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. Author manuscript; available in PMC: 2011 Dec 1.
Published in final edited form as: Nanomedicine (Lond). 2010 Dec;5(10):1535–1546. doi: 10.2217/nnm.10.90

Figure 4. Apoptosis assays of HN12 head and neck cancer cells treated with single-walled carbon nanotubes and PEGylated single-walled carbon nanotubes.

Figure 4

Analysis by the Annexin-V assay and subsequent flow cytometry revealed no significant deviation of the percentage of early-stage apoptotic cells among the experimental groups and negative control. Conversely, approximately 100% of the cells irradiated with γ-radiation were apoptotic, serving as a positive control. Concentrations of SWCNT and PEG-SWCNT were 0.5 mg ml−1. The assay was performed 24 h postapplication. Control: Cells only; GI: γ-irradiation control; PEG: Polyethylene glycol; SWCNT: Single-wall carbon nanotube.