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• W4288456481 abstract "Tumour-targeted near-infrared (NIR) optical imaging is an emerging tool for the detection of malignant tissues. This modality can be useful in both diagnosis and intraoperative visualisation, to help defining tumour margins and allow a more precise removal of all the cancerous mass during surgery. In this context, we have developed a series of NIR fluorescent probes that target the prostate-specific membrane antigen (PSMA), an established biomarker overexpressed in prostate cancer. Four new NIR imaging agents were prepared by conjugating the well-known urea-based PSMA targeting module to the NIR fluorophore Cy7.5, with linkers of 7, 10, 17 and 24 atoms. The affinity of each probe for PSMA was assessed through competitive binding and IC50 measurement in prostate cancer cells, using a previously reported PSMA-targeted NIR probe (i.e. PSMA-IRDye800CW) as reference. The NIR probe PSMA-Cy7.5_2 demonstrated a high affinity for PSMA (i.e. IC50 = 58.8 nM) and was further studied in mouse xenograft models of prostate cancer, to assess its ability to image PSMA positive tumour tissues. While PSMA-Cy7.5_2 out-performed PSMA-IRDye800CW in vitro, its tumour accumulation in vivo was not as evident. Further micellar aggregation studies indicated that the relatively higher hydrophobic property of PSMA-Cy7.5_2 may lower its bioavailability and tissue distribution following systemic injection, limiting its ability of targeting PSMA tumour in vivo. Nevertheless, the excellent binding capability of PSMA-Cy7.5_2 renders this probe a valid lead for further structural optimisation to develop imaging analogues with high affinity and specificity for PSMA, as required for effective NIR fluorescence-guided applications pre-clinically and clinically." @default.
• W4288456481 created "2022-07-29" @default.
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• W4288456481 date "2022-10-01" @default.
• W4288456481 modified "2023-09-28" @default.
• W4288456481 title "PSMA-targeted NIR probes for image-guided detection of prostate cancer" @default.
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• W4288456481 doi "https://doi.org/10.1016/j.colsurfb.2022.112734" @default.
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