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The Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Multiple sclerosis synaptic connectome: Insights from fluid biomarkers.

Lorenzo Gaetani1, Laura Bellingacci2, Silvia Sperandei1

  • 1Section of Neurology, Department of Medicine and Surgery, University of Perugia, Perugia, Italy.

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Synaptic dysfunction contributes to brain network changes in multiple sclerosis. Synaptic proteins in cerebrospinal fluid and blood show promise as biomarkers for tracking disease progression and disability.

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Area of Science:

  • Neuroscience
  • Biomarkers
  • Multiple Sclerosis Research

Background:

  • Multiple sclerosis (MS) is a chronic central nervous system disease characterized by immune-mediated damage and neurodegeneration.
  • Brain network disconnection, resulting from demyelination, axonal loss, and atrophy, is increasingly linked to MS progression and disability.
  • Synaptic dysfunction is implicated in MS-related connectome changes, yet objective measures are lacking.

Purpose of the Study:

  • To review the role of synaptic dysfunction and loss in MS.
  • To explore synaptic proteins as potential fluid biomarkers for synaptic integrity in MS.
  • To discuss current findings, challenges, and future directions for synaptic biomarker research in MS.

Main Methods:

  • Literature review focusing on synaptic dysfunction in MS.
  • Analysis of studies investigating synaptic proteins (presynaptic, postsynaptic, astrocyte-derived) as fluid biomarkers.
  • Discussion of methodological challenges and future research needs.

Main Results:

  • Synaptic proteins, including SNAP-25, VAMP-2, β-synuclein, neurogranin, and NPTX2, are measurable in cerebrospinal fluid and blood.
  • These proteins reflect synaptic dysfunction and loss in MS, analogous to findings in other neurodegenerative diseases.
  • Preliminary data suggest potential for these markers in assessing synaptic integrity.

Conclusions:

  • Synaptic proteins represent a promising avenue for fluid biomarker development in MS.
  • Further research is needed to validate these markers and understand their temporal dynamics and relationship with neuroinflammation and neurodegeneration.
  • Objective measures of synaptic integrity could significantly advance MS diagnosis and management.