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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Updated: Jun 19, 2025

Antibody Binding Specificity for Kappa (V&#954;) Light Chain-containing Human (IgM) Antibodies: Polysialic Acid (PSA) Attached to NCAM as a Case Study
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Exploring How Antibody Format Drives Clearance from the Brain.

Kelly Schwinghamer1, Brian M Kopec1, Ebehiremen Ayewoh2

  • 1Department of Pharmaceutical Chemistry, The University of Kansas, 2093 Constant Ave., Lawrence, Kansas 66046, United States.

Molecular Pharmaceutics
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Blood-brain barrier (BBB) modulators enhance antibody delivery to the brain, but clearance remains rapid. Optimizing antibody format, like using antibody fragments, significantly improves brain exposure for treating neurological diseases.

Keywords:
FcRnand hyaluronic binding.antibody brain deliveryantibody clearanceblood-brain barrierblood-brain barrier modulatorcentral nervous systemintracerebroventricularpharmacokinetics

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Biotechnology

Background:

  • Monoclonal antibodies (mAbs) show promise for brain disease treatment due to high specificity.
  • Poor blood-brain barrier (BBB) penetration and rapid central nervous system (CNS) clearance limit mAb efficacy in the brain.
  • Blood-brain barrier modulator (BBBM) peptides have been identified to enhance mAb BBB penetration.

Purpose of the Study:

  • To investigate the pharmacokinetics of mAbs delivered to the brain using BBBMs via intravenous (IV) administration.
  • To explore how antibody format (size, FcRn binding, hyaluronic acid binding) affects brain clearance after intracerebroventricular (ICV) injection.
  • To identify strategies for improving therapeutic antibody retention in the CNS.

Main Methods:

  • IRDye800CW-labeled antibodies were administered to C57BL/6 mice via IV or ICV injection.
  • Organ concentrations of labeled antibodies were measured at various time points post-administration.
  • Pharmacokinetic analysis was performed comparing different antibody formats and co-administration with BBBM peptides.

Main Results:

  • Coadministration of a mAb with a BBBM peptide increased BBB permeation but resulted in rapid brain clearance (within 2 hours).
  • Intracerebroventricular injection showed that antibody Fab fragments achieved higher brain exposure than intact mAbs.
  • A Fab fragment fused to a hyaluronic acid binding domain (Fab-VG1) demonstrated significantly improved brain exposure.

Conclusions:

  • BBBM peptides can enhance initial antibody permeation across the BBB.
  • Antibody format optimization, particularly using antibody fragments like Fab-VG1, is crucial for improving brain exposure and retention.
  • Combining BBBMs with optimized antibody formats presents a promising strategy for enhancing brain delivery of therapeutics.