Effect of cytokines and ovarian steroids on equine endometrial function: an in vitro study
A. Galvão A B , L. Valente A , D. J. Skarzynski B , A. Szóstek B , K. Piotrowska-Tomala B , M. R. Rebordão A , L. Mateus A and G. Ferreira-Dias A C
+ Author Affiliations
- Author Affiliations
A Centro de Investigação Interdisciplinar em Sanidade Animal, Avenida da Universidade Técnica, Polo Universitário, Alto da Ajuda, 1300-477, Lisboa, Portugal.
B Institute of Animal Reproduction and Food Research of Polish Academy of Science, ul. Bydgoska 7, 10-243 Olsztyn, Poland.
C Corresponding author. Email: gmlfdias@fmv.utl.pt
Reproduction, Fertility and Development 25(7) 985-997 https://doi.org/10.1071/RD12153
Submitted: 15 May 2012 Accepted: 5 September 2012 Published: 18 October 2012
Abstract
Regulation of immune–endocrine interactions in the equine endometrium is not fully understood. The aims of the present study were to: (1) investigate the presence of tumour necrosis factor alpha (TNF), interferon gamma (IFNG), Fas ligand (FASLG) and their receptors in the mare endometrium throughout the oestrous cycle; and (2) assess endometrial secretory function (prostaglandins), angiogenic activity and cell viability in response to TNF, oestradiol (E2), progesterone (P4) and oxytocin (OXT). Transcription of TNF and FASLG mRNA increased during the early and late luteal phase (LP), whereas IFNG mRNA increased in late LP. Transcription of the mRNA of both TNF receptors was highest in the mid-LP. All cytokines and receptors were expressed in surface and glandular epithelium, as well as in the stroma. Expression of TNF and its receptor TNFRSF1A increased during the follicular phase (FP) and mid-LP. IFNG was expressed in the mid-LP, whereas its receptor IFNR1 was expressed in the in mid- and late LP. The highest expression of FASLG and FAS occurred during the late LP. OXT increased the secretion of prostaglandin (PG) E2 and PGF2α in the FP and mid-LP. In the mid-LP, E2 and P4+E2 stimulated PGF2α secretion, whereas TNF and P4 increased cell viability. All treatments, with the exception of P4, increased nitric oxide and angiogenic activity in both phases. The coordinated action of cytokines and ovarian hormones may regulate secretory, angiogenic and proliferative functions in the equine endometrium.
Additional keywords : angiogenesis, endometrium, nitric oxide, prostaglandins.
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