Photosensitizers and Drug Delivery Systems for Photodynamic Therapy

A special issue of Pharmaceuticals (ISSN 1424-8247). This special issue belongs to the section "Pharmaceutical Technology".

Deadline for manuscript submissions: 25 June 2024 | Viewed by 588

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LRGP, Laboratoire Réactions et Génie des Procédés, UMR 7274 CNRS-Université de Lorraine, 1 rue Grandville, 54000 Nancy, France
Interests: photodynamic therapy; cancer; photosensitizer; nanoparticles; targeting; fluorescence
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Dear Colleagues,

Photodynamic therapy (PDT) is a light-based photochemistry process. The illumination of a photoactivatable molecule, also called photosensitizer, with visible or near-infrared light produces reactive oxygen toxic species to destroy tumor cells. This treatment modality leads to highly targeted actions because reactive oxygen species are produced only where light is applied. Light is not harmful, nor is the photoactivable molecule. Only the combination of three elements, namely a photosensitizer, oxygen, and light, is required to induce photo-oxidation reactions. PDT has proven to be a promising modality in many medical applications, including cutaneous conditions, infectious diseases, and various cancers at different stages.

The journal Pharmaceuticals invites both reviews and original articles shedding light on the challenges and opportunities of the development of innovative photosensitizers and/or drug delivery systems for PDT. Topics include selective photoactivatable molecules targeting receptors overexpressed into tumor membranes and/or on neovessels; molecules exhibiting red-shifted absorption for the better penetration of light into tissues; photobactericidal agents; theranostics; and photodiagnosis.

Dr. Céline Frochot
Guest Editor

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  • photodynamic therapy
  • photosensitizers
  • nanoparticles
  • photo diagnosis
  • targeting
  • antimicrobial
  • X-rays excitation
  • two-photon and up-conversion
  • Cherenkov
  • hypoxia

Published Papers (1 paper)

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18 pages, 1455 KiB  
Comparison of the Differences between Two-Photon Excitation, Upconversion, and Conventional Photodynamic Therapy on Cancers in In Vitro and In Vivo Studies
by Chuanshan Xu, Siu Kan Law and Albert Wing Nang Leung
Pharmaceuticals 2024, 17(6), 663; - 21 May 2024
Viewed by 261
Photodynamic therapy (PDT) is a minimally invasive treatment for several diseases. It combines light energy with a photosensitizer (PS) to destroy the targeted cells or tissues. A PS itself is a non-toxic substance, but it becomes toxic to the target cells through the [...] Read more.
Photodynamic therapy (PDT) is a minimally invasive treatment for several diseases. It combines light energy with a photosensitizer (PS) to destroy the targeted cells or tissues. A PS itself is a non-toxic substance, but it becomes toxic to the target cells through the activation of light at a specific wavelength. There are some limitations of PDT, although it has been used in clinical studies for a long time. Two-photon excitation (TPE) and upconversion (UC) for PDT have been recently developed. A TPE nanoparticle-based PS combines the advantages of TPE and nanotechnology that has emerged as an attractive therapeutic agent for near-infrared red (NIR) light-excited PDT, whilst UC is also used for the NIR light-triggered drug release, activation of ‘caged’ imaging, or therapeutic molecules during PDT process for the diagnosis, imaging, and treatment of cancers. Methods: Nine electronic databases were searched, including WanFang Data, PubMed, Science Direct, Scopus, Web of Science, Springer Link, SciFinder, and China National Knowledge Infrastructure (CNKI), without any language constraints. TPE and UCNP were evaluated to determine if they had different effects from PDT on cancers. All eligible studies were analyzed and summarized in this review. Results: TPE-PDT and UCNP-PDT have a high cell or tissue penetration ability through the excitation of NIR light to activate PS molecules. This is much better than the conventional PDT induced by visible or ultraviolet (UV) light. These studies showed a greater PDT efficacy, which was determined by enhanced generation of reactive oxygen species (ROS) and reduced cell viability, as well as inhibited abnormal cell growth for the treatment of cancers. Conclusions: Conventional PDT involves Type I and Type II reactions for the generation of ROS in the treatment of cancer cells, but there are some limitations. Recently, TPE-PDT and UCNP-PDT have been developed to overcome these problems with the help of nanotechnology in in vitro and in vivo studies. Full article
(This article belongs to the Special Issue Photosensitizers and Drug Delivery Systems for Photodynamic Therapy)
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