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Abstract Smad4 is a key tumor suppressor that is frequently deleted or inactive in pancreatic and colon tumors. In this report, we describe an approach for attaining selective killing of Smad4-deficient tumor cells. Using a vector system involving a designed repressor with zinc finger binding...
Abstract Mammalian cells require specific transport mechanisms for the cellular uptake and release of endogenous nucleosides such as adenosine, and nucleoside analogs used in chemotherapy. We have identified a novel splice variant of the mouse equilibrative nucleoside transporter, mENT1, that...
Abstract The phosphatidylinositol 3-kinase/AKT pathway is activated frequently in human cancer, and it has been implicated in tumor cell proliferation, survival, and chemoresistance. In this study, we addressed the role of AKT in cellular responses to the therapeutic methylating agent...
Abstract Transcriptional changes in response to hypoxia are regulated in part through mitogen-activated protein (MAP) kinase signaling to activator protein 1 (AP-1), and thus contribute to resistance of cancer cells to therapy, including platinum compounds. A key role for JNK in pro-apoptotic...
Abstract Multiple intracellular signaling pathways stimulate quiescent smooth muscle cells (SMCs) to exit from G 0 and re-enter the cell cycle. Thus, a combination of two drugs with different mechanisms of action may represent a suitable approach to control SMC proliferation, a prominent feature...
Abstract Arrestin binding to agonist-occupied phosphorylated G protein-coupled receptors typically increases the affinity of agonist binding, increases resistance of receptor-bound agonist to removal with high acid/salt buffer, and leads to receptor desensitization and internalization. We tested...
Abstract Carboxyfluoroquinolones, such as ciprofloxacin, are used for the treatment of numerous infectious diseases. Renal secretion is a major determinant of their systemic and urinary concentration, but the specific transporters involved are virtually unknown. In vivo studies implicate the...
Abstract In recent years, several studies have demonstrated that different ligands can have distinct efficacy profiles toward various signaling pathways through a unique receptor. For example, β1-adrenergic compounds that are inverse agonists toward the adenylyl cyclase (AC) can display agonist...
Abstract The precise mechanism by which the cellular uptake of the endocannabinoid anandamide (AEA) occurs has been the source of much debate. In the current study, we show that neuronal differentiated CAD (dCAD) cells accumulate anandamide by a process that is inhibited in a dose-dependent...
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