Antioxidants (Jul 2021)

Characterization of the Striatal Extracellular Matrix in a Mouse Model of Parkinson’s Disease

  • Ana Freitas,
  • Miguel Aroso,
  • António Barros,
  • Miriam Fernández,
  • Eduardo Conde-Sousa,
  • Marina Leite,
  • Eva Daniela Carvalho,
  • Cristina C Ribeiro,
  • Rita Ferreira,
  • Ana Paula Pêgo,
  • Rui Vitorino,
  • Maria Gomez-Lazaro

DOI
https://doi.org/10.3390/antiox10071095
Journal volume & issue
Vol. 10, no. 7
p. 1095

Abstract

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Parkinson’s disease’s etiology is unknown, although evidence suggests the involvement of oxidative modifications of intracellular components in disease pathobiology. Despite the known involvement of the extracellular matrix in physiology and disease, the influence of oxidative stress on the matrix has been neglected. The chemical modifications that might accumulate in matrix components due to their long half-live and the low amount of extracellular antioxidants could also contribute to the disease and explain ineffective cellular therapies. The enriched striatal extracellular matrix from a mouse model of Parkinson’s disease was characterized by Raman spectroscopy. We found a matrix fingerprint of increased oxalate content and oxidative modifications. To uncover the effects of these changes on brain cells, we morphologically characterized the primary microglia used to repopulate this matrix and further quantified the effects on cellular mechanical stress by an intracellular fluorescence resonance energy transfer (FRET)-mechanosensor using the U-2 OS cell line. Our data suggest changes in microglia survival and morphology, and a decrease in cytoskeletal tension in response to the modified matrix from both hemispheres of 6-hydroxydopamine (6-OHDA)-lesioned animals. Collectively, these data suggest that the extracellular matrix is modified, and underscore the need for its thorough investigation, which may reveal new ways to improve therapies or may even reveal new therapies.

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