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Drug Development.

Mark Stephen Williams1, Sofia Diego-Diaz2, Geoffrey Canet3

  • 1Marvel Biosciences, Calgary, AB, Canada.

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|December 26, 2025
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Summary
This summary is machine-generated.

MB204, a novel adenosine A2A receptor antagonist, effectively reduced Tau hyperphosphorylation in mice, a key factor in Alzheimer's disease (AD). This suggests MB204's potential as a therapeutic for AD and other tauopathies.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Tau phosphorylation is central to tauopathies like Alzheimer's disease (AD).
  • Adenosine A2A receptor inhibition shows promise in preclinical models of AD.
  • MB204 is a novel A2A receptor antagonist developed for AD and depression.

Purpose of the Study:

  • To investigate the acute effects of oral MB204 on Tau phosphorylation.
  • To assess MB204's efficacy in a mouse model of Tau hyperphosphorylation.

Main Methods:

  • CD-1 male mice were administered MB204 (2.5 mg/kg, p.o.) or lithium chloride (LiCl) daily for three days.
  • Tau hyperphosphorylation was induced via anesthesia (isoflurane) after the final dose.
  • Brain tissue was analyzed using quantitative western blot for Tau phosphorylation epitopes.

Main Results:

  • MB204 significantly reduced Tau phosphorylation at multiple epitopes (AT270, AT8, pT205) in the cortex.
  • In the hippocampus, MB204 decreased phosphorylation at pS40K and AT8 epitopes.
  • Both MB204 and LiCl showed reductions in specific Tau phosphorylation sites, with distinct effects on certain epitopes.

Conclusions:

  • Acute oral MB204 treatment effectively reduced anesthesia-induced Tau hyperphosphorylation in mice.
  • MB204 demonstrated efficacy across key Tau phosphorylation epitopes relevant to AD.
  • These findings support MB204's potential as a therapeutic agent for Alzheimer's disease and related tauopathies.