18 research outputs found
Numerical Solution of the Inverse Scattering Problem for the Acoustic Equation in an Absorptive Layered Medium
NSAID Sulindac and Its Analog Bind RXR alpha and Inhibit RXR alpha-Dependent AKT Signaling
Nonsteroidal anti-inflammatory drugs (NSAIDs) exert their anticancer effects through cyclooxygenase-2 (COX-2)-dependent and independent mechanisms. Here, we report that Sulindac, an NSAID, induces apoptosis by binding to retinoid X receptor-alpha (RXR alpha). We identified an N-terminally truncated RXR alpha (tRXR alpha) in several cancer cell lines and primary tumors, which interacted with the p85 alpha subunit of phosphatidylinositol-3-OH kinase (PI3K). Tumor necrosis factor-alpha (TNF alpha) promoted tRXR alpha. interaction with the p85 alpha, activating PI3K/AKT signaling. When combined with TNF alpha, Sulindac inhibited TNF alpha-induced tRXR alpha/p85 alpha interaction, leading to activation of the death receptor-mediated apoptotic pathway. We designed and synthesized a Sulindac analog K-80003, which has increased affinity to RXR alpha but lacks COX inhibitory activity. K-80003 displayed enhanced efficacy in inhibiting tRXR alpha-dependent AKT activation and tRXR alpha tumor growth in animals.National Institutes of Health [CA109345, CA140980, GM089927, GM062848]; Susan G. Komen Breast Cancer Foundation ; California Breast Cancer Research Program ; U.S. Army Medical Research and Material Command ; California Tobacco-Related Diseases Research Program ; Xiamen University ; 863 Program [2007aa09z404]; National Science Foundation [30971445, 30931160431