In vitro toxicity of multi-walled carbon nanotubes in C6 rat glioma cells

► Effects of two different sizes of MWCNT was tested on C6 rat glioma cell line. ► MWCNT induced cytotoxicity on C6 cells in a concentration and time dependent manner. ► The small size of MWCNT seems to be more toxic than that of the larger one. ► Oxidative stress may be responsible for MWCNT-induced cytotoxicity on C6 cell line.