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Laser biomodulation of normal and neoplastic cells

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Abstract

This study was designed to determine the laser dose for the stimulation, zero-bioactivation, and inhibition of normal and neoplastic cells in vitro. The medical use of laser biomodulation has been occurring for decades in the area of tissue healing and inflammatory conditions. The potential to modulate the regeneration and differentiation of early cellular precursors by laser photons is a valuable endeavor searching for novel and efficient methods. A 35-mW HeNe (632.8-nm) laser and power density of 1.25 mW/cm2 was used to irradiate tissue culture dishes seeded with 400 cells/dish of normal cells (CHO, CCL-226, 3 T3, and HSF) and neoplastic cells (EMT-6 and RIF-1). All cell lines were cultured using DMEM supplemented with 10% and 5% FBS, 2 mM glutamine and 100 U pen-strep antibiotic. Irradiation times of 16, 32, 48, 64, 80, 96, 112, 128, 144, and 160 s for three consecutive days to deliver cumulative doses of 60, 120, 180, 240, 300, 360, 420, 480, 540, and 600 mJ/cm2 were done, respectively. Cell cultures were stained and colony-forming efficiency was determined. Data analysis was done using Student’s t test, α = 0.05. A trend of stimulation, zero-bioactivation, and inhibition in all cell lines was observed except for CCL-226 which gave a pattern of inhibition, zero-bioactivation, and inhibition. The optimum biostimulatory dose was at 180 mJ/cm2 and bioinhibitory doses were from 420–600 mJ/cm2 cumulative doses. This study established the dose-dependency of cell growth to laser treatments, that the extent of cellular proliferation is influenced by the type of cells involved, and the risk when laser irradiation is performed on patients with undiagnosed neoplasms and during pregnancy. On the other hand, the ability of laser irradiation to regulate embryonic fibroblasts and human skin fibroblast in vitro suggests possible laser biomodulatory effects on embryonic and adult stem cells directed for tissue regeneration. Studies on the effects of light treatments exploring different laser parameters for the clonal expansion and differentiation of stem cells are recommended.

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Authors and Affiliations

  1. World Academy for Laser Applications (WALA), PO Box 59803, Riyadh, 11535, Kingdom of Saudi Arabia

    Farouk A. H. Al-Watban & Bernard L. Andres

  2. Laser Research Section, Biological & Medical Research Department, King Faisal Specialist Hospital & research Centre, Riyadh, Saudi Arabia

    Bernard L. Andres

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  1. Farouk A. H. Al-Watban
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  2. Bernard L. Andres
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Correspondence to Farouk A. H. Al-Watban.

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Al-Watban, F.A.H., Andres, B.L. Laser biomodulation of normal and neoplastic cells. Lasers Med Sci 27, 1039–1043 (2012). https://doi.org/10.1007/s10103-011-1040-9

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  • DOI: https://doi.org/10.1007/s10103-011-1040-9

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