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Journal Article
Research Support, Non-U.S. Gov't
Review
Insulin/IGF-1 paradox of aging: regulation via AKT/IKK/NF-kappaB signaling.
Cellular Signalling 2010 April
GH/insulin/IGF-1 signaling is a vital pathway e.g. in the regulation of protein synthesis and glucose metabolism. However, mouse dwarf strains which exhibit reduced GH secretion and subsequently a decline in IGF-1 signaling can live longer than their wild type counterparts. There is striking evidence indicating that the IGF-1/PI-3K/AKT signaling enhances growth of animals during development but later in life can potentiate the aging process. This conserved pleiotropy has been called the insulin/IGF-1 paradox. In Caenorhabditiselegans, the decline in this pathway activates the DAF-16 gene, an ortholog of mammalian FoxO genes, which regulate stress resistance and longevity. The mammalian PI-3K/AKT pathway also activates the NF-kappaB signaling that inhibits apoptosis and triggers inflammatory responses. Many longevity genes, e.g. FoxOs and SIRT1, are inhibitors of NF-kappaB signaling. We will discuss the evidence that insulin/IGF-1 signaling can enhance the NF-kappaB signaling and subsequently potentiate the aging process and aggravate age-related degenerative diseases.
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