Author/Authors :
Phillips, CL University of the Witwatersrand - School of Chemical and Metallurgical Engineering, South Africa , Yah, CS University of the Witwatersrand - School of Chemical and Metallurgical Engineering, South Africa , Iyuke, SE University of the Witwatersrand - School of Chemical and Metallurgical Engineering, South Africa , Pillay, V University of the Witwatersrand - School of Therapeutic Sciences - Department of Pharmacy and Pharmacology, South Africa , Rumbold, K University of the Witwatersrand - School of Molecular Cell Biology, South Africa , Choonara, Y University of the Witwatersrand - School of Therapeutic Sciences - Department of Pharmacy and Pharmacology, South Africa , phillips, c.l. school of chemical and metallurgical engineering,university of the witwatersrand,johannesburg,p/ bag 3, South Africa , yah, c.s. school of chemical and metallurgical engineering,university of the witwatersrand,johannesburg,p/ bag 3, South Africa , iyuke, s.e. school of chemical and metallurgical engineering,university of the witwatersrand,johannesburg,p/ bag 3, South Africa , pillay, v. department of pharmacy and pharmacology,school of therapeutic sciences,university of the witwatersrand,7 york road,parktown, South Africa , rumbold, k. school of molecular and cell biology,university of the witwatersrand,johannesburg,p/bag 3, South Africa , choonara, y. department of pharmacy and pharmacology,school of therapeutic sciences,university of the witwatersrand,7 york road,parktown, South Africa
Abstract :
Background: The applications of oxidized carbon nanotubes (o-CNTs) have shown potentials in novel drug delivery including the brain which is usually a challenge. This underscores the importance to study its potential toxic effect in animals. Despite being a promising tool for biomedical applications little is known about the safety of drugs in treating brain diseases. The toxicity of oxidized multi-walled carbon nanotubes (o-MWCNTs) are of utmost concern and in most in-vitro studies conducted so far are on dendritic cell (DC) lines with limited data on PC12 cell lines. Objectives: We focused on the effect of o-MWCNTs in PC12 cells in vitro: a common model cell for neurotoxicity. Methods: The pristine multi-walled carbon nanotubes (p-MWCNTs) were produced by the swirled floating catalytic chemical vapour deposition method (SFCCVD). The p-MWCNTs were then oxidized using purified H2SO4/HNO3 (3:1v/v) and 30% HNO3 acids to produce o-MWCNTs. The Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), Scanning electron microscopy (SEM), thermogravimetric analyser (TGA) and Raman spectroscopy techniques were used to characterize the MWCNTs. The PC12 cells were cultured in RPMI medium containing concentrations of o-MWCNTs ranging from 50 to 200 μg/ml. Results: The o-MWCNTs demonstrated slight cytotoxicity at short time period to PC12 neuronal cells whilst at longer time period, no significant (p 0.05) toxicity was observed due to cell recovery. Conclusion: In conclusion, the o-MWCNTs did not affect the growth rate and viability of the PC12 cells due to lack of considerable toxicity in the cells during the observed time period but further investigations are required to determine cell recovery mechanism.
