Inhibition of ICAM-1 gene expression, monocyte adhesion and cancer cell invasion by targeting IKK complex: molecular and functional study of novel alpha-methylene-gamma-butyrolactone derivatives

Carcinogenesis
Wei-Chien HuangChing-Chow Chen

Abstract

The transcription factor nuclear factor-kappaB (NF-kappaB) is a regulator related to cellular inflammation, immune responses and carcinogenesis. Therefore, components of the NF-kappaB-activating singnaling pathways are frequent targets for the anti-inflammatory and anticancer agents. In this study, CYL-19 s and CYL-26z, two synthetic alpha-methylene-gamma-butyrolactone derivatives, were shown to inhibit the tumor necrosis factor-alpha (TNF-alpha)-induced intercellular adhesion molecule-1 (ICAM-1) expression in human A549 alveolar epithelial cells and the adhesion of U937 cells to these cells. RT-PCR analysis also demonstrated their inhibitory effects on TNF-alpha-induced ICAM-1 mRNA expression. TNF-alpha-induced ICAM-1 and NF-kappaB-dependent promoter activities were attenuated by CYL-19 s and CYL-26z. ICAM-1 promoter activities induced by the over-expression of wild-type NF-kappaB-inducing kinase and IkappaB kinase beta (IKKbeta) were also inhibited by both compounds. Furthermore, CYL-19 s and CYL-26z inhibited the TNF-alpha-induced phosphorylation and degradation of IkappaBalpha and NF-kappaB-specific DNA-protein binding activity via targeting IKK complex directly, without any effect on the activations of other kinases such a...Continue Reading

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