A Copper-Mediated Disulfiram-Loaded pH-Triggered PEG-Shedding TAT Peptide-Modified Lipid Nanocapsules for Use in Tumor Therapy

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• 作者：Ling Zhang ; Bin Tian ; Yi Li ; Tian Lei ; Jia Meng ; Liu Yang ; Yan Zhang ; Fen Chen ; Haotian Zhang ; Hui Xu ; Yu Zhang ; Xing Tang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25147-25161
• 全文大小：883K
• ISSN：1944-8252

文摘

Disulfiram, which exhibits marked tumor inhibition mediated by copper, was encapsulated in lipid nanocapsules modified with TAT peptide (TATp) and pH-triggered sheddable PEG to target cancer cells on the basis of tumor environmental specificity. PEG-shedding lipid nanocapsules (S-LNCs) were fabricated from LNCs by decorating short PEG chains with TATp (HS-PEG_1k鈥揟ATp) to form TATp-LNCs and then covered by pH-sensitive graft copolymers of long PEG chains (PGA鈥?i>g-PEG_2k). The DSF-S-LNCs had sizes in the range of 60鈥?0 nm and were stable in the presence of 50% plasma. DSF-S-LNCs exhibited higher intracellular uptake and antitumor activity at pH 6.5 than at pH 7.4. The preincubation of Cu showed that the DSF cytotoxicity was based on the accumulation of Cu in Hep G2 cells. Pharmacokinetic studies showed the markedly improved pharmacokinetic profiles of DSF-S-LNCs (AUC= 3921.391 渭g/L路h, t_1/2z = 1.294 h) compared with free DSF (AUC = 907.724 渭g/L路h, t_1/2z = 0.252 h). The in vivo distribution of S-LNCs was investigated using Cy5.5 as a fluorescent probe. In tumor-bearing mice, the delivery efficiency of S-LNCs was found to be 496.5% higher than that of free Cy5.5 and 74.5% higher than that of LNCs in tumors. In conclusion, DSF-S-LNCs increased both the stability and tumor internalization and further increased the cytotoxicity because of the higher copper content.