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• W170190512 abstract "Human serum albumin (HSA) nanoparticles represent a promising tool for targeted drug delivery to tumor cells. The coupling of the antibody trastuzumab to nanoparticles uses the capability of human epidermal growth factor receptor 2 (HER2)-positive cells to incorporate agents linked to HER2. In our present study, we developed targeted nanoparticles loaded with antisense oligonucleotides (ASOs) against polo-like kinase 1 (Plk1). We evaluated the receptor-mediated uptake into HER2-positive and -negative breast cancer and murine cell lines. We performed quantitative real-time PCR and Western blot analyses to monitor the impact on Plk1 expression in HER2-positive breast cancer cells. Antibody-conjugated nanoparticles showed a specific targeting to HER2-overexpressing cells with cellular uptake by receptor-mediated endocytosis and a release into HER2-positive BT-474 cells. We observed a significant reduction of Plk1 mRNA and protein expression and increased activation of Caspase 3/7. Thus, this is the first report about ASO-loaded HSA nanoparticles, where an impact on gene expression could be observed. The data provide the basis for the further development of carrier systems for Plk1-specific ASOs to reduce off-target effects evoked by systemically administered ASOs and to achieve a better penetration into primary and metastatic target cells. Treatment of tumors using trastuzumab-conjugated ASO-loaded HSA nanoparticles could be a promising approach to reach this goal." @default.
• W170190512 created "2016-06-24" @default.
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• W170190512 date "2008-03-01" @default.
• W170190512 modified "2023-09-26" @default.
• W170190512 title "Downregulation of Plk1 Expression By Receptor-Mediated Uptake of Antisense Oligonucleotide-Loaded Nanoparticles" @default.
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• W170190512 doi "https://doi.org/10.1593/neo.07916" @default.
• W170190512 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2259452" @default.
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• W170190512 hasPublicationYear "2008" @default.
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