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Sci Rep. 2016 Sep 27;6:33847. doi: 10.1038/srep33847.

Gene expression profiling reveals aryl hydrocarbon receptor as a possible target for photobiomodulation when using blue light.

Scientific reports

Anja Becker, Anna Klapczynski, Natalia Kuch, Fabiola Arpino, Katja Simon-Keller, Carolina De La Torre, Carsten Sticht, Frank A van Abeelen, Gerrit Oversluizen, Norbert Gretz

Affiliations

  1. Medical Research Centre, University of Heidelberg, D-68167 Mannheim, Germany.
  2. Philips Group Innovation, Research, High Tech Campus 34, 7.031, 5656 AE Eindhoven, The Netherlands.

PMID: 27669902 PMCID: PMC5037386 DOI: 10.1038/srep33847

Abstract

Photobiomodulation (PBM) with blue light induces a biphasic dose response curve in proliferation of immortalized human keratinocytes (HaCaT), with a maximum anti-proliferative effect reached with 30min (41.4 J/cm2). The aim of this study was to test the photobiomodulatory effect of 41.4 J/cm2 blue light irradiation on ROS production, apoptosis and gene expression at different time points after irradiation of HaCaT cells in vitro and assess its safety. ROS concentration was increased 30 min after irradiation. However, already 1 h after irradiation, cells were able to reduce ROS and balance the concentration to a normal level. The sudden increase in ROS did not damage the cells, which was demonstrated with FACS analysis where HaCaT cells did not show any sign of apoptosis after blue light irradiation. Furthermore, a time course could be seen in gene expression analysis after blue light, with an early response of stimulated genes already 1 h after blue light irradiation, leading to the discovery of the aryl hydrocarbon receptor as possible target for blue light irradiation.

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