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Drug Development.

Kathryn A Haynes1, Zackery A Cope1, Sean-Paul Gerard Williams1

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Summary
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Alzheimer's antibody treatments reduced amyloid in mice, but effects varied by sex and did not improve cognition. Further research is needed to understand these differences for better Alzheimer's disease (AD) therapeutics.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Alzheimer's disease (AD) treatments targeting amyloid are debated due to variable efficacy and sex-specific effects.
  • Females have a higher risk of AD, necessitating understanding of treatment benefits and limitations in both sexes.
  • This study characterized chimeric Aducanumab (chAducanumab) in a preclinical model.

Purpose of the Study:

  • To evaluate the pharmacokinetic (PK), pharmacodynamic (PD), and behavioral effects of chronic chAducanumab administration in 5XFAD mice.
  • To compare the effects of chAducanumab to a control antibody (IgG) and saline.
  • To investigate potential sex-dependent differences in response to amyloid-targeting therapy.

Main Methods:

  • 5XFAD mice received weekly intraperitoneal injections of chAducanumab, IgG, or saline.
  • Brain and plasma chAducanumab levels were quantified using mass spectrometry.
  • Amyloid-beta (Aβ) levels, PET imaging, and behavioral tests were performed. Anti-drug antibodies were assessed.

Main Results:

  • chAducanumab and IgG reduced plasma and brain Aβ, with greater effects observed in males than females.
  • chAducanumab was detectable in plasma and brain homogenates in a dose-dependent manner.
  • Amyloid plaque reduction did not correlate with significant cognitive or healthspan improvements. Variability in PD responses was linked to anti-drug antibodies.

Conclusions:

  • Sex-dependent differences in amyloid plaque clearance by monoclonal antibodies are consistent across species.
  • Interactions with IgG may influence both amyloid-lowering effects and adverse events.
  • These findings will guide future evaluations of novel AD therapeutics, especially concerning sex differences and disease progression after amyloid reduction.