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• W2015154021 abstract "The bioresponsive conjugate dextrin−phospholipase A2 (PLA2) is a novel anticancer polymer therapeutic. Dextrin conjugation decreases PLA2 bioactivity, but this can be restored following triggered degradation by α-amylase. The conjugate displays reduced hemolytic activity but retains, or shows enhanced, cytotoxicity in vitro that partially correlates with epidermal growth factor receptor (EGFR) expression. Here, we investigate further the mechanism of action of dextrin−PLA2 with the aim of judging its potential for combination with tyrosine kinase inhibitors (TKI) and/or chemotherapy and selecting the first models for in vivo evaluation. The endocytic fate of Oregon Green (OG)-labeled probes was assessed in MCF-7 cells. Whereas PLA2-OG showed greatest membrane binding, the dextrin−PLA2-OG conjugate displayed higher internalization. Moreover, cells incubated with PLA2-OG and dextrin−PLA2-OG showed an altered pattern of intracellular vesicle distribution compared to dextrin−OG. When cell lines known to express different levels of EGFR were used to assess cytotoxicity, free PLA2 activity was enhanced by addition of EGF whereas the conjugate was less cytotoxic, perhaps due to differences in their PK/PD profile. Co-incubation of cells with the TKI inhibitor, gefitinib, led to reduced cytotoxicity of both PLA2 and dextrin−PLA2 suggesting a TK-mediated PLA2 mechanism of action. However, the enhanced cytotoxicity seen in the presence of doxorubicin suggested potential for development of a dextrin−PLA2/doxorubicin combination therapy." @default.
• W2015154021 created "2016-06-24" @default.
• W2015154021 creator A5040979364 @default.
• W2015154021 creator A5065863747 @default.
• W2015154021 creator A5083508995 @default.
• W2015154021 date "2010-03-01" @default.
• W2015154021 modified "2023-09-27" @default.
• W2015154021 title "Studies on the Mechanism of Action of Dextrin−Phospholipase A₂ and Its Suitability for Use in Combination Therapy" @default.
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• W2015154021 doi "https://doi.org/10.1021/mp900232a" @default.
• W2015154021 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20163158" @default.
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