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Does lithium poisoning induce brain injuries?-A histopathological rat study.

Mathieu Klein1, Vanessa Naffaa1, Lucie Chevillard1

  • 1Université Paris Cité, Inserm UMRS-1144, Paris, France.

Basic & Clinical Pharmacology & Toxicology
|February 22, 2023
PubMed
Summary

Lithium neurotoxicity is generally reversible. This study found no brain lesions or significant cell count changes in rats, even with prolonged or toxic lithium exposure, suggesting brain injury is not common.

Keywords:
SILENTlithiummicroscopyneurotoxicitypoisoning

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Area of Science:

  • Neuroscience
  • Toxicology
  • Pharmacology

Background:

  • Prolonged lithium treatment or overdose can cause neurotoxicity.
  • While often reversible, rare cases suggest irreversible lithium-effectuated neurotoxicity (SILENT) with severe poisoning.
  • Previous studies reported histopathological brain changes in rats after acute lithium exposure.

Purpose of the Study:

  • To investigate the histopathological effects of lithium exposure in rat models.
  • To mimic prolonged treatment and acute, acute-on-chronic, and chronic poisoning patterns seen in humans.
  • To determine if lithium exposure causes irreversible brain injury.

Main Methods:

  • Histopathology and immunostaining analyses were performed on rat brains.
  • Male Sprague-Dawley rats were used, assigned to lithium or saline (control) groups.
  • Treatment models mimicked therapeutic, acute toxic, acute-on-chronic toxic, and chronic toxic lithium exposure.

Main Results:

  • No brain lesions were observed in any lithium-treated rats across all models.
  • There were no significant differences in neuron or astrocyte counts between lithium-treated rats and controls.
  • Histopathological examination did not reveal neuronal vacuolization, spongiosis, or aging-like neurodegeneration.

Conclusions:

  • Lithium-induced neurotoxicity appears to be reversible.
  • Brain injury is not a common feature of lithium toxicity, even under prolonged or toxic exposure conditions.
  • Findings challenge the concept of widespread irreversible lithium-induced brain damage.