Peroxisome Proliferator-activated Receptor-γ-independent Inhibition of Macrophage Activation by the Non-thiazolidinedione Agonist L-796,449

The effects of L-796,449 (3-chloro-4-(3-(3-phenyl-7-propylbenzofuran-6-yloxy)propylthio)phenylacetic acid; referred to henceforth as compound G), a thiazolidinedione-unrelated peroxisome proliferator activated-receptor-γ (PPAR-γ) agonist, on early signaling in lipopolysaccharide-activated RAW 264.7 macrophages were analyzed and compared with those elicited by 15-deoxy-Δ12,14-prostaglandin J2 and the thiazolidinedione rosiglitazone. Compound G inhibited the activation of nuclear factor κB through the impairment of the targeting and degradation of IκB proteins and promoted a redistribution of IκBα and IκBβ in the nucleus of activated cells. Compound G inhibited IκB kinase (IKK) activity both in vivo and in vitro, suggesting a direct mechanism of interaction between this molecule and the IKK complex. The effect of compound G on IKK activity was independent of PPAR-γ engagement because RAW 264.7 cells expressed negligible levels of this nuclear receptor, and rosiglitazone failed to mimic these actions. Moreover, treatment of activated macrophages with compound G enhanced the synthesis of superoxide anion, which, in combination with the NO produced under activation conditions, triggered apoptosis through the intracellular synthesis of peroxynitrite. These results suggest that compound G might contribute to the resolution of inflammation by favoring the induction of apoptosis through mechanisms independent of PPAR-γ engagement.

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