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Astrocyte-microglial association and matrix composition are common events in the natural history of primary familial brain calcification.

Authors
  • Nahar, Khayrun1
  • Lebouvier, Thibaud1, 2, 3
  • Andaloussi Mäe, Maarja1
  • Konzer, Anne4
  • Bergquist, Jonas5
  • Zarb, Yvette6, 7
  • Johansson, Bengt8
  • Betsholtz, Christer1, 9
  • Vanlandewijck, Michael1, 9
  • 1 Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden. , (Sweden)
  • 2 Department of Neurology, CHRU Lille, Lille, France. , (France)
  • 3 Inserm U1171, Lille, France. , (France)
  • 4 Scientific Service Group Mass Spectrometry, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany. , (Germany)
  • 5 Department of Chemistry, Biomedical Centre, Uppsala University, Uppsala, Sweden. , (Sweden)
  • 6 Department of Neurosurgery, Clinical Neuroscience Center, Zurich University Hospital, Zurich University, Zurich, Switzerland. , (Switzerland)
  • 7 Neuroscience Center Zurich (ZNZ), University of Zurich and ETH Zurich, Zurich, Switzerland. , (Switzerland)
  • 8 Electron Microscopy Unit, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden. , (Sweden)
  • 9 Integrated Cardio Metabolic Centre (ICMC), Karolinska Institute, Huddinge, Sweden. , (Sweden)
Type
Published Article
Journal
Brain Pathology
Publisher
Wiley (Blackwell Publishing)
Publication Date
May 01, 2020
Volume
30
Issue
3
Pages
446–464
Identifiers
DOI: 10.1111/bpa.12787
PMID: 31561281
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Primary familial brain calcification (PFBC) is an age-dependent and rare neurodegenerative disorder characterized by microvascular calcium phosphate deposits in the deep brain regions. Known genetic causes of PFBC include loss-of-function mutations in genes involved in either of three processes-platelet-derived growth factor (PDGF) signaling, phosphate homeostasis or protein glycosylation-with unclear molecular links. To provide insight into the pathogenesis of PFBC, we analyzed murine models of PFBC for the first two of these processes in Pdgfbret/ret and Slc20a2-/- mice with regard to the structure, molecular composition, development and distribution of perivascular calcified nodules. Analyses by transmission electron microscopy and immunofluorescence revealed that calcified nodules in both of these models have a multilayered ultrastructure and occur in direct contact with reactive astrocytes and microglia. However, whereas nodules in Pdgfbret/ret mice were large, solitary and smooth surfaced, the nodules in Slc20a2-/- mice were multi-lobulated and occurred in clusters. The regional distribution of nodules also differed between the two models. Proteomic analysis and immunofluorescence stainings revealed a common molecular composition of the nodules in the two models, involving proteins implicated in bone homeostasis, but also proteins not previously linked to tissue mineralization. While the brain vasculature of Pdgfbret/ret mice has been reported to display reduced pericyte coverage and abnormal permeability, we found that Slc20a2-/- mice have a normal pericyte coverage and no overtly increased permeability. Thus, lack of pericytes and increase in permeability of the blood-brain barrier are likely not the causal triggers for PFBC pathogenesis. Instead, gene expression and spatial correlations suggest that astrocytes are intimately linked to the calcification process in PFBC. © 2019 The Authors. Brain Pathology published by John Wiley & Sons Ltd on behalf of International Society of Neuropathology.

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