Serum insulin-like growth factor I regulates brain amyloid-beta levels.

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 Med

journal_title

Nature medicine

authors

Carro E,Trejo JL,Gomez-Isla T,LeRoith D,Torres-Aleman I

doi

10.1038/nm1202-793

keywords:

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

1390-7

issue

12

eissn

1078-8956

issn

1546-170X

pii

nm793

journal_volume

8

pub_type

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