Inflammation in ALS/FTD Pathogenesis
TLDR
Evidence for direct influence on immune cell function by mutations in ALS/FTD genes including C9orf72, TBK1 and OPTN is discussed, and how this could lead to the altered innate immune system “tone” observed in these patients.Abstract:
Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are neurodegenerative diseases that overlap in their clinical presentation, pathology and genetics, and likely represent a spectrum of one underlying disease. In ALS/FTD patients, neuroinflammation characterized by innate immune responses of tissue-resident glial cells is uniformly present on end-stage pathology, and human imaging studies and rodent models support that neuroinflammation begins early in disease pathogenesis. Additionally, changes in circulating immune cell populations and cytokines are found in ALS/FTD patients, and there is evidence for an autoinflammatory state. However, despite the prominent role of neuro- and systemic inflammation in ALS/FTD, and experimental evidence in rodents that altering microglial function can mitigate pathology, therapeutic approaches to decrease inflammation have thus far failed to alter disease course in humans. Here, we review the characteristics of inflammation in ALS/FTD in both the nervous and peripheral immune systems. We further discuss evidence for direct influence on immune cell function by mutations in ALS/FTD genes including C9orf72, TBK1 and OPTN, and how this could lead to the altered innate immune system “tone” observed in these patients.read more
Citations
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Expanded GGGGCC hexanucleotide repeat in noncoding region of C9ORF72 causes chromosome 9p-linked FTD and ALS
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A hexanucleotide repeat expansion in C9ORF72 is the cause of chromosome 9p21-linked ALS-FTD
Alan E. Renton,Elisa Majounie,Adrian James Waite,Javier Simón-Sánchez,Javier Simón-Sánchez,Sara Rollinson,J. Raphael Gibbs,J. Raphael Gibbs,Jennifer C. Schymick,Hannu Laaksovirta,John C. van Swieten,John C. van Swieten,Liisa Myllykangas,Hannu Kalimo,Anders Paetau,Yevgeniya Abramzon,Anne M. Remes,Alice Kaganovich,Sonja W. Scholz,Sonja W. Scholz,Sonja W. Scholz,Jamie Duckworth,Jinhui Ding,Daniel W. Harmer,Dena G. Hernandez,Dena G. Hernandez,Janel O. Johnson,Janel O. Johnson,Kin Y. Mok,Mina Ryten,Danyah Trabzuni,Rita Guerreiro,Richard W. Orrell,James Neal,Alexandra Murray,J. P. Pearson,Iris E. Jansen,David Sondervan,Harro Seelaar,Derek J. Blake,Kate Young,Nicola Halliwell,Janis Bennion Callister,Greg Toulson,Anna Richardson,Alexander Gerhard,Julie S. Snowden,David M. A. Mann,David Neary,Mike A. Nalls,Terhi Peuralinna,Lilja Jansson,Veli-Matti Isoviita,Anna-Lotta Kaivorinne,Maarit Hölttä-Vuori,Elina Ikonen,Raimo Sulkava,Michael Benatar,Joanne Wuu,Adriano Chiò,Gabriella Restagno,Giuseppe Borghero,Mario Sabatelli,David Heckerman,Ekaterina Rogaeva,Lorne Zinman,Jeffrey D. Rothstein,Michael Sendtner,Carsten Drepper,Evan E. Eichler,Can Alkan,Ziedulla Abdullaev,Svetlana Pack,Amalia Dutra,Evgenia Pak,John Hardy,Andrew B. Singleton,Nigel Williams,Peter Heutink,Stuart Pickering-Brown,Huw R. Morris,Huw R. Morris,Huw R. Morris,Pentti J. Tienari,Bryan J. Traynor,Bryan J. Traynor +85 more
TL;DR: The chromosome 9p21 amyotrophic lateral sclerosis-frontotemporal dementia (ALS-FTD) locus contains one of the last major unidentified autosomal-dominant genes underlying these common neurodegenerative diseases, and a large hexanucleotide repeat expansion in the first intron of C9ORF72 is shown.
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