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Related Experiment Videos

1,3-Dinitrobenzene-induced encephalopathy in rats.

M A Philbert1, C C Nolan, J E Cremer

  • 1Toxicology Unit, Medical Research Council Laboratories, Carshalton, Surrey, UK.

Neuropathology and Applied Neurobiology
|September 1, 1987
PubMed
Summary

Exposure to 1,3-dinitrobenzene (1,3-DNB) causes neurological symptoms and brain lesions in rats, mimicking thiamine deficiency. This suggests 1,3-DNB disrupts cellular energy metabolism, impacting glucose oxidation.

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Area of Science:

  • Toxicology
  • Neuroscience
  • Biochemistry

Background:

  • 1,3-dinitrobenzene (1,3-DNB) exposure in humans causes methaemoglobinaemia and nervous system symptoms.
  • Animal studies show 1,3-DNB induces methaemoglobinaemia and ataxia.

Purpose of the Study:

  • To investigate the neuropathological effects of 1,3-DNB exposure in rats.
  • To elucidate the cellular mechanisms underlying 1,3-DNB-induced neurotoxicity.

Main Methods:

  • Oral administration of 1,3-DNB to conventional and germ-free rats.
  • Light and electron microscopy of brain tissue.
  • Histopathological examination for lesions and hemorrhages.

Main Results:

  • 1,3-DNB exposure caused acute thiamine deficiency-like lesions in rat brain stems.

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  • Lesions involved cerebellar roof, vestibular, and superior olivary nuclei, and inferior colliculi.
  • Cellular targets included astrocytes, oligodendrocytes, and vascular elements, with secondary neuronal damage.

    • Conclusions:

    • 1,3-DNB induces significant neuropathology in rats, characterized by specific brainstem lesions.
    • The observed lesions resemble those seen in thiamine deficiency.
    • It is proposed that 1,3-DNB interferes with intracellular redox mechanisms, impairing glucose oxidation and leading to neurotoxicity.