Temperature-dependent impact of thermal aminolaevulinic acid photodynamic therapy on apoptosis and reactive oxygen species generation in human dermal fibroblasts

A. Mamalis, E. Koo, G. D. Sckisel, D. M. Siegel, Jared Jagdeo

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Background: Actinic keratoses (AKs) are generally accepted as common precursor lesions to invasive squamous cell carcinoma. Photodynamic therapy (PDT) is a common, in-office, field therapy modality used in the treatment of AKs. Clinical and laboratory observations have demonstrated that temperature modulation can affect PDT efficacy. Objectives: To demonstrate thermal PDT increases apoptotic cell death, and to investigate the mechanistic role of reactive oxygen species (ROS) free radicals in an in vitro human skin fibroblast model. Methods: This study was completed using commercially available primary human skin fibroblasts treated with aminolaevulinic acid (ALA) at specific concentrations and controlled temperatures. Cell death, apoptosis and superoxide ROS levels were quantified. Results: We found that thermal PDT with 0·5 mmol L−1 ALA resulted in significant temperature-dependent increases in total apoptosis and superoxide ROS generation between 33 °C and 42 °C. Conclusions: Our results indicate that thermal PDT significantly increases apoptotic cell death through increased generation of superoxide ROS in a temperature-dependent manner.

Original languageEnglish (US)
Pages (from-to)512-519
Number of pages8
JournalBritish Journal of Dermatology
Volume175
Issue number3
DOIs
StatePublished - Sep 1 2016

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Aminolevulinic Acid
Photochemotherapy
Reactive Oxygen Species
Fibroblasts
Hot Temperature
Apoptosis
Skin
Temperature
Superoxides
Actinic Keratosis
Cell Death
Free Radicals
Squamous Cell Carcinoma
Therapeutics

ASJC Scopus subject areas

  • Medicine(all)
  • Dermatology

Cite this

Temperature-dependent impact of thermal aminolaevulinic acid photodynamic therapy on apoptosis and reactive oxygen species generation in human dermal fibroblasts. / Mamalis, A.; Koo, E.; Sckisel, G. D.; Siegel, D. M.; Jagdeo, Jared.

In: British Journal of Dermatology, Vol. 175, No. 3, 01.09.2016, p. 512-519.

Research output: Contribution to journalArticle

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AU - Mamalis, A.

AU - Koo, E.

AU - Sckisel, G. D.

AU - Siegel, D. M.

AU - Jagdeo, Jared

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N2 - Background: Actinic keratoses (AKs) are generally accepted as common precursor lesions to invasive squamous cell carcinoma. Photodynamic therapy (PDT) is a common, in-office, field therapy modality used in the treatment of AKs. Clinical and laboratory observations have demonstrated that temperature modulation can affect PDT efficacy. Objectives: To demonstrate thermal PDT increases apoptotic cell death, and to investigate the mechanistic role of reactive oxygen species (ROS) free radicals in an in vitro human skin fibroblast model. Methods: This study was completed using commercially available primary human skin fibroblasts treated with aminolaevulinic acid (ALA) at specific concentrations and controlled temperatures. Cell death, apoptosis and superoxide ROS levels were quantified. Results: We found that thermal PDT with 0·5 mmol L−1 ALA resulted in significant temperature-dependent increases in total apoptosis and superoxide ROS generation between 33 °C and 42 °C. Conclusions: Our results indicate that thermal PDT significantly increases apoptotic cell death through increased generation of superoxide ROS in a temperature-dependent manner.

AB - Background: Actinic keratoses (AKs) are generally accepted as common precursor lesions to invasive squamous cell carcinoma. Photodynamic therapy (PDT) is a common, in-office, field therapy modality used in the treatment of AKs. Clinical and laboratory observations have demonstrated that temperature modulation can affect PDT efficacy. Objectives: To demonstrate thermal PDT increases apoptotic cell death, and to investigate the mechanistic role of reactive oxygen species (ROS) free radicals in an in vitro human skin fibroblast model. Methods: This study was completed using commercially available primary human skin fibroblasts treated with aminolaevulinic acid (ALA) at specific concentrations and controlled temperatures. Cell death, apoptosis and superoxide ROS levels were quantified. Results: We found that thermal PDT with 0·5 mmol L−1 ALA resulted in significant temperature-dependent increases in total apoptosis and superoxide ROS generation between 33 °C and 42 °C. Conclusions: Our results indicate that thermal PDT significantly increases apoptotic cell death through increased generation of superoxide ROS in a temperature-dependent manner.

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