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Grabody B, a novel molecular shuttle, enhances therapeutic delivery across the blood-brain barrier by utilizing multiple endocytosis pathways. This approach ensures sustained brain penetration, even in aged subjects, overcoming limitations of previous methods.

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Pharmacology

Background:

  • The blood-brain barrier (BBB) limits therapeutic delivery to the brain.
  • Molecular shuttles targeting receptors like transferrin receptor (TfR) and insulin-like growth factor receptor 1 (IGF1R) are developed to overcome BBB limitations.
  • The detailed trafficking mechanisms of these shuttles into brain endothelial cells (BECs) remain unclear.

Purpose of the Study:

  • To elucidate the trafficking mechanisms of the Grabody B molecular shuttle into brain endothelial cells.
  • To compare the endocytosis pathways utilized by Grabody B-fused bispecific antibodies (GB BsAbs) with those of TfR-targeted antibodies.
  • To investigate the efficacy of Grabody B in enhancing brain penetration, particularly in aged models.

Main Methods:

  • Monitoring Grabody B-mediated endocytosis in human BECs.
  • Analyzing the colocalization of GB BsAbs with F-actin, Clathrin, Caveolin, endophilin A2, and Rab5.
  • Comparing the brain penetration of GB BsAbs and monoclonal antibodies (mAbs) in young and aged mice.

Main Results:

  • GB BsAbs rapidly internalized within 30 seconds, closely associating with and reorganizing F-actin.
  • GB BsAbs utilized both Clathrin and Caveolin pathways, unlike TfR BsAbs which primarily use Clathrin.
  • GB BsAbs showed strong colocalization with endophilin A2, suggesting Fast-endophilin-mediated endocytosis (FEME) involvement, and exhibited comparable brain penetration in young and aged mice.

Conclusions:

  • Grabody B significantly improves therapeutic brain penetration by bypassing Blood-Brain Barrier (BBB) specific transcytosis routes.
  • Grabody B employs multiple transcytosis pathways, including Clathrin, Caveolin, and FEME.
  • This multi-pathway utilization enables sustained brain penetration in aged rodents, offering a promising strategy for treating neurological disorders.