Bismuth compounds have been used for treatment of bacterial infection, and recently bismuth nanoparticles (BiNP) were synthesized for imaging and diagnostic purpose, while safety concern of bismuth cannot be ignored. Here, we prepared ultrasmall BiNP and showed an enhanced tumor imaging, but BiNP revealed a differentiated cytotoxicity in human embryonic kidney 293 cells (HEK293) compared to other cell types. For the first time, we found that BiNP can induce autophagy, shown as the increase of monodansylcadaverine fluorescence staining and the amount of LC3II that can be inhibited by 3-MA. BiNP were capable of entering cells in a dose and time dependent manner by fluorescence and element detection methods BiNP were found to be localized in the cytoplasm observed by transmission electron microscopy and intracellular bismuth element confirmed by energy dispersive X-ray analysis. Using endocytic inhibitors, BiNP were found to require ATP and endosomal trafficking pathways for their cellular uptake. Internalized BiNP did not co-localize with EEA1, but co-localized with Lysotracker/LAMP1/LAMP2 at late time points, indicating BiNP may be retained in the non-early endosomal vacuoles and late endosomes. With our novel finding of bismuth induced autophagy and endocytic mechanisms, potential approaches may be applied to reduce the toxicity by bismuth.
[1]Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, Suzhou 215123, Jiangsu, Peoples R China.
[2]Soochow Univ, Collaborat Innovat Ctr Radiat Med Jiangsu Higher, Suzhou 215123, Jiangsu, Peoples R China.
[3]Soochow Univ, Affiliated Hosp 2, 1055 Sanxiang Rd, Suzhou 215004, Jiangsu, Peoples R China.
[4]Soochow Univ, Sch Publ Hlth, Dept Toxicol, Suzhou 215123, Jiangsu, Peoples R China.
[5]Shanghai Univ Tradit Chinese Med, Inst Chinese MateriaMed, Shanghai 201203, Peoples R China.
(8.0+极速模式)