Abstract:
:Levels of insulin-like growth factor I (IGF-I), a neuroprotective hormone, decrease in serum during aging, whereas amyloid-beta (Abeta), which is involved in the pathogenesis of Alzheimer disease, accumulates in the brain. High brain Abeta levels are found at an early age in mutant mice with low circulating IGF-I, and Abeta burden can be reduced in aging rats by increasing serum IGF-I. This opposing relationship between serum IGF-I and brain Abeta levels reflects the ability of IGF-I to induce clearance of brain Abeta, probably by enhancing transport of Abeta carrier proteins such as albumin and transthyretin into the brain. This effect is antagonized by tumor necrosis factor-alpha, a pro-inflammatory cytokine putatively involved in dementia and aging. Because IGF-I treatment of mice overexpressing mutant amyloid markedly reduces their brain Abeta burden, we consider that circulating IGF-I is a physiological regulator of brain amyloid levels with therapeutic potential.
journal_name
Nat Medjournal_title
Nature medicineauthors
Carro E,Trejo JL,Gomez-Isla T,LeRoith D,Torres-Aleman Idoi
10.1038/nm1202-793keywords:
subject
Has Abstractpub_date
2002-12-01 00:00:00pages
1390-7issue
12eissn
1078-8956issn
1546-170Xpii
nm793journal_volume
8pub_type
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