Phenolic hydrazones are potent inhibitors of macrophage migration inhibitory factor proinflammatory activity and survival improving agents in sepsis.

A series of phenolic hydrazones were synthesized and evaluated for their inhibition of macrophage migration inhibitory factor (MIF) tautomerase activity. Compound 7 emerged as a potent inhibitor of MIF with an IC50 of 130 nM. Compound 7 dose-dependently suppressed TNFα secretion from lipopolysaccharide stimulated macrophages. The therapeutic importance of the MIF inhibition by 7 is demonstrated by the significant protection from the lethality of sepsis when administration of the compound was initiated in a clinically relevant time frame.