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Abstract
Photodynamic therapy is a novel clinical treatment for malignant tumors, and has recently been extended to anti-bacteria and anti-virus applications. Phthalocyanine photosensitizers possess good photosensitization properties, but their high hydrophobicity and lack of targeting capabilities limit their application. By conjugating a pentalysine peptidyl moiety to hydrophobic phthalocyanine, a novel photosensitizer (ZnPc(Lys)5) was synthesized. This review systematically summarizes the design, development, safety and characterization of ZnPc(Lys)5, and describes its applications and mechanisms in anti-tumor, anti-bacterial and anti-viral areas, as well as exploring its prospects for applications beyond photodynamic therapy. This review demonstrates that the peptide conjugation is an effective strategy for enhancing water solubility and broadens the applications of phthalocyanine-type photosensitizers. Furthermore, the importance of dynamic balance between the monomeric and aggregate conformations of phthalocyanine underlying its photodynamic effect is highlighted, providing a fresh perspective for the design and application of photosensitizers.
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