Fig. 7.
IL-6 secretion by human astrocytoma cell line U87 after PRP (a) and NP (b) treatment. U87 cells (3 × 105/ml) were cultured in the presence of PRP (0.1 and 10 μg/ml) or NP (0.1 and 10 μg/ml) for 24 h. TNFα (50 pg/ml) was used as reference sample. Supernatants were harvested and analyzed for IL-6 level by ELISA as described in Materials and Methods. Results are presented as median ± quartile (25–75 %) and min–max (n = 5). *p ≤ 0.05. Statistically significant difference in value versus control