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Research Article Open access CC BY 4.0

Application of Peptide-Conjugated Photosensitizers for Photodynamic Cancer Therapy: A Review

Nuno Vale, Raquel Ramos, Inês Cruz, Mariana Pereira

Organics · pp. 429–442 · Published 21 Oct 2024

10.3390/org5040022

Abstract

Photodynamic therapy (PDT) is a clinically approved therapeutic option for the treatment of various types of cancer. PDT calls for the application of photosensitizers (PSs) and photoactivation with a particular light wavelength while tissue oxygen is present. Anticancer efficacy depends on the combination of these three substrates leading to the generation of cytotoxic reactive oxygen species (ROS) that promote apoptosis, necrosis, and autophagy of cancer cells. However, one of the biggest problems with conventional PDT is the poor accumulation and targeting of PSs to tumor tissues, resulting in undesirable side effects and unfavorable therapeutic outcomes. To overcome this, new photosensitizers have been developed through bioconjugation and encapsulation with targeting molecules, such as peptides, allowing a better accumulation and targeting in tumor cells. Several studies have been conducted to test the efficacy of several peptide-conjugated photosensitizers and improve PDT efficacy. This review aims to present current insights into various types of peptide-conjugated photosensitizers, with the goal of enhancing cancer treatment efficacy, addressing the limitations of conventional PDT, and expanding potential applications in medicine.

Photodynamic therapy Cancer Conjugated system Peptide Cancer therapy Cancer research Medicine Chemistry

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