Abstract
The present study was undertaken to investigate the toxic effects of sodium fluoride (NaF) on sperm motility and abnormality. Treatment of epididymal sperm suspensions with different doses of NaF (0.1, 1, 10, and 100 mg/ml) significantly reduced sperm motility at 15- and 30-min time intervals. Further, incubation at the same concentrations of NaF for 5-, 10-, and 15-min time intervals decreased sperm motility in a dose- and time-dependent manner. The present investigation revealed for the first time the adverse effect of lower doses of NaF (0.1 mg/ml) on sperm motility. Further, higher doses of NaF (10 and 100 mg/ml) caused a complete loss of sperm motility with a concomitant increase in sperm abnormality, which reflected the toxic effect of NaF on spermatozoa and its capability in fertilization.
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Suppression of male reproduction in rats after exposure to sodium fluoride during early stages of development
Sodium fluoride (NaF), a widespread natural pollutant was given to sperm-positive female rats throughout gestation and lactation at a dose of 4.5 and 9.0 ppm via drinking water. The neonates were allowed to grow up to 90 days on tap water, and then sperm parameters, testicular steroidogenic marker enzyme activity
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Ultrastructural studies of spermiogenesis in rabbit exposed to chronic fluoride toxicity
OBJECTIVE: To address the role of fluoride in causing defects to spermatids and epididymal spermatozoa. METHODS: Male rabbits were treated with 10 mg NaF/kg body weight daily for 18 months and maintained under identical laboratory conditions along with the control rabbits not given NaF. Testis and epididymis (caput) were investigated
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Amelioration of fluoride toxicity in some accessory reproductive glands and spermatozoa of rat
Sodium fluoride (NaF) at a dose of 10 mg/kg body weight was administered orally to male rats (Rettus norvegicus) daily for 30 and 50 days to evaluate the effect of the physiology of some sex accessory glands and sperm functions. The effects of withdrawal upon cessation of NaF ingestion, and
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Microdose vasal injection of sodium fluoride in the rat
A single microdose (50 micrograms/50 microL) injection of sodium fluoride (NaF) into the vasa deferentia of adult male albino rats (Rattus norvegicus) caused arrest of spermatogenesis and absence of spermatozoa in the lumina of the seminiferous tubules of the testes, which consequently led to a decline in the sperm count
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Decreased in vitro fertility in male rats exposed to fluoride-induced oxidative stress damage and mitochondrial transmembrane potential loss
Fluorosis, caused by drinking water contamination with inorganic fluoride, is a public health problem in many areas around the world. The aim of the study was to evaluate the effect of environmentally relevant doses of fluoride on in vitro fertilization (IVF) capacity of spermatozoa, and its relationship to spermatozoa mitochondrial
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Fluoride's Effect on Male Reproductive System - Human Studies
Consistent with in vitro and animal research, studies of human populations have reported associations between fluoride exposure and damage to the male reproductive system. Most notably, a scientist at the Food & Drug Administration reported in 1994 that populations in the United States with more than 3 ppm fluoride in their water had lower "total fertility rates" than populations with lower fluoride levels.
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Fluoride's Effect on Male Reproductive System: Animal Studies
Over 60 studies on animals (including rats, mice, roosters, and rabbits) have found that fluoride adversely impacts the male reproductive system. These studies have repeatedly found the following effects: (1) decreases in testosterone levels; (2) reduced sperm motility; (3) altered sperm morphology; (4) reduced sperm quantity; (5) increased oxidative stress; (6) and reduced capacity to breed.
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Fluoride's Effect on Male Reproductive System -- The "Sprando/Collins" Anomaly
In contrast to the findings of over 60 animal studies from other research teams, a series of studies by FDA researchers Sprando & Collins reported virtually no evidence of reproductive toxicity among animals treated with very high levels of fluoride exposure. The reasons for this discrepancy remains unclear. Excerpts from Sprando/Collins' Studies: "This study
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Fluoride's Effect on the Male Reproductive System -- In Vitro Studies
Carefully controlled in vitro studies have found that direct exposure of fluoride to the testes or semen inhibits testosterone production and damages sperm. While researchers have known since the 1930s that mega concentrations of fluoride can completely (but reversibly) immobilize sperm, it was not until the 1970s and 1980s that researchers found that relatively modest concentrations of fluoride could cause damage prior to complete immobilization.
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