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10.1038/s41598-017-14709-x

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C5676682!5676682!29116108
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suck abstract from ncbi


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pmid29116108      Sci+Rep 2017 ; 7 (ä): ä
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  • Precision Targeting of Tumor Macrophages with a CD206 Binding Peptide #MMPMID29116108
  • Scodeller P; Simón-Gracia L; Kopanchuk S; Tobi A; Kilk K; Säälik P; Kurm K; Squadrito ML; Kotamraju VR; Rinken A; De Palma M; Ruoslahti E; Teesalu T
  • Sci Rep 2017[]; 7 (ä): ä PMID29116108show ga
  • Tumor-associated macrophages (TAMs) expressing the multi-ligand endocytic receptor mannose receptor (CD206/MRC1) contribute to tumor immunosuppression, angiogenesis, metastasis, and relapse. Here, we describe a peptide that selectively targets MRC1-expressing TAMs (MEMs). We performed in vivo peptide phage display screens in mice bearing 4T1 metastatic breast tumors to identify peptides that target peritoneal macrophages. Deep sequencing of the peptide-encoding inserts in the selected phage pool revealed enrichment of the peptide CSPGAKVRC (codenamed ?UNO?). Intravenously injected FAM-labeled UNO (FAM-UNO) homed to tumor and sentinel lymph node MEMs in different cancer models: 4T1 and MCF-7 breast carcinoma, B16F10 melanoma, WT-GBM glioma and MKN45-P gastric carcinoma. Fluorescence anisotropy assay showed that FAM-UNO interacts with recombinant CD206 when subjected to reducing conditions. Interestingly, the GSPGAK motif is present in all CD206-binding collagens. FAM-UNO was able to transport drug-loaded nanoparticles into MEMs, whereas particles without the peptide were not taken up by MEMs. In ex vivo organ imaging, FAM-UNO showed significantly higher accumulation in sentinel lymph nodes than a control peptide. This study suggests applications for UNO peptide in diagnostic imaging and therapeutic targeting of MEMs in solid tumors.
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