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Basic Science and Pathogenesis.

Olga Kechko1, Dmitry Yanvarev1, Kirill Chaprov2

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russian Federation.

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Summary
This summary is machine-generated.

A novel peptide, HAEEPGP, effectively crosses the blood-brain barrier and targets beta-amyloid plaques, showing promise for Alzheimer's disease (AD) treatment by reducing pathology and improving outcomes in AD models.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Current Alzheimer's disease (AD) treatments, like anti-beta-amyloid (Aβ) antibodies, face limitations including side effects and poor blood-brain barrier (BBB) penetration.
  • Short peptides offer a potential alternative, with HAEE tetrapeptide demonstrating BBB crossing and plaque reduction without toxicity, but suffering from rapid elimination.
  • This study aimed to enhance peptide stability and therapeutic efficacy by conjugating PGP amino acids to HAEE.

Purpose of the Study:

  • To develop a stabilized peptide, HAEEPGP, for improved Alzheimer's disease (AD) therapy.
  • To investigate the pharmacokinetics, BBB penetration, and Aβ binding of HAEEPGP.
  • To evaluate the efficacy of HAEEPGP in mitigating AD-associated pathology in vitro and in vivo.

Main Methods:

  • Isothermal titration calorimetry to assess HAEEPGP binding to Aβ.
  • Pharmacokinetic and tissue distribution studies of 125I-labeled HAEEPGP in mice.
  • In vitro assays using microglial cells to evaluate Aβ-induced inflammation and redox changes.
  • In vivo studies in AD transgenic nematodes and 5xFAD mice to assess plaque load and behavioral deficits.

Main Results:

  • PGP conjugation increased HAEEPGP plasma half-life from 17 to 56±12 min, enhancing stability.
  • HAEEPGP effectively crossed the BBB, with higher brain concentrations observed in 5xFAD mice.
  • The peptide demonstrated specific binding to Aβ and its isomerized form, with enhanced binding in the presence of zinc ions.
  • HAEEPGP reduced Aβ-induced microglial inflammation, extended nematode lifespan, and ameliorated cognitive decline and plaque burden in 5xFAD mice.

Conclusions:

  • The stabilized peptide HAEEPGP successfully crosses the BBB and binds to pathological Aβ species.
  • HAEEPGP demonstrates significant therapeutic potential by inhibiting AD-related pathologies in cellular, nematode, and mouse models.
  • HAEEPGP represents a promising candidate for future Alzheimer's disease treatment strategies.