YKL-40 (Chitinase 3-like I) is expressed in a subset of astrocytes in Alzheimer's disease and other tauopathies
Por:
Querol-Vilaseca M., Colom-Cadena M., Pegueroles J., San Martín-Paniello C., Clarimon J., Belbin O., Fortea J., Lleó A.
Publicada:
1 ene 2017
Resumen:
Background: The innate immune system is known to be involved early in the pathogenesis of Alzheimer's disease (AD) and other neurodegenerative disorders. The inflammatory response in the central nervous system can be measured postmortem or through a series of inflammatory mediator surrogates. YKL-40 (also named Chitinase-3-like I) has been frequently investigated in body fluids as a surrogate marker of neuroinflammation in AD and other neurological disorders. However, the expression pattern of YKL-40 in the human brain with neurodegenerative pathology remains poorly investigated. Our aim was to study the cellular expression pattern of YKL-40 in the brain of patients with clinical and neuropathological criteria for AD (n = 11); three non-AD tauopathies: Pick's disease (PiD; n = 8), corticobasal degeneration (CBD; n = 8) and progressive supranuclear palsy (PSP; n = 9) and a group of neurologically healthy controls (n = 6). Methods: Semiquantitative neuropathological evaluation and quantitative confocal triple immunofluorescence studies were performed. An in-house algorithm was used to detect and quantify pathology burden of random regions of interest on a full tissue-section scan. Kruskal-Wallis and Dunn's multiple comparison tests were performed for colocalization and quantification analyses. Results: We found that brain YKL-40 immunoreactivity was observed in a subset of astrocytes in all four diseases and in controls. There was a strong colocalization between YKL-40 and the astroglial marker GFAP but not with neuronal nor microglial markers. Intriguingly, YKL-40-positive astrocytes were tau-negative in PSP, CBD and PiD. The number of YKL-40-positive astrocytes was increased in tauopathies compared with that in controls. A positive correlation was found between YKL-40 and tau immunoreactivities. Conclusions: This study confirms that YKL-40 is expressed by a subset of astrocytes in AD and other tauopathies. YKL-40 expression is elevated in several neurodegenerative conditions and correlates with tau pathology. © 2017 The Author(s).
Filiaciones:
Querol-Vilaseca M.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
Colom-Cadena M.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
Pegueroles J.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
San Martín-Paniello C.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Clarimon J.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
Belbin O.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
Fortea J.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
Lleó A.:
Universitat Autònoma de Barcelona, Memory Unit, Department of Neurology, Institut d'Investigacions Biomèdiques Sant Pau - Hospital de la Santa Creu i Sant Pau, Sant Antoni M. Claret 167, Barcelona, 08025, Spain
Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
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