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Related Experiment Videos

109Cd transport in rat brain.

A Takeda1, S Takefuta, H Ijiro

  • 1Department of Radiobiochemistry, School of Pharmaceutical Sciences, University of Shizuoka, Yada, Japan. takedaa@u-shizuoka-ken.ac.jp

Brain Research Bulletin
|September 14, 1999
PubMed
Summary
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Cadmium (Cd) has limited brain entry, being blocked by the blood-brain and blood-cerebrospinal fluid barriers. It also shows restricted movement within brain extracellular fluid, indicating significant barriers to its distribution.

Area of Science:

  • Neuroscience
  • Toxicology
  • Biochemistry

Background:

  • The brain's protective barriers, including the blood-brain barrier (BBB) and blood-cerebrospinal fluid (BCSFB) barrier, strictly regulate substance entry.
  • Understanding cadmium (Cd) distribution is crucial for assessing its neurotoxicity and potential health risks.

Purpose of the Study:

  • To investigate the brain distribution of cadmium (Cd) after administration via different routes.
  • To clarify the permeability of brain barrier systems to Cd.
  • To understand Cd movement within the cerebrospinal fluid (CSF) and brain extracellular fluid (ECF).

Main Methods:

  • Administration of 109CdCl2 (a radioactive cadmium isotope) into the tail vein, lateral ventricle, or olfactory bulb of experimental subjects.
  • Quantification of 109Cd distribution in various brain regions and cerebrospinal fluid at different time points post-administration.

Related Experiment Videos

  • Analysis of Cd penetration and movement across brain barriers and within brain compartments.

    • Main Results:

    • Intravenous (i.v.) injection showed high 109Cd concentration in the choroid plexus, with low levels in most brain parenchyma, except circumventricular organs.
    • After 6 days, i.v. 109Cd remained high in the choroid plexus and was detected in the pineal gland and median eminence region.
    • Lateral ventricle injection resulted in 109Cd accumulation within the ventricular system, with minimal brain parenchyma penetration.
    • Olfactory bulb injection led to localized 109Cd accumulation, with limited spread in the brain extracellular space.
    • These findings indicate that Cd faces significant barriers to entry and movement within the brain.

    Conclusions:

    • Cadmium (Cd) penetration into the brain parenchyma is severely restricted by the blood-brain barrier, blood-CSF barrier, ependymal, and pial surfaces.
    • Cd exhibits limited mobility within the brain's extracellular fluid, suggesting localized uptake rather than widespread diffusion.
    • The study highlights the effectiveness of brain barriers in limiting cadmium exposure to neural tissues.