Preparation of PEOz-modified single-walled carbon nanotube paclitaxel delivery system and evaluation of its anti-tumor effect in vitro / 中草药

Objective: To prepare a PEOz modified single-walled carbon nanotube delivery system (PEOz-SWCNT) with the anti- tumor drug paclitaxel (PTX) as a model drug (PTX@PEOz-SWCNT) and evaluate its physical and chemical properties, in vitro drug release, biocompatibility, and in vitro antitumor effects. Methods: PEOz-SWCNT was synthesized by chemical coupling method, and the products were characterized by UV-Vis spectroscopy (UV-Vis) and infrared spectroscopy (FTIR). The particle size and Zeta potential of PEOz-SWCNT were measured. The drug-loaded complex PTX@PEOz-SWCNT was prepared and the loading efficiency and encapsulation efficiency were measured. The dialysis method was used for in vitro drug release. The safety of the application of PEOz-SWCNT was evaluated by in vitro hemolysis test. The MTT method was used to evaluate the biocompatibility of the material and the growth inhibition rate of the drug-loaded complex on MCF-7 cells. The uptake of Coumarin-6 (C6)-labeled vector in MCF-7 cells was examined by fluorescence inversion microscope. Results: The average particle size of PEOz-SWCNT was (219.8 ± 2.9) nm and the Zeta potential was (-35.23 ± 0.74) mV. The loading efficiency of PTX@PEOz-SWCNT was (38.19 ± 0.74) %, and the encapsulation efficiency was (94.38 ± 0.94)%. The drug release rate was significantly accelerated at pH 5.0, showing obvious pH responsiveness. There was no obvious hemolysis when the concentration of PEOz-SWCNT was below 0.4 mg/mL. The biocompatibility of PEOz-SWCNT on Hela cells was good, and the PTX@PEOz-SWCNT could significantly enhance the cell growth inhibition rate on MCF-7 cells. The in vitro antitumor activity test results showed that the cell uptake of the C6@PEOz-SWCNT was increased compared to C6@SWCNT. Conclusion: PTX@PEOz-SWCNT drug delivery system is promising in tumor-targeted drug delivery.

Carbon nanotubes as a novel drug delivery system for anticancer therapy: a review

Carbon nanotubes (CNTs) were discovered in 1991 and shown to have certain unique physicochemical properties, attracting considerable interest in their application in various fields including drug delivery. The unique properties of CNTs such as ease of cellular uptake, high drug loading, thermal ablation, among others, render them useful for cancer therapy. Cancer is one of the most challenging diseases of modern times because its therapy involves distinguishing normal healthy cells from affected cells. Here, CNTs play a major role because phenomena such as EPR, allow CNTs to distinguish normal cells from affected ones, the Holy Grail in cancer therapy. Considerable work has been done on CNTs as drug delivery systems over the last two decades. However, concerns over certain issues such as biocompatibility and toxicity have been raised and warrant extensive research in this field.

Os nanotubos de carbono foram descobertos em 1991 e suas propriedades físico-químicas únicas demonstradas, despertando interesse em sua aplicação em vários campos, incluindo a entrega liberação de fármacos. As propriedades únicas dos nanotubos de carbono, tais como a facilidade de captação pela célula, carga alta de fármaco, ablação térmica, entre outras, tornaram-nos úteis para terapia de câncer, uma das doenças mais difíceis dos tempos modernos, pois sua terapia envolve a distinção entre as células normais saudáveis e as afetadas pela doença. Os nanotubos de carbono têm um papel importante nessa área porque fenômenos como EPR permitem que estes possam distinguir as células normais das afetadas, que é o Santo Graal na terapia do câncer. Trabalho considerável tem sido feito ao longo das duas últimas década com nanotubos de carbono, como sistemas de liberação de fármacos. No entanto, preocupações sobre algumas questões, como biocompatibilidade e toxicidade, surgiram ao longo do tempo, demandando extensas pesquisa nesse campo.

Pulmonary Toxicity of Three Typical Nanomaterials Caused by Intratracheal Instillation in Rats / 环境与健康杂志

Objective To investigate the toxic effect of nona-ferroso-ferric oxide(Nano-Fe_3O_4),nano-silicon dioxide(Nano- SiO_2)and single walled carbon nanotubes(SWCNTs)on the lung and mechanism in rats.Methods Fourty-nine Wistar rats were randomly divided into 7 groups,the control group,low and high dose groups of three nanomaterials.The rats were exposed by intratracheal instillation once two days for 5 weeks,and then killed by abdominal aorta bloodletting.The pathology of lung,lactate dehydrogenase(LDH),total antioxidant capacity(T-AOC),superoxide dismutase(SOD),malondialdehyde(MDA),interleukin-1(IL- l),interleukin-6(IL-6)and tumor necrosis factor-?(TNF-?)in bronchoalveolar lavage fluid(BALF)were determined.Results The fibrous tubercle and the matrix inflammation of lung tissue was found in the experimental groups.The activities of T-AOC and SOD decreased while IL-6 concentration increased significantly in the experimental groups(P