Gião, TiagoSaavedra, JoanaCotrina, EllenQuintana, JordiLlop, JordiArsequell, GemmaCardoso, Isabel2020-06-082020-06-082020Gião T, Saavedra J, Cotrina E, Quintana J, Llop J, Arsequell G, et al. Undiscovered roles for transthyretin: from a transporter protein to a new therapeutic target for Alzheimer's disease. Int J Mol Sci. 2020 Mar 18; 21(6):2075. DOI: 10.3390/ijms210620751422-0067http://hdl.handle.net/10230/44916Transthyretin (TTR), an homotetrameric protein mainly synthesized by the liver and the choroid plexus, and secreted into the blood and the cerebrospinal fluid, respectively, has been specially acknowledged for its functions as a transporter protein of thyroxine and retinol (the latter through binding to the retinol-binding protein), in these fluids. Still, this protein has managed to stay in the spotlight as it has been assigned new and varied functions. In this review, we cover knowledge on novel TTR functions and the cellular pathways involved, spanning from neuroprotection to vascular events, while emphasizing its involvement in Alzheimer's disease (AD). We describe details of TTR as an amyloid binding protein and discuss its interaction with the amyloid Aβ peptides, and the proposed mechanisms underlying TTR neuroprotection in AD. We also present the importance of translating advances in the knowledge of the TTR neuroprotective role into drug discovery strategies focused on TTR as a new target in AD therapeutics.application/pdfengCopyright © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).info:eu-repo/semantics/articlehttp://dx.doi.org/10.3390/ijms21062075Alzheimer’s diseaseTTR tetrameric stabilityAmyloid diseasesAngiogenesisBlood–brain barrier;Cerebrospinal fluid proteinNeuroprotectionTransport proteinTransthyretininfo:eu-repo/semantics/openAccess