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Article Abstract
A transdermal drug delivery cream, which is non-invasive and painless, containing a liposome-encapsulated Ru(II) complex (LipoRu) is created for the treatment of skin cancer. This formulation capitalizes on the synergistic antitumor effects of two-photon excited photodynamic therapy (PDT), photothermal therapy (PTT), and chemotherapy. LipoRu exhibits effective tumor accumulation, efficient cellular uptake, pH-sensitive and infrared-accelerated release, and dual localization to the nucleus and mitochondria. The released Ru(II) complexes within cells exert multiple antitumor mechanisms, such as DNA topoisomerase and RNA polymerase inhibition, Type I and II PDT, PTT, DNA photodamage, and apoptosis and ferroptosis induction. The biodistribution and therapeutic efficacy of LipoRu in vivo are systematically compared via three distinct administration routes: intratumoral injection, intravenous injection, and transdermal delivery through topical cream application. The positive therapeutic effects of the LipoRu cream fabricated here in subcutaneous tumor-bearing mice offer optimistic potential for the painless and non-invasive treatment of both early-stage and advanced skin cancers, as well as superficially located solid tumors.
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