Memory impairment induced by sodium fluoride is associated with changes in brain monoamine levels

Neurotox Res. 2011 Jan;19(1):55-62. doi: 10.1007/s12640-009-9139-5. Epub 2009 Dec 3.

Abstract

Previous studies suggest that sodium fluoride (NaF) can impair performance in some memory tasks, such as open-field habituation and two-way active avoidance. In the present study, we evaluated the effect of NaF intake (100 ppm in drinking water for 30 days) and its short-term (15 days) withdrawal on open-field habituation and brain monoamine level. Adult male rats were allocated to three groups: tap water (NaF 1.54 ppm) for 45 days (control group); 15 days of tap water followed by NaF for 30 days; and NaF for 30 days followed by 15 days of tap water. The results showed that NaF impairs open-field habituation and increases noradrenaline (NA) and serotonin (5-HT) in the striatum, hippocampus and neocortex. Dopamine (DA) increase was restricted to the striatum. Short-term NaF withdrawal did not reverse these NaF-induced changes, and both NaF treatments led to a mild fluorosis in rat incisors. No treatment effect was seen in body weight or fluid/water consumption. These results indicate that sodium fluoride induces memory impairment that outlasts short-term NaF withdrawal (2 weeks) and may be associated with NA and 5-HT increases in discrete brain regions.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biogenic Monoamines / metabolism
  • Brain / drug effects
  • Brain / metabolism*
  • Dopamine / metabolism*
  • Male
  • Memory Disorders / chemically induced
  • Memory Disorders / metabolism*
  • Motor Activity / drug effects
  • Motor Activity / physiology
  • Norepinephrine / metabolism*
  • Random Allocation
  • Rats
  • Rats, Wistar
  • Serotonin / metabolism*
  • Sodium Fluoride / toxicity*

Substances

  • Biogenic Monoamines
  • Serotonin
  • Sodium Fluoride
  • Dopamine
  • Norepinephrine