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The nuclear factor-kappaB (NF-kappaB)-mediated activation of macrophages plays a key role in mucosal immune responses in Crohn’s disease (CD). Moreover, increasing evidence shows that the activation of peroxisome proliferator-activated receptor-gamma (PPAR-gamma) exerts satisfactory anti-inflammatory effects in experimental colitis models, mostly by suppressing NF-kappaB-mediated macrophage activation. Therefore, exploring therapeutic strategies to activate PPAR-gamma and inhibit the NF-kappaB pathway in colonic macrophages holds great promise for the treatment of CD. In this study, five novel pyrazole-containing indolizine derivatives (B1, B2, B3, B4 and B5) were successfully synthesized and characterized, and their anti-inflammatory activities for CD treatment were also investigated. Among the five compounds, compound B4 effectively decreased the NF-kappaB-mediated production of the pro-inflammatory cytokine TNF-alpha in LPS-stimulated peritoneal macrophages. Moreover, compound B4 significantly ameliorated 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced mouse colitis symptoms, including body weight loss, colonic pathological damage and inflammatory cell infiltration. The results of western blotting and luciferase reporter assays indicated that compound B4 activated PPAR-gamma and subsequently suppressed NF-kappaB activation. Conversely, the addition of the PPAR-gamma antagonist GW9662 abrogated the anti-inflammatory effects of compound B4 both in vitro and in vivo. In summary, compound B4 activated the PPAR-gamma pathway to inhibit downstream NF-kappaB signaling, which alleviated experimental colitis. Thus, this compound may serve as a potential therapeutic agent for patients with CD.
Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount108-47-4, you can also check out more blogs about108-47-4
Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis