Investigations into the role of platelet-activating factor in the peri-conception period of the mare

in Reproduction
Authors:
Edwina F Lawson Priority Research Centre for Reproductive Science, The University of Newcastle, Callaghan, New South Wales, Australia

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Arnab Ghosh School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, New South Wales, Australia
Centre for Drug Repurposing and Medicines Research Program, Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia

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Christopher Grupen Sydney School of Veterinary Science, Faculty of Science, The University of Sydney, Camden, New South Wales, Australia

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Jacob Netherton Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia.

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Robert John Aitken Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia.

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Nathan Druery Smith Analytical & Biomolecular Research Facility, University of Newcastle, Callaghan, New South Wales, Australia.

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Rebecca Lim Priority Research Centre for Brain and Mental Health University of Newcastle, Callaghan, New South Wales, Australia.

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Hannah R Drury School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, New South Wales, Australia.

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Russell Pickford Bioanalytical Mass Spectrometry Facility, University of New South Wales, Kensington, New South Wales, Australia.

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Zamira Gibb Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia.

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Mark Baker Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia.

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Pradeep Singh Tanwar Global Centre for Gynaecological Diseases, University of Newcastle, Callaghan, New South Wales, Australia

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Aleona Swegen Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia.

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Correspondence should be addressed to A Swegen: aleona.swegen@newcastle.edu.au
DOI:
https://doi.org/10.1530/REP-24-0049
Volume/Issue:
Volume 168: Issue 4
Article ID:
e240049
Article Type:
Research Article
Online Publication Date:
27 Aug 2024
Copyright:
© the author(s) 2024
Restricted access
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In Brief

In many mammals, the lipid platelet-activating factor (PAF) has important functions in female reproduction and fertility. This study shows that PAF is present in the reproductive tissues of mares and is involved in processes related to ovulation and early pregnancy.

Abstract

Platelet-activating factor (PAF) has been implicated in a number of reproductive processes ranging from ovulation to embryo motility but has not been widely explored in the mare. To identify the presence and examine the role of PAF in the equine periconception processes, targeted mass spectrometry coupled with chromatographic separation was performed on equine follicular fluid (FF), and PAF was quantitatively detected. Subsequently, untargeted high-resolution mass spectrometry-based lipidomic analysis was carried out to quantify PAF in different-sized pre-ovulatory follicles, whereby different molecular species of PAF, PAF (14:0) and PAF (16:1), were both seen to be increasing with follicle diameter. These findings suggest that PAF within FF is increasing as preovulatory follicles approach ovulation. Additionally, immunofluorescence staining identified the PAF receptor in the luminal pericellular, apical, and basal aspect of equine oviductal epithelial cells. Lastly, an equine oviductal epithelial organoid model was generated and showed that the addition of PAF significantly increased the ciliary beat frequency (CBF) (Hz), an action consistent with a role for PAF in embryo migration. It is proposed that the local action of PAF on the ciliated cells of the oviduct propels both the oocyte and the conceptus towards the uterus. In the mare, it appears that PAF is a contributor during the periconception period, potentially being a mediator in the mechanisms of ovulation and in the dialogue of very early pregnancy.

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Print ISSN:
1470-1626
Online ISSN:
1741-7899

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