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Glycogen synthase kinase-3β positively regulates protein synthesis and cell proliferation through the regulation of translation initiation factor 4E-binding protein 1
S. Shin; L. Wolgamott; J. Tcherkezian; S. Vallabhapurapu; Y. Yu; P.P. Roux; S.-O. Yoon(Profiled Author: Yonghao Yu)
Protein synthesis has a key role in the control of cell proliferation, and its deregulation is associated with pathological conditions, notably cancer. Rapamycin, an inhibitor of mammalian target of rapamycin complex 1 (mTORC1), was known to inhibit protein synthesis. However, it does not substantially inhibit protein synthesis and cell proliferation in many cancer types. We were interested in finding a novel target in rapamycin-resistant cancer. The rate-limiting factor for translation is eukaryotic translation initiation factor 4E (eIF4E), which is negatively regulated by eIF4E-binding protein 1 (4E-BP1). Here, we provide evidence that glycogen synthase kinase (GSK)-3β promotes cell proliferation through positive regulation of protein synthesis. We found that GSK-3β phosphorylates and inactivates 4E-BP1, thereby increasing eIF4E-dependent protein synthesis. Considering the clinical relevance of pathways regulating protein synthesis, our study provides a promising new strategy and target for cancer therapy. © 2014 Macmillan Publishers Limited.
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