Figure 4. Effect of MWCNT on cell apoptosis.

TUNEL technique was used to label DNA strand breaks induced apoptosis. No damaged DNA was detected in vehicle treated or MWCNT treated DRG neuronal cell cultures. The images captured under microscopes from both vehicle treated group and MWCNT treated group were similar to the images from negative control group, which indicated the exposure of MWCNT at dose of 10 μg/ml overnight didn’t increase cell death of DRG neuronal cells. (Scale bar=100 μm).