nsc 126224

NCI 126224 is a Toll-like receptor 4 (TLR4) antagonist that selectively inhibits nitric oxide production induced by the TLR4 agonist LPS in RAW 264.7 macrophages (IC50 = 0.31 µM), while exhibiting weaker effects against the TLR7/8 agonist R-848, TLR1/2 agonist Pam3CSK4, and TLR3 agonist poly(I:C). NCI 126224 also inhibits FSL-1-induced NO production at 0.6 µM and suppresses LPS-induced NF-κB activity in BV-2 glial cells, while reducing IL-1β and TNF-α levels in RAW 264.7 cells (IC50s of 5.92 and 1.54 µM, respectively). 0.42, and 1.54 µM, respectively), demonstrating its significant value in studies of inflammatory and innate immune signaling pathways.