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Abstract Title:

Perinatal exposure to glyphosate and a glyphosate-based herbicide affect spermatogenesis in mice.

Abstract Source:

Toxicol Sci. 2019 Feb 20. Epub 2019 Feb 20. PMID: 30785197

Abstract Author(s):

Thu Ha Pham, Lohann Derian, Christine Kervarrec, Pierre-Yves Kernanec, Bernard Jégou, Fatima Smagulova, Aurore Gely-Pernot

Article Affiliation:

Thu Ha Pham

Abstract:

Glyphosate is the most widely used herbicide in the world. Several studies have investigated the effects of glyphosate and glyphosate-based-herbicides (GBHs) on male reproduction, but there is still little and conflicting evidence for its toxicity. In this study, we analyzed the effects of glyphosate, alone or in formula, on the male reproductive system. Pregnant mice were treated from E10.5 to 20 days postpartum (dpp) by adding glyphosate or a GBH (Roundup® 3 Plus) to their drinking water at 0.5 (the acceptable daily intake, ADI dose), 5 and 50 mg/kg/day. Male offspring derived from treated mice were sacrificed at 5, 20 and 35 days-old (d.o.) and 8 months-old (m.o.) for analysis. Our result showed that exposure to glyphosate, but not GBH, affect testis morphology in 20 d.o. and decrease serum testosterone concentrations in 35 d.o. males. We identified that the spermatozoa number decreased by 89% and 84% in 0.5 and 5 mg/kg/day of GBH and glyphosate groups, respectively. Moreover, the undifferentiated spermatogonia numbers were decreased by60% in 5 mg/kg/day glyphosate group, which could be due to the alterations in the expression of genes involved in germ cell differentiation such as Sall4 and Nano3 and apoptosis as Bax and Bcl2. In 8 m.o. animals, a decreased testosterone level was observed in GBH groups. Our data demonstrate thatglyphosate and GBHs could cause endocrine-disrupting effects on male reproduction at low doses. As glyphosate has effects at the ADI level, our data suggests that the current ADI for glyphosate could be overestimated.

Study Type : Animal Study

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