4-cyano-N-[4-(4-methyl-1-piperazinyl)-2-(4-methyl-1-piperidinyl)phenyl]-1H-pyrrole-2-carboxamide and Inflammation

A series of pyrido[2,3-d]pyrimidin-5-ones has been synthesized and evaluated as inhibitors of the kinase domain of macrophage colony-stimulating factor-1 receptor (FMS). FMS inhibitors may be useful in treating rheumatoid arthritis and other chronic inflammatory diseases. Structure-based optimization of the lead amide analogue 10 led to hydroxamate analogue 37, which possessed excellent potency and an improved pharmacokinetic profile. During the chronic phase of streptococcal cell wall-induced arthritis in rats, compound 37 (10, 3, and 1 mg/kg) was highly effective at reversing established joint swelling. In an adjuvant-induced arthritis model in rats, 37 prevented joint swelling partially at 10 mg/kg. In this model, osteoclastogenesis and bone erosion were prevented by low doses (1 or 0.33 mg/kg) that had minimal impact on inflammation. These data underscore the potential of FMS inhibitors to prevent erosions and reduce symptoms in rheumatoid arthritis.

Topics: Animals; Anti-Inflammatory Agents; Arthritis, Rheumatoid; Bone Resorption; Disease Models, Animal; Inflammation; Osteoclasts; Pharmacokinetics; Protein Kinase Inhibitors; Protein Structure, Tertiary; Pyrimidinones; Rats; Receptor, Macrophage Colony-Stimulating Factor; Structure-Activity Relationship