Psoriasis treatment and multiphoton fluorescence lifetime imaging

[Fred]

This study introduces multiphoton tomography equipped with fluorescence lifetime imaging (MPT-FLIM) as an intravital diagnostic tool to assess the morphological and metabolic course of psoriasis and track drug delivery during topical treatment with calcipotriol and betamethasone dipropionate (C/B) or calcipotriol derivative (C/-)

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Background:
Multiphoton tomography equipped with fluorescence lifetime imaging (MPT-FLIM) is a novel noninvasive imaging technique for analyzing morphological and metabolic states of skin diseases at a subcellular resolution. The present study is the first to establish MPT-FLIM as an imaging modality to monitor treatment response in psoriasis during topical anti-inflammatory therapy.

Materials and Methods:
Patients with psoriasis treated with topical calcipotriol/ betamethasone dipropionate (C/B) or a calcipotriol derivative (C/-) formulation were recruited and monitored using MPT-FLIM. Imaging was performed at baseline on day 0, and during treatment on days 3 and 28.

Results:
A total of six patients prescribed C/B, six patients prescribed C/- and four healthy controls were recruited. Characteristic histological features were visualized, including acanthosis, parakeratosis, papillomatosis, and thinning of the granular layer. There was a strong correlation between clinical, multiphoton tomographic, and pathophysiological improvement during treatment. Assessment of subclinical metabolic changes was a predictive parameter for treatment outcome. Detection of fluorescence signals from drug components allowed for tracking of drug distribution in intra- and intercellular spaces.

Conclusion:
MPT-FLIM proved to be a suitable tool for monitoring treatment response in psoriasis patients and tracking drug delivery. It could be a potential method for monitoring other inflammatory skin diseases during treatment to adjust therapy on an individual level.

Source: onlinelibrary.wiley.com

*Funding: Deutsche Forschungsgemeinschaft & Leo Pharma

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