Abstract
Textbooks depict box-to-box signaling schematics downstream of G-protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs), yet it is now widely accepted that cellular signaling is much more web-like than linear, and the nodes of crosstalk between pathways and receptors increase in complexity and intricacy with each additional study. A complex network involving bidirectional crosstalk between GPCRs and RTKs is emerging, and this phenomenon is commonly termed “transactivation.” In this process, RTKs or components of RTK pathways are utilized by GPCRs or, conversely, components of classical GPCRs such as G proteins, GRKs, and β-arrestins are recruited downstream of activated RTKs. This chapter aims to summarize the emerging evidence of RTKs utilizing GPCR components, thus blurring the boundaries we have given them. In particular, we will follow how all of the functional components of the GPCR system have been described for the insulin receptor (IR) and the insulin-like growth factor type 1 receptor (IGF-1R) and hence the rationale behind the development of a functional RTK/GPCR hybrid model. Given the IGF-1R’s important role in the development and maintenance of a malignant phenotype, GPCR components, such as the GRK/β-arrestin system, may yield important future targets in anti-IGF-1R therapeutics.
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Acknowledgements
Research support for Leonard Girnita’s group: Swedish Research Council, Swedish Cancer Society, Children Cancer Society, Crown Princess Margareta’s Foundation for the Visually Impaired, Welander Finsen Foundation, King Gustaf V Jubilee Foundation, Stockholm Cancer Society, the Stockholm County, and Karolinska Institutet.
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Girnita, L., Girnita, A., Crudden, C. (2016). Differential Regulation of IGF-1 and Insulin Signaling by GRKs. In: Gurevich, V., Gurevich, E., Tesmer, J. (eds) G Protein-Coupled Receptor Kinases. Methods in Pharmacology and Toxicology. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-3798-1_7
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