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Photodynamic therapy targeting VCAM-1-expressing human umbilical vein endothelial cells using a PpIX-VCAM-1 binding peptide-quantum dot conjugate
KTH, School of Engineering Sciences (SCI), Applied Physics, Cellular Biophysics.
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2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 80, p. 50562-50570Article in journal (Refereed) Published
Abstract [en]

With increasing knowledge of the relevance of vascular cell adhesion molecule 1 (VCAM-1) for tumor growth, metastasis, angiogenesis, and related processes, it has become an attractive anti-tumor strategy to target VCAM-1 expression on the tumor vasculature. We designed a new targeted nanodrug, denoted PVQ, based on a photosensitizer (for the photodynamic effect), VCAM-1 target and quantum dot (QD) carrier, using conjugated water-dispersible colloidal CdSe-CdS/ZnS QDs, protoporphyrin IX (PpIX) photosensitizers, and VCAM-1 binding peptides. Its targeting ability and photodynamic therapy (PDT) efficiency against VCAM-1 expression in human umbilical vein endothelial cells (HUVECs) were then investigated. Conjugates of QD-VCAM-1 binding peptide (VQ), PpIX-VCAM-1 binding peptide (PV), and PVQ prepared using amide coupling were verified by agarose gel electrophoresis, Fourier transform infrared spectroscopy, and fluorescence spectrometry. VCAM-1 expression in HUVECs was induced by TNF-alpha treatment. PVQ conjugates were co-cultured with VCAM-1 expressing (VCAM-1(+)) and non-expressing (VCAM-1(-)) HUVECs, and target imaging, ROS generation, cell death, and apoptosis were analyzed using confocal fluorescence microscopy. VCAM-1 target imaging could not distinguish between VCAM-1(+) and VCAM-1(-) HUVECs after only 6 h of incubation; however it could distinguish between the cells after incubation for 24 h. After incubation for ca. 30 min, PVQ generated a significantly higher yield of ROS (3.6 fold) in VCAM-1(+) HUVECs compared with VCAM-1(-) cells, during 10 min of irradiation at a wavelength of 405 nm, and this was followed by a second rise in ROS at 30 min after irradiation. Moreover, cell destruction was observed clearly in VCAM-1(+) cells treated with PVQ and almost all cells became round after 30 min of irradiation at 405 nm. PVQ-induced PDT effects caused a significant apoptosis (onset and late apoptosis) in VCAM-1(+) HUVECs at 6 h after PDT treatment. In conclusion, PVQ shows a great potential for targeted PDT in cancer therapy.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 7, no 80, p. 50562-50570
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Medical Biotechnology
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URN: urn:nbn:se:kth:diva-217962DOI: 10.1039/c7ra10648cISI: 000414405800017Scopus ID: 2-s2.0-85032949946OAI: oai:DiVA.org:kth-217962DiVA, id: diva2:1158703
Note

QC 20171121

Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-29Bibliographically approved

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Yin, HuijuanFu, Ying

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