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Exposure to atrazine and endosulfan alters oviductal adenogenesis in the broad-snouted caiman (Caiman latirostris)

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Abstract

The molecular pathways involved in oviductal adenogenesis are highly conserved among vertebrates. In this work, we study the histomorphological changes and molecular pathways involved in Caiman latirostris oviductal adenogenesis and the effects of in ovo exposure to environmentally relevant doses of endosulfan (END) and atrazine (ATZ) on these processes. To this end, the histomorphological changes at epithelial and subepithelial compartments, the protein expressions of β-catenin and Wnt-7a, and the gene expression of metalloproteinases (MMPs) and its inhibitors (TIMPs) were evaluated as biomarkers of oviductal adenogenesis in prepubertal juvenile C. latirostris. Exposure to END altered adenogenesis-related epithelium characteristics and mRNA expression of MMP2, MMP9, and TIMP1. Exposure to ATZ increased the width of the subepithelial stroma with loosely arranged collagen fibers and increased β-catenin expression in buds (invaginated structures that precede glands). The results demonstrate that in ovo exposure to ATZ and END alters oviductal adenogenesis at tissue, cellular, and molecular levels. An altered oviductal adenogenesis could impair fertility, raising concern on the effects of pesticide pollution in wildlife and domestic animals.

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Availability of data and materials

The datasets compiled and analyzed in the present study are available from the corresponding author on reasonable request.

Abbreviations

ANOVA:

Analysis of variance

ATZ:

Atrazine

EDC:

Endocrine-disrupting compounds

END:

Endosulfan

CTNNB1:

β-Catenin encoding gene

E2:

17β-Estradiol

FoxA2:

Forkhead box protein A2

IHC:

Immunohistochemistry

MMP2:

Matrix metalloproteinase 2

MMP7:

Matrix metalloproteinase 7

MMP9:

Matrix metalloproteinase 9

PAS:

Periodic acid Schiff

PBS:

Phosphate-buffered saline

TIMP1:

Tissue inhibitor of metalloproteinases 1

TIMP2:

Tissue inhibitor of metalloproteinases 2

Wnt:

Wingless-related integration site

Wnt-5a:

Wingless-related integration site family member 5a

Wnt-7a:

Wingless-related integration site family member 7a

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Acknowledgements

We thank Juan Grant and Walter Nykolajczuk for technical assistance and animal care. Field work was done in collaboration with ‘‘Reserva Natural El Cachapé,” Chaco, Argentina. YT is a doctoral fellow and RA is a post-doctoral fellow of CONICET, MVT is an assistant professional of the supporting research career and EHL is a career investigator of CONICET.

Funding

This study was supported by grants from the Argentine National Agency for the Promotion of Science and Technology (ANPCyT; PICT2016-0656), the Universidad Nacional del Litoral (CAI + D Program, 1–15, 2016), and the National Scientific and Technical Research Council of Argentina (CONICET; PIP2021-2023 Cod. 1220200101387CO).

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation and data collection and analysis were performed by Yamil Ezequiel Tavalieri. The first draft of the manuscript was written by Yamil Ezequiel Tavalieri and Ramiro Alarcón, and all the authors commented on previous versions of the manuscript. Yamil Ezequiel Tavalieri and Ramiro Alarcón contributed with visualization as well. María Virginia Tschopp and Germán Hugo Galoppo supplied methodological support. The review and edition of the final manuscript were performed by Enrique Hugo Luque, Mónica Muñoz-de-Toro, and Germán Hugo Galoppo. Enrique Hugo Luque and Mónica Muñoz-de-Toro contributed with funding acquisition. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Germán Galoppo.

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Ethical approval

The protocols used in this work were previously authorized by the Institutional Committee of Bioethics in Animal Care and Use of the Universidad Nacional del Litoral, Santa Fe, Argentina. All procedures and techniques used for egg collection, embryo handling, and sampling were performed according to the guidelines of the American Society of Ichthyologists and Herpetologists (ASIH, 2004). All animal experiments were carried out in accordance with the Guide for the Care and Use of Laboratory Animals of the National Research Council (USA) (IPCS, 2002).

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All authors agreed with the content of the present work, and all gave explicit consent to participate and submit the present manuscript. All the authors obtained consent from the responsible authorities at the institute/organization where the work has been carried out, before the work is submitted.

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All the authors accept responsibility for the content of the present manuscript and agreed to publish in Environmental Science and Pollution Research.

Competing interests

The authors declare no competing interests.

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Tavalieri, Y., Alarcón, R., Tschopp, M. et al. Exposure to atrazine and endosulfan alters oviductal adenogenesis in the broad-snouted caiman (Caiman latirostris). Environ Sci Pollut Res 31, 35927–35937 (2024). https://doi.org/10.1007/s11356-024-33662-7

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  • DOI: https://doi.org/10.1007/s11356-024-33662-7

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