Abstract
This study was carried out to observe the effects of sodium fluoride on acetylcholinesterase (AChE) activities in the cerebral synaptic membranes (SPM) and the peripheral red blood cells (RBC) of rats by in vivo and in vitro experiments. In the in vivo study, pregnant rats ingested ad libitum fluorinated drinking water (5, 15, 50 ppm F-) during their gestation and lactation. It was shown that the AChE activities of the SPM and peripheral RBCs in maternal rats exposed 5-50 ppm F- for 60 days were elevated significantly by 30.0-67.6% and 12.5-31.9% in a dose-dependent manner, respectively. The AChE activities of their offspring 80 days after birth were also increased (8.7-28.7% for SPM and 20.6-32.4% for RBC). In contrast, the AChE activities of SPM in vitro were inhibited by 5.0-50.0 mmol F-/L treatment in a time- and dose-dependent manner. Analysis with the Hanes plots suggested that the enzymesubstrate kinetics are consistent with a mixed type of inhibition.
Excerpt:
These results indicate that fluoride may penetrate the blood brain barrier, interact with AChE located on cell membranes, and interfere with their physiological functions and thus induce the neurotoxicities.
Print 
PDF-
-
[Studies on fluoride concentration and cholinesterase activity in rat hippocampus].
OBJECTIVE: To study the accumulation of fluoride in rat hippocampus and its effect on cholinesterase activity. METHODS: Rats were subchronically exposed to NaF, and fluoride concentration and cholinesterase activity in rat hippocampus were determined. RESULTS: Fluoride concentration in rat hippocampus was significantly correlated with the dosage of fluoride, and there
-
Alterations in plasma and tissue acetylcholinesterase activity following repeated oral exposure of chlorpyrifos alone and in conjunction with fluoride in Wistar Rats
Concurrent exposures of more than one environmental contaminants are commonly encountered by human beings and animals. This study investigated the effect of chlorpyrifos alone and in conjunction with fluoride on plasma and tissue acetylcholinesterase (AChE) activity in wistar rats. Fluoride at 1 or 10 ppm in drinking water produced significant (P < 0.05)
-
Confirmation of and explanations for elevated blood lead and other disorders in children exposed to water disinfection and fluoridation chemicals
Silicofluorides (SiFs), fluosilicic acid (FSA) and sodium fluosilicate (NaFSA), are used to fluoridate over 90% of US fluoridated municipal water supplies. Living in communities with silicofluoride treated water (SiFW) is associated with two neurotoxic effects: (1) Prevalence of children with elevated blood lead (PbB>10microg/dL) is about double that in non-fluoridated
-
Effects of fluoride on learning and memory and cholinesterase activity in rat brains.
Objective: To study the role of fluorosis on learning and memory in rat and its possible mechanisms; to explore the correlation between cholinesterase activity and the level of intelligence. Methods: SD rats divides into 3 group of stochastically according to the sex and the body weight, control group treated with
-
Effects of sodium fluoride on locomotor behavior and a few biochemical parameters in rats
Spontaneous motor activity and motor coordination were tested in adult female rats after treating with sodium fluoride at 20 or 40 mg/kg dose level daily for 60 days, using an activity chamber and a rota-rod apparatus, respectively. Total protein concentrations were determined in skeletal muscle, liver and serum of similarly
Related Studies :
-
-
-
Fluoride's Direct Effects on Brain: Animal Studies
The possibility that fluoride ingestion may impair intelligence and other indices of neurological function is supported by a vast body of animal research, including over 40 studies that have investigated fluoride's effects on brain quality in animals. As discussed by the National Research Council, the studies have consistently demonstrated that fluoride, at widely varying concentrations, is toxic to the brain.
-
Fluoride Affects Learning & Memory in Animals
An association between elevated fluoride exposure and reduced intelligence has now been observed in 65 IQ studies. Although a link between fluoride and intelligence might initially seem surprising or random, it is actually consistent with a large body of animal research. This animal research includes the following 45 studies (out
-
Fluoride's Effect on Fetal Brain
The human placenta does not prevent the passage of fluoride from a pregnant mother's bloodstream to the fetus. As a result, a fetus can be harmed by fluoride ingested pregnancy. Based on research from China, the fetal brain is one of the organs susceptible to fluoride poisoning. As highlighted by the excerpts
-
NRC (2006): Fluoride's Neurotoxicity and Neurobehavioral Effects
The NRC's analysis on fluoride and the brain.
-
Fluoride: Developmental Neurotoxicity.
Developmental Neurotoxicity There has been a tremendous amount of research done on the association of exposure to fluoride with developmental neurotoxicity. There are over 60 studies reporting reduced IQ in children and several on the impaired learning/memory in animals. And there are studies which link fluoride to Attention Deficit Hyperactivity Disorder. Teaching
Related FAN Content :
-