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LM11A-31, a small molecule p75 neurotrophin receptor (p75NTR) modulator, reduces synaptic and glial pathology in Alzheimer's disease models. This drug counteracts amyloid and tau-driven degeneration, showing promise for treating neurodegenerative diseases.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) and related dementias (ADRDs) involve amyloid, tau pathology, and glial dysfunction, leading to synaptic failure.
  • The p75 neurotrophin receptor (p75NTR) promotes degenerative signaling contributing to synaptic damage in AD/ADRDs.
  • LM11A-31 is an orally bioavailable small molecule that modulates p75NTR, downregulating degenerative and upregulating trophic signaling.

Purpose of the Study:

  • To investigate the effects of LM11A-31, a p75NTR modulator, on neuronal and glial pathways implicated in synaptic degeneration.
  • To assess the therapeutic potential of targeting p75NTR signaling in preclinical models of AD/ADRDs.

Main Methods:

  • LM11A-31 was applied to in vitro neuronal and glial models exposed to amyloid-beta or tau oligomers.
  • Studies included APP-based (APP-Lon/Swe) and tau-based (PS19) mouse models.
  • Evaluated outcomes encompassed signaling pathways, mitochondrial function, RNA sequencing, morphology, synaptic function, behavior, and biomarkers.

Main Results:

  • LM11A-31 counteracted amyloid-, tau-, and glial-mediated degenerative signaling.
  • Observed reductions in synaptic degeneration, pathological tau accumulation, glial abnormalities, and behavioral deficits.
  • Normalized AD-related transcriptomic signatures and reduced brain p-tau217 accumulation.

Conclusions:

  • Modulating p75NTR signaling effectively reduces synaptic and glial pathology in AD/ADRD models.
  • Transcriptomic data suggest overlap between mouse findings and human AD mechanisms.
  • Preclinical results align with clinical findings from a Phase 2a trial of LM11A-31 in mild-to-moderate AD patients.