张学农教授课题组在Nanomedicine: Nanotechnology, Biology and Medicine(一区，IF 6.69)发表论文

N-trimethyl chitosan nanoparticle-encapsulated lactosyl-norcantharidin for liver cancer therapy with high targeting efficacy

Min Guan(管敏), Yi Zhou（周奕）,Qiao-Ling Zhu（朱巧玲）,Yang Liu（刘扬）,Yong-Yan Bei(贝永燕), Xue-Nong Zhang*（张学农）, Qiang Zhang（张强）

Nanomedicine:NBM, 2012,8:1172-1181

Abstract:  N-Trimethyl chitosan (TMC) was synthesized and used to prepare lactosyl- norcantharidin TMC nanoparticles (Lac-NCTD-TMC-NPs) using an ionic cross-linkage process. Lac-NCTD-TMC-NPs with an average particle size of 120.6 ± 1.7 nm were obtained, with an entrapment efficiency of 69.29% ± 0.76%, and a drug-loading amount of 9.1% ± 0.07%. The release of Lac-NCTD-TMC-NPs in vitro was investigated through a dialysis method, and its sustained effect was evident. In the human liver cancer cell line HepG2, the half-maximum inhibiting concentration (IC₅₀) of TMC-encapsulated Lac-NCTD (Lac-NCTD-TMC-NPs) was only 24.2% that of free Lac-NCTD at 24 hours. Lac-NCTD induced HepG2 cell death by triggering apoptosis. In vitro cellular uptake and in vivo NIR fluorescence real-time imaging both indicated a high targeting efficacy. In comparison with Lac-NCTD and Lac-NCTD chitosan NPs (Lac-NCTD-CS-NPs ), Lac-NCTD-TMC-NPs had the strongest antitumor activity on the murine hepatocarcinoma 22 subcutaneous model