Different inducers show differential induction of MKP-1. (A) Primary human blood monocytes were stimulated with LPS (50 ng/ml), Pam3Cys (50 ng/ml), or Poly IC (100 μg/ml) for 1 (open bars) and 3 (black bars) hours. Phosphate buffered saline (PBS) was used as a reagent control. RNA was harvested and MKP-1 mRNA was measured by QPCR method. (B) Primary human monocytes were treated with LPS (50 ng/ml) for the indicated time points and RNA samples were harvested. MKP-1 levels were studied by using QPCR. Independent experiments were done on blood cells from 4 different donors, and the results are shown as mean ± SD. * = p < 0.05.