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- Title
Role of insulin-like growth factor I signaling in neurodegenerative diseases.
- Authors
Trejo, José Luis; Carro, Eva; Garcia-Galloway, Eva; Torres-Aleman, Ignacio
- Abstract
Disturbed trophic support to neurons has long been considered a potential mechanism in neurodegeneration. Recent evidence indicates that intracellular trophic signaling may be compromised in several neurodegenerative diseases. Changes in the levels of insulin-like growth factor I (IGF-I), a trophic hormone with multiple neuroprotective actions, have recently been observed in several human neurodegenerative illnesses. Therefore analysis of IGF-I pathways could help provide greater insight into trophic disturbances to neurons. However, neurodegenerative diseases with similar clinical manifestations show either high or low levels of circulating IGF-I. This apparently puzzling observation can be explained if we consider that IGF-I input to target neurons is disrupted by either lower IGF-I availability or by reduced cell sensitivity to IGF-I. The latter disturbance may be associated with high IGF-I levels. We hypothesize that in the majority of neurodegenerative diseases compromised IGF-I support to neurons emerges as part of the pathological cascade during the degenerative process and contributes to neuronal demise. In addition, loss of IGF-I input to specific neuronal populations might be the cause of a small group of neurodegenerative diseases.
- Publication
Journal of molecular medicine (Berlin, Germany), 2004, Vol 82, Issue 3, p156
- ISSN
0946-2716
- Publication type
Journal Article
- DOI
10.1007/s00109-003-0499-7