Abstract
The insulin-like growth factor (IGF) axis mediates growth, differentiation and developmental processes, and is also involved in control of metabolic activities. Deregulation of IGF axis expression and action is linked to a number of pathologies, ranging from metabolic disorders to growth deficits and cancer development. Activation of the IGF signaling pathway is a crucial prerequisite for malignant transformation. In addition, overexpression of the IGF-1 receptor (IGF-1R) constitutes a typical hallmark of most types of cancer. A series of tumor suppressors have been identified whose mechanisms of action involve transcriptional suppression of the IGF-1R gene. These tumor suppressors include the p53/p63/p73 family, breast cancer gene-1, von-Hippel Lindau protein, Wilms’ tumor-1 and others. Comprehensive analyses have identified a complex bidirectional interplay between the IGF and tumor-suppressor signaling pathways. These interactions are of major importance in terms of cancer development and may also predict responsiveness to IGF-1R-targeted therapies. Furthermore, the insulin/IGF system has a pivotal role in the regulation of cancer cell metabolism. Deregulation of IGF axis components by mutated tumor-suppressor proteins may lead to metabolic perturbations, with ensuing pathological consequences.
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Acknowledgements
Work in the laboratory of HW is supported by grants from the Israel Science Foundation, Israel Cancer Association, Insulin-Dependent Diabetes Trust (IDDT, UK), Israel Cancer Research Fund (ICRF, New York and Montreal) and US-Israel Binational Science Foundation.
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Werner, H. Tumor suppressors govern insulin-like growth factor signaling pathways: implications in metabolism and cancer. Oncogene 31, 2703–2714 (2012). https://doi.org/10.1038/onc.2011.447
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