An aging pathway controls the TrkA to p75NTR receptor switch and amyloid beta-peptide generation.

The EMBO Journal
Claudio CostantiniL Puglielli

Abstract

Aging of the brain is characterized by marked changes in the expression levels of the neurotrophin receptors, TrkA and p75(NTR). An expression pattern in which TrkA predominates in younger animals switches to one in which p75(NTR) predominates in older animals. This TrkA-to-p75(NTR) switch is accompanied by activation of the second messenger ceramide, stabilization of beta-site amyloid precursor protein-cleaving enzyme-1 (BACE1), and increased production of amyloid beta-peptide (Abeta). Here, we show that the insulin-like growth factor-1 receptor (IGF1-R), the common regulator of lifespan and age-related events in many different organisms, is responsible for the TrkA-to-p75(NTR) switch in both human neuroblastoma cell lines and primary neurons from mouse brain. The signaling pathway that controls the level of TrkA and p75(NTR) downstream of the IGF1-R requires IRS2, PIP3/Akt, and is under the control of PTEN and p44, the short isoform of p53. We also show that hyperactivation of IGF1-R signaling in p44 transgenic animals, which show an accelerated form of aging, is characterized by early TrkA-to-p75(NTR) switch and increased production of Abeta in the brain.

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Citations

Oct 29, 2009·Journal of Molecular Neuroscience : MN·Claudio CostantiniVittorina Della-Bianca
Jun 25, 2009·Proceedings of the National Academy of Sciences of the United States of America·C MatroneP Calissano
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Aug 23, 2019·Brain Sciences·Marina SychevaJeganathan Ramesh Babu

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