Potentiation and downregulation of LPS-induced inflammatory response by TSA and helenalin. Exposure time was 24 h at 4 DIV. LPS concentration was 5 μg/ml, TSA concentration was 20 nM and that of helenalin 0.5 μM. Values are means ± SD (n = 6 in each group). * p < 0.05 (Mann-Whitney U test).