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• W2897926811 abstract "BackgroundWe have developed ultrasmall porphyrin–high-density lipoprotein (HDL) nanoparticles (<20 nm), called “porphyrinHDL,” that have a high density of porphyrin molecules and dissociate rapidly upon tumor cell accumulation to become fluorescent and photoactive. This is introduced as a novel activatable photosensitizer for image-guided photodynamic therapy (PDT). Here, we report the studies of these nanoparticles targeted to scavenger receptor class B type I (SR-BI) expressed on lung cancer cells as a first step toward development of a minimally invasive treatment for peripheral lung cancer and metastatic lymph nodes of advanced lung cancer.MethodsThe in vitro uptake of porphyrinHDL and the corresponding PDT efficacy were evaluated in both SR-BI–positive and SR-BI–negative lung cancer cell lines. A clinically relevant orthotopic lung cancer model in mice was used to examine fluorescence activation and quantification of uptake in tumor. In addition, we investigated the effect of porphyrinHDL-mediated PDT.ResultsPorphyrinHDL promoted proper intracellular uptake in the H460 human lung cancer cell line. When irradiated with a 671-nm PDT laser, porphyrinHDL produced significant therapeutic effectiveness in vitro. After systemic administration in mice with orthotopic lung cancer xenografts, porphyrinHDL demonstrated selective accumulation and photoactivation in tumor with significantly enhanced disease-to-normal tissue contrast. Moreover, porphyrinHDL-PDT significantly induced cell apoptosis in lung tumors (73.2%) without toxicity in normal tissues or damage to adjacent critical structures.ConclusionsSR-BI–targeted porphyrinHDL-mediated PDT of lung cancer is selective and effective in vitro and in vivo. These initial proof-of-principle studies suggest the potential of a “smart” PDT approach for highly selective tumor ablation. We have developed ultrasmall porphyrin–high-density lipoprotein (HDL) nanoparticles (<20 nm), called “porphyrinHDL,” that have a high density of porphyrin molecules and dissociate rapidly upon tumor cell accumulation to become fluorescent and photoactive. This is introduced as a novel activatable photosensitizer for image-guided photodynamic therapy (PDT). Here, we report the studies of these nanoparticles targeted to scavenger receptor class B type I (SR-BI) expressed on lung cancer cells as a first step toward development of a minimally invasive treatment for peripheral lung cancer and metastatic lymph nodes of advanced lung cancer. The in vitro uptake of porphyrinHDL and the corresponding PDT efficacy were evaluated in both SR-BI–positive and SR-BI–negative lung cancer cell lines. A clinically relevant orthotopic lung cancer model in mice was used to examine fluorescence activation and quantification of uptake in tumor. In addition, we investigated the effect of porphyrinHDL-mediated PDT. PorphyrinHDL promoted proper intracellular uptake in the H460 human lung cancer cell line. When irradiated with a 671-nm PDT laser, porphyrinHDL produced significant therapeutic effectiveness in vitro. After systemic administration in mice with orthotopic lung cancer xenografts, porphyrinHDL demonstrated selective accumulation and photoactivation in tumor with significantly enhanced disease-to-normal tissue contrast. Moreover, porphyrinHDL-PDT significantly induced cell apoptosis in lung tumors (73.2%) without toxicity in normal tissues or damage to adjacent critical structures. SR-BI–targeted porphyrinHDL-mediated PDT of lung cancer is selective and effective in vitro and in vivo. These initial proof-of-principle studies suggest the potential of a “smart” PDT approach for highly selective tumor ablation." @default.
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• W2897926811 date "2019-02-01" @default.
• W2897926811 modified "2023-10-18" @default.
• W2897926811 title "Porphyrin–High-Density Lipoprotein: A Novel Photosensitizing Nanoparticle for Lung Cancer Therapy" @default.
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• W2897926811 doi "https://doi.org/10.1016/j.athoracsur.2018.08.053" @default.
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