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Wnt/Beta-Catenin Signaling and Small Molecule Inhibitors Send Orders of Reprints at [email protected] 634 Current Pharmaceutical Design, 2013, 19, 634-664 Wnt/beta-Catenin Signaling and Small Molecule Inhibitors Andrey Voronkov* and Stefan Krauss* SFI-CAST Biomedical Innovation Center, Unit for Cell Signaling, Oslo University Hospital, Forskningsparken, Gaustadalleén 21, 0349, Oslo, Norway Abstract: Wnt/-catenin signaling is a branch of a functional network that dates back to the first metazoans and it is involved in a broad range of biological systems including stem cells, embryonic development and adult organs. Deregulation of components involved in Wnt/-catenin signaling has been implicated in a wide spectrum of diseases including a number of cancers and degenerative diseases. The key mediator of Wnt signaling, -catenin, serves several cellular functions. It functions in a dynamic mode at multiple cellular loca- tions, including the plasma membrane, where -catenin contributes to the stabilization of intercellular adhesive complexes, the cytoplasm where -catenin levels are regulated and the nucleus where -catenin is involved in transcriptional regulation and chromatin interactions. Central effectors of -catenin levels are a family of cysteine-rich secreted glycoproteins, known as Wnt morphogens. Through the LRP5/6-Frizzled receptor complex, Wnts regulate the location and activity of the destruction complex and consequently intracellular - catenin levels. However, -catenin levels and their effects on transcriptional programs are also influenced by multiple other factors in- cluding hypoxia, inflammation, hepatocyte growth factor-mediated signaling, and the cell adhesion molecule E-cadherin. The broad im- plications of Wnt/-catenin signaling in development, in the adult body and in disease render the pathway a prime target for pharmacol- ogical research and development. The intricate regulation of -catenin at its various locations provides alternative points for therapeutic interventions. Keywords: -catenin, cancer, drug discovery, small molecule inhibitors, stem cells, Wnt. INTRODUCTION -catenin itself is a specialized member of the larger armadillo Wnt/-catenin signaling is a branch of an extensive functional protein family that consists of three subfamilies: the p120 subfam- network that developed around a class of proteins - called armadillo ily, the beta subfamily (-catenin and plakoglobin) and the more proteins - that dates back to the first anaerobic metazoans. Wnt/- distant alpha subfamily. The functional interplay between members catenin signaling is involved in a broad range of biological systems, of this protein family is not well understood, but an involvement of including stem cells biology, developmental biology, and adult p120 and plakoglobin in Wnt/-catenin signaling has been shown. organ systems. The regulation of the presence and stability of -catenin and The first detail of the Wnt/-catenin network was reported in functionally convergent armadillo proteins – in particular p120 - at 1982 with the identification of the proto-oncogene int-1 in mice [1]. the various cellular localizations as well as their shuffling within Later its homolog in Drosophila, Wingless, was shown to be re- the cell provides alternative intervention points for therapeutic rea- quired for proper wing formation [2]. In 1989 injection of Wnt1 gents. The broad implications of Wnt/-catenin signaling in devel- mRNA in Xenopus was shown to cause body axis duplication, and opment, the adult body and in disease renders it a prime target for demonstrated the functional conservation of the pathway [3]. Since pharmacological research and development. A short overview map then, the functional importance of Wnt/-catenin signaling has been for canonical Wnt signaling is presented on Fig. (1). shown in a plethora of developmental and organ systems including The armadillo protein -catenin is the central denominator of the cerebral cortex, the hippocampus, the eye, the lens, the spinal Wnt/-catenin (canonical Wnt) signaling. The levels of -catenin at cord, limbs, bone, cartilage, somites, the neural crest, skin, teeth, different subcellular localizations are regulated by a variety of the gut, the lungs, the heart, the pancreas, the liver, the kidneys, the processes including site-specific phosphorylation of -catenin. In mammary glands, the hematopoetic system and the reproductive particular, the control of the turnover of cytoplasmic -catenin by system [4-7]. Deregulation of Wnt/-catenin signaling is implicated the destruction complex and the control of the destruction complex in a wide spectrum of diseases including degenerative diseases, by the Wnt signalosome have been studied extensively. Other im- metabolic diseases and cancer [4], [8-11]. portant mechanisms regulating subcellular -catenin thresholds are The key mediator of Wnt signaling, the armadillo protein - those controlling its mobilization from adherens junctions and its catenin, is found in a dynamic mode at multiple subcellular locali- translocation to the nucleus. One of the central end points of the zations, including junctions where it contributes to stabilize cell-cell Wnt/-catenin signaling pathway is the regulation of transcription contacts, the cytoplasm where -catenin levels are tightly controlled through the binding of -catenin to members of the Tcf-1/lymphoid by protein stability regulating processes and the nucleus, where - enhancer factors (Lef-1, 3, 4) family of transcription factors in the catenin is involved in transcriptional regulation and chromatin in- nucleus [12-14]. teractions. Central extracellular regulators of -catenin levels are The structure of -catenin can be divided into three domains: the Wnt morphogens. However, multiple other processes, including the N-terminal domain, the armadillo domain consisting of 12 ar- hepatocyte growth factor, prostaglandines, PKA (Protein Kinase madillo repeats, and the C-terminal domain [15]. Through pre- A), E-cadherin, and hypoxia, can also influence -catenin levels. dominantly positively charged armadillo (Arm) repeats, -catenin is a member of an expanded and evolutionary ancient protein family that includes plakoglobin (-catenin), APC (adenomatosis polyposis *Address correspondence to these authors at the SFI-CAST Biomedical coli), p120 and other proteins [16-18]. Local charge alterations of Innovation Center, Unit for Cell Signaling, Oslo University Hospital, -catenin through phosphorylation at a multitude of positions have Forskningsparken, Gaustadalleén 21, 0349, Oslo, Norway; been suggested to regulate its affinity to specific protein partners. Tel:/Fax: +47 22958155/ +47 22958151; E-mail: [email protected], [email protected] This includes C-terminal phosphorylation that attenuates the bind- 1873-4286/13 $58.00+.00 © 2013 Bentham Science Publishers Wnt/beta-catenin Signaling and Small Molecule Inhibitors Current Pharmaceutical Design, 2013, Vol. 19, No. 4 635 Fig. (1). Simplified schematic representation of drug targets (yellow stars) in Wnt/-catenin-mediated signaling. Four key aspects that regulate -catenin- mediated signaling are highlighted: the destruction complex, the Wnt/-catenin signalosome, cadherin junctions, and the hypoxia sensing system Hif-1 (hipoxia induced factor 1). Proteins that directly interact with Wnt/-catenin are marked as colored structures, other proteins are marked as circles. ing of -catenin to the cadherin adhesion complex and N-terminal in transcription control. Finally, we will summarize some of the phosphorylation that regulates its degradation in the proteasome. pathways that influence Wnt/-catenin signaling. Several proteins Furthermore, phosphorylation regulates the association of -catenin in the Wnt/-catenin pathway that are implicated in other cellular with Tcf/Lef during transcriptional regulation [19]. processes will be briefly described. In this review we will first describe the alterations of -catenin The -Catenin Destruction Complex and its Proteins in the destruction complex and the proteins that are involved in this process. We will then focus on the Wnt signalosome that recruits In the absence of an active Wnt signalosome, cytoplasmic - components of the destruction complex thus inactivating it. Subse- catenin associates with the destruction complex. The main known quently, we will summarize how the signalosome is removed from structural components of the destruction complex are APC and the cell surface by endocytosis. Next we will describe the cellular Axin. To this structural core, the casein kinases CK1, , and (to pool of -catenin at cell junctions and the mobilization of -catenin be referred to collectively as CK1) and GSK3 (glycogen synthase from this pool. Then we will focus on the implications of -catenin kinase 3) are recruited [20]. 636 Current Pharmaceutical Design, 2013, Vol. 19, No. 4 Voronkov and Krauss In the degradation complex the processing of -catenin is consid- Axam, 353–437 for GSK3, 530–712/757–820 for Dishevelled, 217- ered as a phosphorylation-dependent flux along the Axin scaffold 352/508-712 for CK1 and 353-437 for Diversin [35]. Recently it protein which is regulated by a stepwise series of phosphorylations was also shown by X-ray analysis that the N-terminal domain of triggered by the kinases CK1 and GSK3 [15, 20]. A current model Axin (1-80 aa) is responsible for binding to Tankyrase [57]. Interac- proposes that -catenin initially binds to Axin. The priming kinases tions with Axin promote dimerizatoin of Tankyrase. Additional CK1 phosphorylate -catenin at Ser45 [20], which enables
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