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Explants of Intact Endometrium to Model Bovine Innate Immunity and Inflammation Ex Vivo

Authors

  • Álan Maia Borges,

    1. College of Medicine, Institute of Life Science, Swansea University, Swansea, UK
    2. Departamento de Clínica e Cirurgia Veterinárias, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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  • Gareth David Healey,

    1. College of Medicine, Institute of Life Science, Swansea University, Swansea, UK
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  • Iain Martin Sheldon

    Corresponding author
    • College of Medicine, Institute of Life Science, Swansea University, Swansea, UK
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Correspondence

Prof Martin Sheldon

Institute of Life Science, College of Medicine, Swansea University, Singleton Park, Swansea SA2 8PP, UK.

E-mail: i.m.sheldon@swansea.ac.uk

Abstract

Problem

Bacterial infections commonly cause bovine endometritis and infertility via innate immune pathways. However, mechanistic studies using isolated cells or chopped tissue may be compromised by the disruption of endometrial architecture and release of damage-associated molecular patterns. So, this study aimed to establish an ex vivo model of intact bovine endometrium to study innate immunity and inflammation.

Method of study

Intact bovine endometrium explants were collected using a sterile 8-mm punch biopsy and cultured ex vivo with bacteria or pathogen-associated molecules. Interleukin accumulation was measured, and tissue viability was assessed by microscopy, TdT-mediated biotin–dUTP nick-end labelling and lactate dehydrogenase assay.

Results

Intact endometrium explants accumulated IL-6, IL-1β and IL-8 in response to Gram-negative or Gram-positive bacteria, and their purified pathogen-associated molecules; inflammatory responses were dependent on the stage of oestrous cycle. Explants of intact endometrium maintained viability and tissue architecture, and had lower basal accumulation of interleukins compared with explants using chopped endometrium.

Conclusion

This study established a tractable ex vivo model of intact endometrium to explore the mechanisms of immunity and inflammation in the bovine endometrium.

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