tailieunhanh - báo cáo khoa học: "Dynamics and mechanisms of quantum dot nanoparticle cellular uptake"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Dynamics and mechanisms of quantum dot nanoparticle cellular uptake | Xiao et al. Journal of Nanobiotechnology 2010 8 13 http content 8 1 13 RESEARCH JOURNAL OF NANOBIOTECHNOLOGY Open Access Dynamics and mechanisms of quantum dot nanoparticle cellular uptake Yan Xiao 1 Samuel P Forry1 Xiugong Gao2 R David Holbrook1 William G Telford3 and Alessandro Tona1 4 Abstract Background The rapid growth of the nanotechnology industry and the wide application of various nanomaterials have raised concerns over their impact on the environment and human health. Yet little is known about the mechanism of cellular uptake and cytotoxicity of nanoparticles. An array of nanomaterials has recently been introduced into cancer research promising for remarkable improvements in diagnosis and treatment of the disease. Among them quantum dots QDs distinguish themselves in offering many intrinsic photophysical properties that are desirable for targeted imaging and drug delivery. Results We explored the kinetics and mechanism of cellular uptake of QDs with different surface coatings in two human mammary cells. Using fluorescence microscopy and laser scanning cytometry LSC we found that both MCF-7 and MCF-10A cells internalized large amount of QD655-COOH but the percentage of endocytosing cells is slightly higher in MCF-7 cell line than in MCF-10A cell line. Live cell fluorescent imaging showed that QD cellular uptake increases with time over 40 h of incubation. Staining cells with dyes specific to various intracellular organelles indicated that QDs were localized in lysosomes. Transmission electron microscopy TEM images suggested a potential pathway for QD cellular uptake mechanism involving three major stages endocytosis sequestration in early endosomes and translocation to later endosomes or lysosomes. No cytotoxicity was observed in cells incubated with nM of QDs for a period of 72 h. Conclusions The findings presented here provide information on the mechanism of QD endocytosis that could be exploited to reduce non-specific .

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