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Related Concept Videos

  • Biomedical And Clinical Sciences
  • Oncology And Carcinogenesis
  • Predictive And Prognostic Markers
  • Multidrug Resistance Protein 1 Protects The Choroid Plexus Epithelium And Contributes To The Blood-cerebrospinal Fluid Barrier.
  • Biomedical And Clinical Sciences
  • Oncology And Carcinogenesis
  • Predictive And Prognostic Markers
  • Multidrug Resistance Protein 1 Protects The Choroid Plexus Epithelium And Contributes To The Blood-cerebrospinal Fluid Barrier.

    • Related Experiment Videos

    Multidrug resistance protein 1 protects the choroid plexus epithelium and contributes to the blood-cerebrospinal fluid barrier.

    J Wijnholds1, E C deLange, G L Scheffer

    • 1Division of Molecular Biology and Center for Biomedical Genetics, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands.

    The Journal of Clinical Investigation
    |February 17, 2000

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    Multidrug resistance protein 1 (MRP1) limits drug distribution, protecting tissues from toxic accumulation. Its absence in mice significantly increased etoposide levels in the cerebrospinal fluid, highlighting its role in drug barriers.

    Related Experiment Videos

    Area of Science:

    • Pharmacology
    • Cell Biology
    • Toxicology

    Background:

    • Multidrug resistance protein 1 (MRP1) is a transporter protein involved in xenobiotic efflux.
    • Previous studies demonstrated Mrp1's protective role at various physiological barriers.

    Purpose of the Study:

    • To investigate the specific contribution of MRP1 to the pharmacokinetics and tissue distribution of etoposide.
    • To evaluate MRP1's role in the blood-cerebrospinal fluid barrier.

    Main Methods:

    • Generation and utilization of Mrp1/Mdr1a/Mdr1b triple-knockout (TKO) and Mdr1a/Mdr1b double-knockout (DKO) mice.
    • Assessment of etoposide tissue accumulation and toxicity in knockout mouse models.
    • Immunohistochemical analysis of MRP1 expression.
    • Cerebrospinal fluid (CSF) collection and etoposide level measurement in cannulated mice.

    Main Results:

    • TKO mice exhibited increased etoposide toxicity and accumulation in multiple tissues, including brown adipose tissue, colon, salivary gland, heart, and the female urogenital system.
    • MRP1 was localized to the oviduct, uterus, salivary gland, and choroid plexus (CP) epithelium.
    • Absence of MRP1 led to a ~10-fold increase in etoposide levels within the CSF.

    Conclusions:

    • MRP1 plays a significant role in limiting the tissue distribution of certain drugs like etoposide.
    • MRP1 contributes to the integrity of the blood-cerebrospinal fluid barrier, restricting drug entry into the central nervous system.