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Recommended Methods for Brain Processing and Quantitative Analysis in Rodent Developmental Neurotoxicity Studies.

Robert H Garman1, Abby A Li2, Wolfgang Kaufmann3

  • 1Consultants in Veterinary Pathology, Inc., Murrysville, Pennsylvania, USA vetpathol@cs.com.

Toxicologic Pathology
|August 23, 2015
PubMed
Summary

Standardizing neuropathology in rodent developmental neurotoxicity (DNT) studies ensures reliable morphometric measurements. This approach minimizes bias and enhances the interpretation of DNT findings for regulatory assessment.

Keywords:
GLPdevelopmental neurotoxicityhistotechnologymorphometryneuroanatomyneuropathologyregulatory science

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Area of Science:

  • Neuroscience
  • Toxicology
  • Pathology

Background:

  • Neuropathology methods in rodent developmental neurotoxicity (DNT) studies require standardization.
  • Evolving regulatory guidance necessitates updated DNT evaluation principles.

Purpose of the Study:

  • To promote standardized neuropathology evaluation in DNT studies.
  • To enhance the reproducibility of morphometric measurements and brain section procurement.

Main Methods:

  • Utilizing a counterbalanced design for processing brains from all animals.
  • Anchoring morphometric measurements by reliable neuroanatomic landmarks.
  • Including digital images for anatomically matched section verification.

Main Results:

  • Standardized methods yield highly homologous brain sections and reproducible morphometric data.
  • Common DNT findings include altered cell numbers, displaced cells, and aberrant differentiation.
  • Digital imaging confirms quantitative analysis on matched sections.

Conclusions:

  • An integrative, weight-of-evidence approach is crucial for interpreting DNT neuropathology data.
  • Consideration of maternal toxicity, body weight, brain weight, and cross-regional findings is essential.
  • Standardized DNT neuropathology improves data reliability and regulatory assessment.