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Blood factors cause brain issues in Down syndrome (DS). Elevated beta-2 microglobulin (B2M) in DS plasma impairs synaptic function by blocking NMDA receptors (NMDARs), suggesting B2M as a therapeutic target.

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Area of Science:

  • Neuroimmunology
  • Synaptic Plasticity
  • Molecular Neuroscience

Background:

  • Down syndrome (DS) involves neurological and immune symptoms, with unexplored CNS-peripheral immune system interactions.
  • Synaptic deficits are a hallmark of DS, impacting cognitive function.

Purpose of the Study:

  • To investigate the role of blood-borne factors in DS-associated synaptic deficits.
  • To identify specific molecules mediating CNS-immune crosstalk in DS.

Main Methods:

  • Parabiosis and plasma infusion experiments in mouse models.
  • Proteomic analysis of human DS plasma.
  • Systemic administration of beta-2 microglobulin (B2M) and anti-B2M antibodies.
  • Investigating B2M-NMDA receptor (NMDAR) interactions.

Main Results:

  • Blood-borne factors were identified as drivers of synaptic deficits in DS.
  • Elevated B2M levels in DS plasma correlated with synaptic and memory impairments.
  • Genetic or antibody-mediated B2M reduction ameliorated synaptic deficits in DS mice.
  • B2M was shown to antagonize NMDAR function by interacting with the GluN1-S2 loop.

Conclusions:

  • Circulating B2M is an endogenous NMDAR antagonist.
  • B2M plays a pathophysiological role in NMDAR dysfunction in Down syndrome.
  • Targeting B2M-NMDAR interactions offers a potential therapeutic strategy for cognitive disorders in DS.