Interaction between Fluorescent Nanodiamond and Human Transferrin and Intracellular Imaging

doi:10.6023/A13010148

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (05): 782-786.DOI: 10.6023/A13010148 Previous Articles Next Articles

Article

荧光纳米钻石与转铁蛋白的相互作用及其在细胞内的成像应用

王东新^a,b, 李英奇^a,c, 杨斌盛^a

a 山西大学分子科学研究所化学生物学与分子工程教育部重点实验室太原 030006;
b 山西医科大学公共卫生学院太原 030001;
c 山西大学化学化工学院太原 030006

投稿日期:2013-01-31 发布日期:2013-03-15
通讯作者: 李英奇,wkyqli@sxu.edu.cn;杨斌盛,yangbs@sxu.edu.cn E-mail:wkyqli@sxu.edu.cn;yangbs@sxu.edu.cn
基金资助:
项目受国家自然科学基金(No. 21071091)、山西省自然科学基金(No. 2009011012-3)、山西省归国留学基金(No. 201011)和山西医科大学青年基金(No. 02201114)资助.

Interaction between Fluorescent Nanodiamond and Human Transferrin and Intracellular Imaging

Wang Dongxin^a,b, Li Yingqi^a,c, Yang Binsheng^a

a Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, China;
b Public Health College, Shanxi Medical University, Taiyuan 030001, China;
c College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China

Received:2013-01-31 Published:2013-03-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 21071091), the Shanxi Provincial Natural Science Foundation (Grant No. 2009011012-3), Shanxi Scholarship Council of China (201011) and the Youth Foundation of Shanxi Medical University (02201114).

1. Interaction between Fluorescent Nanodiamond and Human Transferrin and Intracellular Imaging.PDF(111KB)

Abstract

Nanodiamond (ND), as a member of carbon nanomaterials family, has recently received increasing attention for their potential applications as imaging and drug delivery agents. Due to several charming properties, such as surface functionalization capability, biocompatibility and chemical stability, ND demonstrates high affinity to biomolecules. In this work, the adsorptive behavior of oxidized fluorescent nanodiamond (FND, with a size of ca. 140 nm) for hTf was investigated. The amount of surface carboxylic acid on oxidized FND was 126 μmol/g determined by conductometric backward titration. This amount is 29.7% of the total surface atoms. HTf physically adsorbed on the surface of FND (FND-hTf) in PBS (pH7.4) shows that the isothermyal adsorption behavior is coincident with Langmuir model and the maximum adsorbed amount is (176.46±2.13) μg/mg. ND coated human transferrin (hTf) can improve the dispersity and stability compared to pristine FND under a physiological environment or in cell culture medium observed through optical microscope and be more suitable for biomedicine applications. Simultaneously, pH effect on hTf adsorbed onto FND is also inquiried. The result exhibits that FND has the greatest adsorption capacity for hTf close to the isoelectric point. Owing to the negatively charged nitrogen- vacancy (N-V)^- defect centers, FND can absorb strongly at ca. 560 nm and emit fluorescence efficiently at ca. 700 nm, which can be well quantitatively and qualitatively analyzed by flow cytometry and confocal fluorescence images. In vitro experiments of human liver cancer cells (HepG2) uptake of nanoparticles display that FND-hTf nanoparticles are more easily endocytosed than that of pristine FND. So FND-hTf is conducive to cell imaging. Furthermore, flow cytometry assay indicates cellular uptake of FND-hTf reached a plateau at about 8 h and the uptake half-life is about (1.41±0.22) h at a particle concentration of 100 μg/mL. The results obtained by confocal fluorescent images display that the FND-hTf nanoparticles locate in the cytoplasm and mainly distribute on the surface of the nucleus, however, can not enter the nucleus.

Key words: fluorescent nanodiamond, human transferrin, Langmuir isothermy adsorption, cell imaging

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Wang Dongxin, Li Yingqi, Yang Binsheng. Interaction between Fluorescent Nanodiamond and Human Transferrin and Intracellular Imaging[J]. Acta Chimica Sinica, 2013, 71(05): 782-786.

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荧光纳米钻石与转铁蛋白的相互作用及其在细胞内的成像应用

Interaction between Fluorescent Nanodiamond and Human Transferrin and Intracellular Imaging

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