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REVIEW
Department of Emergency and Organ Transplantation, Section on Internal Medicine, Endocrinology, and Metabolic Diseases, University of Bari, Bari, Italy
Submitted 20 May 2008 ; accepted in final form 15 August 2008
ABSTRACT
IGF-I action is essential for the regulation of tissue formation and remodeling, bone growth, prenatal growth, brain development, and muscle metabolism. Cellular effects of IGF-I are mediated through the IGF-I receptor, a transmembrane tyrosine kinase that phosphorylates intracellular substrates, resulting in the activation of multiple intracellular signaling cascades. Dysregulation of IGF-I actions due to impairment in the postreceptor signaling machinery may contribute to multiple diseases in humans. This article will review current information on IGF-I signaling and illustrate recent results demonstrating how impaired IGF-I signaling and action may contribute to the pathogenesis of human diseases, including osteoporosis, neurodegenerative disorders, and reduced fetal growth in utero.
insulin-like growth factor I; insulin-like growth factor I receptor; osteoblasts; osteoporosis; neurodegenerative disorders; placenta; intrauterine growth restriction
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