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Methods Optimization for Routine Sciatic Nerve Processing in General Toxicity Studies.

Jessica S Fortin1,2, Elizabeth A Chlipala3, Daniel P Shaw1

  • 1Veterinary Medical Diagnostic Laboratory, University of Missouri, Columbia, MO, USA.

Toxicologic Pathology
|May 24, 2019
PubMed
Summary
This summary is machine-generated.

Optimal preservation of peripheral nerves in animal toxicity studies requires prompt fixation, ideally within 3 hours post-mortem. Methanol-free 4% formaldehyde and a 35°C water bath during processing yield superior nerve fiber structural integrity in H&E-stained sections.

Keywords:
neuropathologyneurotoxicityperipheral nervous systemsciatic nervetissue processing

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Area of Science:

  • Veterinary Pathology
  • Toxicology
  • Histology

Background:

  • Current best practices offer guidance for peripheral nervous system sampling and processing in animal toxicity studies.
  • Optimizing nerve preservation in routine paraffin-embedded, hematoxylin and eosin (H&E)-stained sections is crucial for accurate toxicological assessments.

Purpose of the Study:

  • To investigate the impact of delayed fixation, fixative type, processing times, initial ethanol concentration, and water bath temperature on peripheral nerve preservation.
  • To identify optimal conditions for maintaining structural integrity of sciatic nerves from rats and pigs.

Main Methods:

  • Sciatic nerves from Wistar rats and domestic pigs were collected at 0, 3, 6, 12, or 24 hours post-mortem.
  • Tissues were fixed in neutral-buffered 10% formalin (NBF) or methanol-free 4% formaldehyde (MFF), then processed into paraffin.
  • Sections were stained with H&E after flattening on water baths set at 35°C, 40°C, or 45°C.

Main Results:

  • Optimal structural integrity was achieved when fixation occurred within 3 hours post-mortem, using either NBF or MFF.
  • Methanol-free 4% formaldehyde provided better structural preservation of nerve fibers compared to NBF.
  • Lowering the initial ethanol concentration to 50% and using a 35°C water bath improved nerve fiber preservation and reduced separation.

Conclusions:

  • Prompt fixation (within 3 hours) and the use of methanol-free 4% formaldehyde are recommended for superior peripheral nerve preservation.
  • Adjusting processing parameters, including initial ethanol concentration and water bath temperature, significantly enhances the quality of routinely prepared nerve sections for toxicity studies.