Abstract
In an endemic fluorosis area, 16 fetuses that were delivered during their sixth to eighth month of gestation by means of artificial abortion were collected and studied. The results [compared to 10 control fetuses from a non-endemic area] show that fluorine levels in tissues are obviously high, especially in brain, calvarium, and femur. The activity of alkaline phosphatase in femur and kidney was raised. By observation of the ultrastructure of samples, the number of mitochondria, rough-surfaced endoplasmic reticulum, and free ribosome in neurons of cerebral cortex were reduced, and the rough-surfaced endoplasmic reticulum was obviously dilated. These findings indicate that the neurons of the cerebral cortex in the developing brain may be one of the targets of fluorine.
Translated by Julian Brooke for Fluoride Action Network and published with the permission of the Chinese Journal of Control of Endemic Diseases 1989;4(3):136-8 in the journal Fluoride.
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Determination of the contents of amino-acid and monoamine neurotransmitters in fetal brains from a fluorosis-endemic area.
The contents of five types of amino-acid neurotransmitters and three types of monoamine neurotransmitters in the brains of fetuses aborted through induced labor in a chronic fluorosis-endemic area were determined. Findings revealed that the content of the excitatory amino acid, aspartic acid, was significantly lower than in the fetuses from
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The effect of fluorine on the developing human brain.
Fifteen fetuses from an endemic fluorosis area that were aborted therapeutically at the 5th–8th month of gestation were compared with 16 aborted fetuses from a non-endemic area. Stereological study of the brains showed that the numerical density of the neuron volume and the undifferentiated neuroblasts as well as the nucleus-cytoplasm ratio of the neurons were
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[Effects of sodium fluoride on the activity of Ca2+Mg(2+)-ATPase in synaptic membrane in rat brain].
Effects of sodium fluoride on Ca2+Mg(2+)-ATPase activity of synaptic membrane in rat brain were studied with in vitro or in vivo methods. Concentrations of sodium fluoride of 0.3, 1.6, 8.0, 20.0 and 40.0 mmol/L can significantly inhibit the activity of the enzyme with proportions of 6.6%, 18.0%, 41.0%, 55.5% and
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Behavioral teratology in rats exposed to fluoride.
A study was conducted of behavioral differences in Wistar rat pups born of dams drinking water containing 1.0, 5.0, and 25 mg F/L from the day of conception. A control group drank tap water containing 0.6 mg F/L. Among 18 litters in the 25 mg/L group, four of the dams
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Neurotransmitter and receptor changes in the brains of fetuses from areas of endemic fluorosis.
The levels of neurotransmitters and receptors in brain tissue of aborted fetuses from areas of endemic fluorosis were tested. The results showed that in 10 fetuses from a high fluoride area ranging in age from 5 to 7 months, the levels of norepinephrine, 5-hydroxytryptamine, and a1-receptor were lower, and the level of epinephrine was higher as compared with levels
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