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Combining 4% NaCl with 25% mannitol safely enhances osmotic blood-brain barrier opening (OBBBO) in mice. This improved technique shows promise for delivering therapeutics across the blood-brain barrier (BBB).

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Area of Science:

  • Neuroscience
  • Radiology
  • Pharmacology

Background:

  • Developing strategies to enhance drug delivery across the blood-brain barrier (BBB) is crucial for treating central nervous system disorders.
  • Osmotic blood-brain barrier opening (OBBBO) using intra-arterial 25% mannitol is a safe, partially effective technique.
  • There is a need for improved methods to increase BBB permeability for therapeutic agents.

Purpose of the Study:

  • To evaluate the efficacy and safety of combining 25% mannitol with 4% NaCl to enhance OBBBO.
  • To assess the increased osmotic power of the 4% NaCl and 25% mannitol combination.
  • To compare the efficacy of the new combination against standard 25% mannitol for brain drug delivery.

Main Methods:

  • OBBBO was induced in mice (n=44) using intra-arterial, intravenous, or intraperitoneal infusion of 25% mannitol with or without 4% NaCl.
  • Brain penetration of small molecules (gadolinium-based contrast agent) and large molecules (zirconium 89-radiolabeled antibodies) was assessed using MRI, histology, and PET imaging.
  • Statistical analysis included Wilcoxon signed rank test, Mann-Whitney U test, and mixed-model analysis.

Main Results:

  • The combination of 4% NaCl and 25% mannitol resulted in significantly larger OBBBO areas compared to 25% mannitol alone (1.99 vs 1.41, P < .001).
  • MRI and histologic examination confirmed the safety of the combined infusion procedure.
  • PET imaging demonstrated significantly improved brain uptake of radiolabeled antibodies with the new method.

Conclusions:

  • Combining 4% NaCl with 25% mannitol is a safe and effective method to enhance OBBBO.
  • This enhanced OBBBO technique shows significant potential for improving the endovascular delivery of therapeutic agents to the brain.
  • Further research may lead to improved treatments for CNS disorders through enhanced drug penetration.