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Related Experiment Videos

Increased lipophilicity and subsequent cell partitioning decrease passive transcellular diffusion of novel, highly

G A Sawada1, C L Barsuhn, B S Lutzke

  • 1Drug Absorption and Transport, Pharmacia & Upjohn, Inc., Kalamazoo, Michigan 49007, USA.

The Journal of Pharmacology and Experimental Therapeutics
|February 23, 1999
PubMed
Summary

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Novel pyrrolopyrimidines show promise as neuroprotective antioxidants. Their brain penetration depends on lipophilicity and structural modifications, impacting treatment efficacy for central nervous system disorders.

Area of Science:

  • Neuroscience
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Oxidative stress contributes to acute and chronic central nervous system (CNS) disorders.
  • Pyrrolopyrimidines are investigated as potential therapeutic agents due to their antioxidant properties.
  • Developing CNS-penetrant drugs is crucial for treating brain injuries and neurodegenerative diseases.

Purpose of the Study:

  • To investigate the structure-permeability relationship of novel 2,4-diamino-pyrrolo[2,3-d]pyrimidines.
  • To predict brain penetration and residence time of these compounds based on their lipophilicity.
  • To identify lead candidates with optimal properties for oral dosing and CNS delivery.

Main Methods:

  • Synthesis and examination of a homologous series of 26 lipophilic pyrrolopyrimidines.

Related Experiment Videos

  • Utilized cultured cell monolayers to assess transepithelial permeability.
  • Analyzed the influence of pyrrole substitutions on cell partitioning and permeability.

    • Main Results:

    • Pyrrolopyrimidines demonstrated potent inhibition of lipid peroxidation and cytoprotective effects.
    • Transepithelial permeability was inversely related to lipophilicity and cell partitioning.
    • Specific pyrrole substitutions modulated partitioning and permeability, impacting brain penetration potential.
    • In vitro models underestimated in vivo bioavailability of highly lipophilic compounds without acceptors.

    Conclusions:

    • Pyrrolopyrimidine derivatives are effective membrane-interactive antioxidants with neuroprotective potential.
    • Optimizing lipophilicity and pyrrole substitutions is key for enhancing brain penetration.
    • In vitro models require adjustments, such as adding serum proteins, to accurately predict in vivo bioavailability of lipophilic compounds.