A critical role of follicle-stimulating hormone (Fsh) in mediating the effect of clotrimazole on testicular steroidogenesis in adult zebrafish

Toxicology
Damien BaudiffierFrançois Brion

Abstract

Clotrimazole is a pharmaceutical fungicide known to inhibit several cytochrome P450 enzyme activities, including several steroidogenic enzymes. This study aimed to assess short-term in vivo effects of clotrimazole exposure on blood 11-ketotestosterone (11-KT) levels and on the transcriptional activity of genes in pituitary and testis tissue that are functionally relevant for androgen production with the view to further characterize the mode of action of clotrimazole on the hypothalamus-pituitary-gonad axis in zebrafish, a model vertebrate in toxicology. Adult male zebrafish were exposed to measured concentrations in water of 71, 159 and 258μg/L of clotrimazole for 7 days. Expression of pituitary gonadotropins β subunit (lhb, fshb), testicular gonadotropins receptors (lhcgr, fshr) and testicular steroidogenesis-related genes (e.g., star, cyp17a1, cyp11c1) were assessed. Blood concentrations of 11-KT were measured. Short-term exposure to clotrimazole induced a concentration-dependent increase of star, cyp17a1, and cyp11c1 gene expression and Cyp17a1 and Cy11c1 protein synthesis in Leydig cells, but androgen levels in blood remained unchanged. fshb, but not lhb mRNA levels in the pituitary tended to increase in clotrimazole-expose...Continue Reading

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