Defective brain hormonal signaling has been associated with Alzheimer’s disease (AD), a disorder characterized by synapse and memory failure. Irisin is an exercise-induced myokine released on cleavage of the membrane-bound precursor protein fibronectin type III domain-containing protein 5 (FNDC5), also expressed in the hippocampus. Here we show that FNDC5/irisin levels are reduced in AD hippocampi and cerebrospinal fluid, and in experimental AD models. Knockdown of brain FNDC5/irisin impairs long-term potentiation and novel object recognition memory in mice. Conversely, boosting brain levels of FNDC5/irisin rescues synaptic plasticity and memory in AD mouse models. Peripheral overexpression of FNDC5/irisin rescues memory impairment, whereas blockade of either peripheral or brain FNDC5/irisin attenuates the neuroprotective actions of physical exercise on synaptic plasticity and memory in AD mice. By showing that FNDC5/irisin is an important mediator of the beneficial effects of exercise in AD models, our findings place FNDC5/irisin as a novel agent capable of opposing synapse failure and memory impairment in AD.
|Number of pages||11|
|State||Published - Jan 1 2019|
Bibliographical noteFunding Information:
This work was supported by grants from Alzheimer Society of Canada (to F.G.D.F.) and the Weston Brain Institute (to F.G.D.F.), National Institute for Translational Neuroscience (INNT/Brazil) (465346/2014-6 to S.T.F. and F.G.F.), Human Frontier Science Program (to F.G.D.F.), International Society for Neurochemistry (CAEN 1B to M.V.L.), National Institutes of Health (NIH-R01NS049442 to O.A.), Canadian Institutes of Health Research (CIHR MOP 136940 and MOP 89919 to V.F.P. and M.A.M.P.), and from the Brazilian funding agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (451195/2017-5 to M.V.L., 406436/2016-9 to S.T.F., and 473324/2013-0 to F.G.D.F.) and Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) (202.817/2016 to M.V.L., 201.432/2014 to S.T.F., and 202.944/2015 to F.G.D.F.). R.L.F, G.B.d.F., G.C.K., F.C.R., J.R.C., D.B., and L.F.-G. were supported by fellowships granted by FAPERJ, CNPq, or Comissão de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/Brazil; financial code 001). S.M. was supported by an NIH T32 grant (AG057461). We acknowledge the University of Kentucky Alzheimer’s Disease Center and its Neuropathology Core, which is supported by NIH/NIA P30 AG028383, for brain samples. We thank W.L. Klein (Northwestern University) for the kind gift of oligomer-specific NU4 antibodies, B.M. Spiegelman (Harvard University) for sharing AdGFP and AdFNDC5 adenoviral constructs, and J. Wang (Queen’s University, Canada) for help with mass spectrometry analyses. We also thank A. Lepelley, M. Oliveira, M. Melo, A.C. Rangel, and the CENABIO team for technical and/or administrative assistance.
© 2019, The Author(s), under exclusive licence to Springer Nature America, Inc.
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology (all)