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• W2039841063 abstract "A symposium was held at the 41st annual meeting of the Society of Toxicology with presentations that emphasized novel molecular and cellular pathways that modulate the response to testicular toxicants. The first two presentations described cellular alterations after exposure to the Sertoli cell toxicant, mono-(2-ethylhexyl) phthalate (MEHP). The expression of flamingo1, a G protei coupled receptor family member that may couple cell-cell adhesion to G protein-dependent signaling in Sertoli cells, was rapidly altered after MEHP exposure. Sertoli cell associated flamingo1 immunostaining was redistributed early (within 2 h) after MEHP exposure and disappeared by 12 h, suggesting that flamingo1 is a proximal phthalate target. MEHP was also described to alter the expression and activity of the newly identified death receptors DR4, 5 and 6 in the testis. The differential cellular changes in the levels of DR4, 5 and 6 after phthalate exposure suggested that they may act as surrogates or in concert with the widely described Fas-signaling pathway in the initiation of germ cell apoptosis after MEHP exposure. The next two presentations focused on revealing mechanisms that may explain the persistent post-exposure testicular atrophy that is observed in rodents after a variety of chemical or physical insults (radiation, chemotherapeutics, toxicants) and possible strategies to re-initiate spermatogenesis in the atrophic testis. Hormonal manipulations that lower testosterone and serum FSH levels allow for re-initiation of spermatogonial development. Recent investigation of additional models of persistent atrophy such as mutant mice, the aged Brown Norway rat, EDS-induced Leydig cell deficient rat, and primates, have broadened insight into the mechanisms responsible for persistent atrophy. The last presentation described the use of cDNA arrays in the investigation of cellular elements and mechanisms responsible for disruption of spermatogenesis by the drinking water disinfectant bromochloroacetic acid (BCA). A custom mouse testis cDNA array interrogating 950 genes was used for analysis of testis mRNA. BCA altered the expression of 53 of the 950 genes, including two encoding sperm proteins known to be significant for male fertility, and other genes involved in spermatogenesis, stress response, and cell communication/adhesion. These observations strengthen the hypothesis that BCA disrupts spermatogenesis by altering the process of spermiogenesis." @default.
• W2039841063 created "2016-06-24" @default.
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• W2039841063 date "2002-10-01" @default.
• W2039841063 modified "2023-10-14" @default.
• W2039841063 title "Defining the cellular and molecular mechanisms of toxicant action in the testis" @default.
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• W2039841063 doi "https://doi.org/10.1016/s0378-4274(02)00254-0" @default.
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