Jul 22, 2009

Altered myelination and axonal integrity in adults with childhood lead exposure: a diffusion tensor imaging study

Neurotoxicology
Christopher J BrubakerKim M Cecil

Abstract

Childhood lead exposure is associated with adverse cognitive, neurobehavioral and motor outcomes, suggesting altered brain structure and function. The purpose of this work was to assess the long-term impact of childhood lead exposure on white matter integrity in young adults. We hypothesized that childhood lead exposure would alter adult white matter architecture via deficits in axonal integrity and myelin organization. Adults (22.9+/-1.5 years, range 20.0-26.1 years) from the Cincinnati Lead Study were recruited to undergo a study employing diffusion tensor imaging (DTI). The anatomic regions of association between water diffusion characteristics in white matter and mean childhood blood lead level were determined for 91 participants (52 female). Fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) were measured on an exploratory voxel-wise basis. In adjusted analyses, mean childhood blood lead levels were associated with decreased FA throughout white matter. Regions of the corona radiata demonstrated highly significant lead-associated decreases in FA and AD and increases in MD and RD. The genu, body, and splenium of the corpus callosum demonstrated highly significant lead-assoc...Continue Reading

  • References35
  • Citations41

References

Mentioned in this Paper

Biologic Segmentation
Brain Diseases
Structure of Body of Corpus Callosum
Lymphoma, Non-Hodgkin
Blood Lead
Entire Brainstem
Tract
Myelin Sheath
Malignant Neoplasm of Spinal Cord
Neurons

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