In Vitro Evaluation of Doxorubicin Conjugates Based on Sugar Core Nonlinear Polymethacrylates toward Anticancer Drug Delivery

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• 作者：A. Mielańczyk ; M. Skonieczna ; Ł. Mielańczyk ; D. Neugebauer
• 刊名：Bioconjugate Chemistry
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：27
• 期：4
• 页码：893-904
• 全文大小：668K
• 年卷期：0
• ISSN：1520-4812

文摘

V-shaped and star-shaped hydroxylamine-functionalized polymethacrylates designed as nanosized conjugates (<120 nm) with anticancer agent, namely, doxorubicin (DOX), were evaluated in vitro toward their potential usage as drug delivery systems in breast cancer (MCF-7) treatment. Statistical analysis of MTS assay results showed that the 4-arm conjugate (n_DOX = 16) was the most effective polymeric system against MCF-7/W (wild type) and MCF-7/R (DOX resistant) cell lines. Apoptosis assay analysis showed that MCF-7/R cells cultured with nonlinear copolymers died due to necrosis and late apoptotis, whereas MCF-7/W cells were in early and late apoptosis. Among all tested conjugates, the most promising results with induction of apoptosis without inducing necrosis in both MCF-7 cell lines were obtained for conjugate based on 4-arm stars with low content of DOX. The cell cycle assay revealed that increase of MMA units in 4-arm copolymers induced MCF-7/R cell arrest in the SubG1 phase. In the same cell line, the corresponding conjugates triggered S and G2/M arrest. Gradual internalization of the chosen conjugate by MCF-7/R cells was monitored via fluorescence microscopy showing its main localization in the cytoplasm.