Atrazine disorganises laminin formation and reduces cell numbers in the tammar testis during early differentiation

in Reproduction
Authors:
Yu Chen School of BioSciences, The University of Melbourne, Victoria, Australia

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Jaiden Lay School of BioSciences, The University of Melbourne, Victoria, Australia

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Geoffrey Shaw School of BioSciences, The University of Melbourne, Victoria, Australia

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Gerard A Tarulli School of BioSciences, The University of Melbourne, Victoria, Australia

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Marilyn B Renfree School of BioSciences, The University of Melbourne, Victoria, Australia

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Correspondence should be addressed to M B Renfree: m.renfree@unimelb.edu.au

*(G A Tarulli and M B Renfree contributed equally to this work and are joint senior authors)

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In brief

Atrazine, like oestrogen, disorganises laminin formation and reduces the number of germ cells and Sertoli cells in the developing testes of the tammar wallaby. This study suggests that interfering with the balance of androgen and oestrogen affects the integrity of laminin structure and testis differentiation.

Abstract

The herbicide atrazine was banned in Europe in 2003 due to its endocrine disrupting activity but remains widely used. The integrity of the laminin structure in fetal testis cords requires oestrogen signalling but overexposure to xenoestrogens in the adult can cause testicular dysgenesis. However, whether xenoestrogens affect laminin formation in developing testes has not been investigated. Here we examined the effects of atrazine in the marsupial tammar wallaby during early development and compare it with the effects of the anti-androgen flutamide, oestrogen, and the oestrogen degrader fulvestrant. The tammar, like all marsupials, gives birth to altricial young, allowing direct treatment of the developing young during the male programming window (day 20–40 post partum (pp)). Male pouch young were treated orally with atrazine (5 mg/kg), flutamide (10 mg/kg), 17β-oestradiol (2.5 mg/kg) and fulvestrant (1 mg/kg) daily from day 20 to 40 pp. Distribution of laminin, vimentin, SOX9 and DDX4, cell proliferation and mRNA expression of SRY, SOX9, AMH, and SF1 were examined in testes at day 50 post partum after the treatment. Direct exposure to atrazine, flutamide, 17β-oestradiol, and fulvestrant all disorganised laminin but had no effect on vimentin distribution in testes. Atrazine reduced the number of germ cells and Sertoli cells when examined at day 40–50 pp and day 20 to 40 pp, respectively. Both flutamide and fulvestrant reduced the number of germ cells and Sertoli cells. Atrazine also downregulated SRY expression and impaired SOX9 nuclear translocation. Our results demonstrate that atrazine can compromise normal testicular differentiation during the critical male programming window.

 

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