Abstract
IGF-I action in the brain is not limited to its growth-promoting effects during fetal and neonatal development. Significant effects of IGF-I in the adult brain have been demonstrated in various contexts. The potent neuroprotective action of IGF was discovered in vitro and has been confirmed in vivo. The proposed mechanisms of IGF-I neuroprotection depend on age, and very interesting implications of IGF signaling in neurodegeneration, notably in amyotrophic lateral sclerosis and Alzheimer's disease, have been observed. The rescue of neurons following IGF-I administration has been extensively studied in rodent models in which a cerebrovascular accident is caused by experimental ischemia/hypoxia. Discrepancies have arisen in the effects of IGF-I observed in vivo, possibly reflecting the different actions of exogenous and endogenous IGF-I. Further studies are needed to elucidate the intracellular mechanisms of neuronal death following hypoxia/ischemia and the role of IGF-I in this process. Growing evidence demonstrates the selective action of IGF-I on glial cells. However, few experimental models can address the specific roles of astrocytes and microglia in the neuronal rescue mediated by IGF signaling. Endothelial cells also respond to IGF-I, possibly mediating neuroprotective effects of IGF-I through the control of edema following CNS damage. Recent studies on longevity and aging suggest that decreased insulin/insulin-like signaling increases life span and survival. Similarly, caloric restriction reduces IGF-I levels in the circulation and in the brain, at the same time increasing the longevity of the organism. Paradoxically, excess IGF-I promotes neuronal survival in the brain and reduces the longevity of the organism.
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De Magalhaes Filho, C., Holzenberger, M. (2010). IGF Receptors in the Adult Brain. In: Clemmons, D., Robinson, I., Christen, Y. (eds) IGFs:Local Repair and Survival Factors Throughout Life Span. Research and Perspectives in Endocrine Interactions. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04302-4_10
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