Drug Delivery Systems for Photodynamic Therapy

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  • 野本 貴大
    Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology,

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  • 光線力学療法を指向したドラッグデリバリーシステム
  • コウセン リキガク リョウホウ オ シコウ シタ ドラッグデリバリー システム

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Abstract

Extending the application of photodynamic therapy (PDT) requires development of photosensitizers (PSs) that can selectively accumulate within target tumors. Although researchers have developed various kinds of PSs in recent years, only a few of them have reached the clinical development stage. This article reviews the characteristics of clinically approved PSs to elucidate the physicochemical properties which are necessary for their practical application and examines recent trends in the development of drug delivery systems (DDSs) for PDT. In addition, this article introduces polymer-PS conjugates developed in our lab which target acidic tumorous pH and the tumor-associated vasculature. Our polymer- PS conjugates exhibited selective tumor accumulation after intravenous injection and a significantly enhanced PDT effect in subcutaneous tumor models. Our DDSs also unveiled important fundamental knowledge in photochemical damage to normal and tumor tissues, which may contribute to the future design of DDSs for PDT.

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