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EC50: 18 nM for TNF-α in THP-1 cells

The signal transduction pathway leading to the production of TNF-α from stimulated inflammatory cells, while not fully understood, has been shown to be partially regulated by p38 mitogen activated protein (MAP) kinase. The p38 MAP kinase plays a crucial role in regulating the production of proinflammatory cytokines. Blocking this kinase may offer an effective therapy for the treatment of many inflammatory diseases. BIRB 796 is a highly potent inhibitor of p38 MAPK.

In vitro: BIRB 796 is a picomolar inhibitor of human p38 MAP kinase with a 12,000-fold increase in binding affinity. Moreover, BIRB 796 behavors as one of the most potent and slowest dissociating human p38 MAP kinase inhibitors now known [1].

In vivo: In a LPS-stimulated TNF-α synthesis mouse model, a 65% inhibition of TNF-α synthesis was observed when BIRB 796 was dosed orally at 10 mg/kg. In a model of established collagen-induced arthritis using B10.RIII mice, BIRB 796 showed a 63% inhibition of arthritis severity when dosed orally at 30 mg/kg qd [2].

Clinical trial: No clinical efficacy (Crohn’s Disease Endoscopic Index of Severity) was seen for BIRB 796 in comparison with placebo. A significant and dose-dependent decrease of C-reactive protein level was seen transiently after BIRB 796 after 1 week with a return to baseline level over time [3].

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