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The Blood-brain Barrier00:49

The Blood-brain Barrier

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A Next-Generation Brain-Targeting Peptide: KS-487 Rivals Angiopep-2 in BBB Penetration with Enhanced Selectivity.

Kensuke Asukabe1, Nagi Yamashita1, Runa Fujimoto2

  • 1Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, 923-1292 Ishikawa, Japan.

Bioconjugate Chemistry
|September 11, 2025
PubMed
Summary
This summary is machine-generated.

KS-487, a cyclic peptide, shows excellent blood-brain barrier permeability and higher brain selectivity than Angiopep-2. This peptide is a promising candidate for targeted drug delivery to the brain with a strong safety profile.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biotechnology

Background:

  • The blood-brain barrier (BBB) restricts the entry of therapeutic agents into the brain.
  • Low-density lipoprotein receptor-related protein 1 (LRP1) is a key target for enhancing BBB permeability.
  • Peptides that bind LRP1 are being investigated for brain drug delivery.

Purpose of the Study:

  • To compare the in vivo blood-brain barrier (BBB) permeability and brain selectivity of KS-487 with Angiopep-2 (ANG2).
  • To evaluate the safety profile of KS-487 for potential therapeutic applications.

Main Methods:

  • Indocyanine green (ICG)-labeled KS-487 and ANG2 were administered subcutaneously to mice.
  • Biodistribution was assessed using in vivo imaging at 24, 48, and 72 hours.
  • Brain selectivity was determined by comparing brain and liver accumulation ratios.

Main Results:

  • ICG-KS-487 and ICG-ANG2 exhibited comparable brain permeability and similar time-course profiles.
  • ICG-KS-487 demonstrated significantly greater brain selectivity compared to ICG-ANG2.
  • No adverse effects were observed in mice treated with ICG-KS-487.

Conclusions:

  • KS-487 possesses superior brain-targeting properties and a favorable safety profile.
  • KS-487 shows potential as an effective targeting ligand for drug delivery across the BBB for brain disorders.