant to their respiratory chains [13]. This indicates that LLLT can stimulate compo- nents of the so-called antenna pigments of the respiratory chain of cells by using electromagnetic energy, therefore sen- sitizing cells by increasing mitochondrial ATP production [14]. Electromagnetic radiation in the form of light can vitalize mac- romolecules depending on wavelength. It can initiate confor- 35 30 25 20 15 10 5 0 4 www.jwmr.org https://doi.org/10.22467/jwmr.2018.00283 0.221 * * 635 nm 0.221 - ** * 635 nm+830 nm * * 0.123 - Control 635 nm Wavelength 635 nm+830 nm Fig. 5. Result of collagen synthesis using immunohistochemistry. mation changes in proteins and transfer energy to electrons [15]. Absorption of a specific wavelength of light can affect functioning photoreceptor (photoacceptor) molecule in the metabolic pathway involving redox chains [16]. It is known that an action spectrum follows the absorption spectrum of the photoacceptor molecule within certain limits [13,16]. For these reason, wavelength can play a fatal role in LLLT. As mentioned earlier, the preferred wavelength to stimulate fibro- blast proliferation at visible red light or invisible infrared light remain controversial. Another optimal parameter for LLLT is fluence. Exposure to lower-fluence laser light (from 0.09 to 20 J/cm2) [17] and 830 nm Green pixel color intensity (%) Blue pixel color intensity (%)

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