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Journal of Biomedical Optics

Changes in the redox state and endogenous fluorescence of in vivo human skin due to intrinsic and photo-aging, measured by multiphoton tomography with fluorescence lifetime imaging
Author(s): Washington Y. Sanchez; Clara Obispo; Elizabeth Ryan; Jeffrey Grice; Michael S. Roberts
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Paper Abstract

Ultraviolet radiation from solar exposure is a key extrinsic factor responsible for premature skin aging (i.e., photo-aging). Recent advances using in vivo multiphoton tomography (MPT) demonstrate the efficacy of this approach to assess intrinsic and extrinsic skin aging as an alternative to existing invasive techniques. In this study, we measured changes in epidermal autofluorescence, dermal collagen second harmonic generation (SHG), and the redox state of solar-exposed and solar-protected human skin by MPT with fluorescence lifetime imaging (MPT-FLIM). Twenty-four volunteers across four age categories (20 to 29, 30 to 39, 40 to 49, and 50 to 59 years old; six volunteers each) were recruited for MPT-FLIM imaging of the dorsal (solar-exposed; photo-damaged) and volar (solar-protected) forearm. We demonstrate a higher intensity of dermal collagen SHG within the volar forearm compared to dorsal solar-exposed skin. Redox imaging of each epidermal skin stratum by FLIM demonstrates an increase in fluorescence lifetime in the solar-exposed dorsal forearm that is more apparent in aged skin. The results of this study suggest the redox state of the viable epidermis is a key marker in assessing intrinsic and photo-damage skin aging, in combination with changes in autofluorescence and SHG.

Paper Details

Date Published: 27 November 2012
PDF: 12 pages
J. Biomed. Opt. 18(6) 061217 doi: 10.1117/1.JBO.18.6.061217
Published in: Journal of Biomedical Optics Volume 18, Issue 6
Show Author Affiliations
Washington Y. Sanchez, The Univ. of Queensland School of Medicine (Australia)
Clara Obispo, Institut Polytechnique Lasalle-Beauvais (France)
Elizabeth Ryan, The Univ. of Queensland School of Medicine (Australia)
Jeffrey Grice, The Univ. of Queensland School of Medicine (Australia)
Michael S. Roberts, The Univ. of Queensland School of Medicine (Australia)

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