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• W1965595172 abstract "High-dose boric acid (BA) produces testicular lesions in adult rats, characterized by inhibited spermiation followed by atrophy. The present study addressed whether inhibited spermiation can be separated from atrophy based on dose, compared testis boron (B) dosimetry to lesion development, determined how inhibited spermiation was reflected by common reproductive endpoints, and examined reversibility of the testicular lesions. Rats were fed 3000, 4500, 6000, or 9000 ppm BA for up to 9 weeks and examined. Recovery was assessed for up to 32 weeks post treatment. Inhibited spermiation could be separated from atrophy based on dose (inhibited spermiation: 3000/4500 ppm; atrophy: 6000/9000 ppm), with each lesion aspect expressed at different threshold testis B concentrations (inhibited spermiation: 5.6 μg B/g and atrophy: 11.9 μg B/g) with no B accumulation during the 9-week exposure. These data suggest that separate mechanisms may be operating for these lesion aspects based on testis B concentration and that B dose rate was important for testicular toxicity. Inhibited spermiation was most reliably reflected by informed testicular histology, with the more severe cases decreasing epididymal sperm count to levels that could affect fertility. After treatment, serum and testis B levels in all dose groups rapidly fell to background levels at the earliest time points evaluated (7 days and 8 weeks posttreatment, respectively). The severely inhibited spermiation at 4500 ppm was resolved by 16 weeks posttreatment, but areas of focal atrophy were detected that did not recover posttreatment. Also, no signs of recovery from atrophy were observed (6000 and 9000 ppm). Atrophic tubules contained a normal complement of spermatogonia (2.6 to 2.9 germ cells/100 Sertoli cells), with occasional dividing and degenerating germ cells. Elevations in serum FSH and LH levels suggested an intact hormonal response to the atrophy. In summary, 1) the different aspects of the BA-induced testicular lesion can be separated using different doses, 2) inhibited spermiation does not necessarily proceed to atrophy, and 3) there is no recovery from the atrophy despite the absence of testis B after treatment. The ability to separate inhibited spermiation from atrophy based on dose and testis B dosimetry will be useful in evaluating possible mechanisms. Furthermore, the presence of dividing spermatogonia during long-term BA-induced atrophy suggests that this model should be useful for identifying critical components involved in the reinitiation of spermatogenesis." @default.
• W1965595172 created "2016-06-24" @default.
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• W1965595172 date "1993-07-01" @default.
• W1965595172 modified "2023-10-04" @default.
• W1965595172 title "Testicular toxicity of boric acid (BA): Relationship of dose to lesion development and recovery in the F344 rat" @default.
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• W1965595172 doi "https://doi.org/10.1016/0890-6238(93)90020-8" @default.
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