Figure 3

Influence of dispersion medium on the in vitro effect of MWCNT on fibroblast proliferation assessed by cell counting. Primary murine lung fibroblasts were treated for 24 h with different doses of NM400 dispersed in 2 or 10% FBS or 1.4 mg/ml BSA (final concentrations 0.2% FBS and 0.14 mg/ml BSA, respectively). PDGF-BB (50 ng/ml) was used as a positive control. Results are expressed relative to non-treated cell number (Ctl). * p < 0.05, ** p < 0.01 vs non-treated cells (n = 3, t-test or Dunnet multiple comparison test as appropriate).