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Published in: Lasers in Medical Science 5/2018

01-07-2018 | Original Article

Effect of 660 nm visible red light on cell proliferation and viability in diabetic models in vitro under stressed conditions

Authors: S. M. Ayuk, N. N. Houreld, H. Abrahamse

Published in: Lasers in Medical Science | Issue 5/2018

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Abstract

The current study evaluated the photobiomodulatory effect of visible red light on cell proliferation and viability in various fibroblast diabetic models in vitro, namely, unstressed normal (N) and stressed normal wounded (NW), diabetic wounded (DW), hypoxic wounded (HW) and diabetic hypoxic wounded (DHW). Cells were irradiated at a wavelength of 660 nm with a fluence of 5 J/cm2 (11.23 mW/cm2), which related to an irradiation time of 7 min and 25 s. Control cells were not irradiated (0 J/cm2). Cells were incubated for 48 h and cellular proliferation was determined by measuring 5-bromo-2′-deoxyuridine (BrdU) in the S-phase (flow cytometry), while viability was assessed by the Trypan blue exclusion test and Apoptox-glo triplex assay. In comparison with the respective controls, PBM increased viability in N- (P ≤ 0.001), HW- (P ≤ 0.01) and DHW-cells (P ≤ 0.05). HW-cells showed a significant progression in the S-phase (P ≤ 0.05). Also, there was a decrease in the G2M phase in HW- and DHW-cells (P ≤ 0.05 and P ≤ 0.05, respectively). This study concludes that hypoxic wounded and diabetic hypoxic wounded models responded positively to PBM, and PBM does not damage stressed cells but has a stimulatory effect on cell viability and proliferation to promote repair and wound healing. This suggests that the more stressed the cells are the better they responded to photobiomodulation (PBM).
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Metadata
Title
Effect of 660 nm visible red light on cell proliferation and viability in diabetic models in vitro under stressed conditions
Authors
S. M. Ayuk
N. N. Houreld
H. Abrahamse
Publication date
01-07-2018
Publisher
Springer London
Published in
Lasers in Medical Science / Issue 5/2018
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-017-2432-2

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