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Research ArticleArticle

Comparison of Blood-Brain Barrier Transport of Glial-Derived Neurotrophic Factor (GDNF) and an IgG-GDNF Fusion Protein in the Rhesus Monkey

Ruben J. Boado and William M. Pardridge
Drug Metabolism and Disposition December 2009, 37 (12) 2299-2304; DOI: https://doi.org/10.1124/dmd.109.028787
Ruben J. Boado
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William M. Pardridge
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Abstract

The brain drug development of glial-derived neurotrophic factor (GDNF) is prevented by the lack of transport of this protein across the blood-brain barrier (BBB). GDNF transport across the BBB can be made possible by re-engineering the neurotrophin as a fusion protein with a genetically engineered monoclonal antibody (MAb) against the human insulin receptor (HIR), which crosses the BBB on the endogenous insulin receptor. The present work was designed to compare the BBB transport in vivo of GDNF and the HIR MAb-GDNF fusion protein. Owing to species specificity of HIR MAb binding to the insulin receptor, the present studies were performed in the adult rhesus monkey. The brain uptake of human IgG1 was determined to assess the uptake of a brain plasma volume marker. The brain clearance of GDNF was no different from the clearance of the IgG1, which indicated GDNF does not cross the primate BBB in vivo. In contrast, BBB transport of the HIR MAb-GDNF fusion protein was shown with film and emulsion autoradiography, as well as the capillary depletion method. In parallel with the increased brain uptake, fusion of the GDNF to the HIR MAb resulted in a decrease in the uptake of GDNF by liver, spleen, and kidney. Administration of the HIR MAb-GDNF fusion protein had no effect on glycemic control. The brain uptake parameters show that a systemic dose of the HIR MAb-GDNF fusion protein of 0.2 mg/kg may generate a 10-fold increase in the cerebral concentration of GDNF in the human brain.

Footnotes

  • This work was supported in part by the National Institutes of Health National Institute of Neurological Disorders and Stroke [Grant R43-NS60176]; and the Michael J. Fox Foundation for Parkinson's Research.

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

    doi:10.1124/dmd.109.028787

  • GDNF
    glial-derived neurotrophic factor
    PD
    Parkinson's disease
    BBB
    blood-brain barrier
    CED
    convection-enhanced diffusion
    MAb
    monoclonal antibody
    HIR
    human insulin receptor
    PK
    pharmacokinetics
    hIgG1
    human IgG1
    TCA
    trichloroacetic acid
    VD
    volume of distribution
    ID
    injected dose
    AUC
    area under the plasma concentration curve
    ELISA
    enzyme-linked immunosorbent assay
    ECD
    extracellular domain
    TBS
    Tris-buffered saline
    TBST
    Tris-buffered saline/Tween 20.

    • Received June 4, 2009.
    • Accepted September 4, 2009.
  • Copyright © 2009 by The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 37 (12)
Drug Metabolism and Disposition
Vol. 37, Issue 12
1 Dec 2009
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Research ArticleArticle

Comparison of Blood-Brain Barrier Transport of Glial-Derived Neurotrophic Factor (GDNF) and an IgG-GDNF Fusion Protein in the Rhesus Monkey

Ruben J. Boado and William M. Pardridge
Drug Metabolism and Disposition December 1, 2009, 37 (12) 2299-2304; DOI: https://doi.org/10.1124/dmd.109.028787

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Research ArticleArticle

Comparison of Blood-Brain Barrier Transport of Glial-Derived Neurotrophic Factor (GDNF) and an IgG-GDNF Fusion Protein in the Rhesus Monkey

Ruben J. Boado and William M. Pardridge
Drug Metabolism and Disposition December 1, 2009, 37 (12) 2299-2304; DOI: https://doi.org/10.1124/dmd.109.028787
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