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Photobiomodulation by blue light induces a dose dependent biphasic proliferation curve in human keratinocytes [exp1]

ABSTRACT: Photobiomodulation (PBM) with blue light induces a biphasic dose response curve in proliferation of immortalized human keratinocytes (HaCaT), with a maximum proliferative effect reached with 7.5min (10.35J/cm2). The aim of this study was to test the photobiomodulatory effect of 10.35J/cm2 blue light irradiation on cell proliferation, ROS production and gene expression at different time points after irradiation of HaCaT cells in vitro and to compare the results with the anti-proliferative phase of PBM using blue light with 41.4J/cm2. For 10.35J/cm2 cell proliferation was increased for all measured harvesting time points up to at least 24h after irradiation. ROS concentration was increased 30min after irradiation. However, already 1h after irradiation, cells were able to decrease ROS and stabilize the concentration to the basal level. The sudden increase in ROS was even higher when compared to 41.4J/cm2. However, gene expression analysis did not indicate any sign of apoptosis and even indicated an activation of cell survival mechanisms. Furthermore, comparable to 41.4J/cm2, aryl hydrocarbon receptor (AHR) “battery genes” showed a deregulation after blue light irradiation strengthening the hypothesis of AHR as possible target for blue light irradiation.

ORGANISM(S): Homo sapiens

PROVIDER: GSE89083 | GEO | 2019/10/01

REPOSITORIES: GEO

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Project description:FelixGarza2017 - Blue Light Treatment of Psoriasis (simplified) This model is described in the article: A Dynamic Model for Prediction of Psoriasis Management by Blue Light Irradiation. Félix Garza ZC, Liebmann J, Born M, Hilbers PA, van Riel NA. Front Physiol 2017; 8: 28 Abstract: Clinical investigations prove that blue light irradiation reduces the severity of psoriasis vulgaris. Nevertheless, the mechanisms involved in the management of this condition remain poorly defined. Despite the encouraging results of the clinical studies, no clear guidelines are specified in the literature for the irradiation scheme regime of blue light-based therapy for psoriasis. We investigated the underlying mechanism of blue light irradiation of psoriatic skin, and tested the hypothesis that regulation of proliferation is a key process. We implemented a mechanistic model of cellular epidermal dynamics to analyze whether a temporary decrease of keratinocytes hyper-proliferation can explain the outcome of phototherapy with blue light. Our results suggest that the main effect of blue light on keratinocytes impacts the proliferative cells. They show that the decrease in the keratinocytes proliferative capacity is sufficient to induce a transient decrease in the severity of psoriasis. To study the impact of the therapeutic regime on the efficacy of psoriasis treatment, we performed simulations for different combinations of the treatment parameters, i.e., length of treatment, fluence (also referred to as dose), and intensity. These simulations indicate that high efficacy is achieved by regimes with long duration and high fluence levels, regardless of the chosen intensity. Our modeling approach constitutes a framework for testing diverse hypotheses on the underlying mechanism of blue light-based phototherapy, and for designing effective strategies for the treatment of psoriasis. This model is hosted on BioModels Database and identified by: BIOMD0000000695. To cite BioModels Database, please use: Chelliah V et al. BioModels: ten-year anniversary. Nucl. Acids Res. 2015, 43(Database issue):D542-8. To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

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Photobiomodulation by blue light induces a dose dependent biphasic proliferation curve in human keratinocytes [exp1]

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