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Heterogeneous visceral nerve changes in acrylamide intoxication.

G L Ferri1, S Zareh, M Sbraccia

  • 1Department of Cytomorphology, University of Cagliari, Italy.

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Acrylamide intoxication causes distinct cytoskeletal changes in rat visceral nerves, with neurofilament accumulation in some nerve types but not others. This suggests varying susceptibility and degradation patterns across different nerve fibers.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Cell Biology

Background:

  • Acrylamide is a neurotoxin known to affect the nervous system.
  • Intermediate filaments, particularly neurofilaments, are crucial components of neuronal structure and function.
  • Visceral nerves innervate internal organs and play vital roles in physiological processes.

Purpose of the Study:

  • To investigate the effects of acrylamide intoxication on the cytoskeletal organization of various visceral nerves in rats.
  • To identify specific patterns of neurofilament accumulation and axonal changes in response to acrylamide exposure.
  • To explore the heterogeneity in cytoskeletal responses among different types of visceral nerve fibers.

Main Methods:

  • Intermediate filament immunocytochemistry was employed to study visceral nerves in acrylamide-intoxicated rats.
  • Neurofilament protein-like material and glial fibrillary acidic protein (GFAP) immunoreactivity were assessed.
  • Morphological changes in motor end-plates, sensory fibers, nerve terminals, and enteric glial cells were examined.

Main Results:

  • Acrylamide induced invasion and deformation of motor end-plates by neurofilament material.
  • Accumulation of neurofilament material was observed in afferent fibers of diaphragmatic neuromuscular spindles and iris sensory fibers.
  • Changes included pre-terminal alterations in corneal and myenteric nerves, gut nerve lesions, and altered bladder nerve morphology.
  • Enteric glial cells exhibited coarse morphology and increased GFAP immunoreactivity.

Conclusions:

  • Acrylamide exposure leads to selective axonal changes in visceral nerves, highlighting cytoskeletal heterogeneity.
  • The findings suggest differential susceptibility and neurofilament degradation sites along various visceral nerve axons.
  • Acrylamide's proposed inhibition of neurofilament degradation may contribute to these observed non-uniform axonal changes.