| Autor: |
Melo, G. D., Pinto, L. M. F., Rocha, C. C., Motta, I. G., Silva, L. A., da Silveira, J. C., Gonella-Diaza, A. M., Binelli, M., Pugliesi, G. |
| Předmět: |
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| Zdroj: |
Reproduction, Fertility & Development; 2020, Vol. 32 Issue 11, p953-966, 14p |
| Abstrakt: |
This study characterised the expression of interferon (IFN)-τ-stimulated genes (ISGs) and Type I IFN receptors in circulating polymorphonuclear cells (PMNs) of beef heifers and compared it with expression in peripheral blood mononuclear cells (PBMCs) up to Day 20 of gestation. Nelore heifers (n = 26) were subjected to fixed-time AI (FTAI) on Day 0. PMNs and PBMCs were isolated on Days 0, 10, 14, 16, 18 and 20 after FTAI. The abundance of target transcripts (ubiquitin-like protein (ISG15), 2′-5′-oligoadenylate synthetase 1 (OAS1), myxovirus resistance 1 (MX1), myxovirus resistance 2 (MX2), IFN receptor I (IFNAR1) and IFN receptor 2 (IFNAR2)) was determined using real-time quantitative polymerase chain reaction and compared between pregnant (n = 8) and non-pregnant (n = 9) females. In both PBMCs and PMNs, ISG15 and OAS1 expression was greater in pregnant than non-pregnant heifers on Days 18 and 20. There were no significant differences in the expression of ISGs between PBMCs and PMNs. A time effect on expression was found for IFNAR1 in PBMCs and IFNAR2 in PMNs, with decreased expression of both genes on Days 18 and 20. When the expression of these genes was compared between cell types only in pregnant heifers, IFNAR2 expression in PMNs had an earlier decrease when compared to its expression in PBMCs, starting from Day 18. In conclusion, PMNs do not respond earlier to the conceptus stimulus, and ISG15 and OAS1 expression in both PMNs and PBMCs can be used as a suitable marker for pregnancy diagnosis on Days 18 and 20. In addition, gestational status did not affect IFNAR1 and IFNAR2 expression, but IFNAR2 showed a distinct response between PMNs and PBMCs of pregnant heifers. Early pregnancy diagnosis in cattle operations allows non-pregnant females to be rapidly detected, allowing new chances of conception in a shorter period. To develop a method to diagnose pregnancy earlier, it is necessary to understand the stimulatory effects of the conceptus on the maternal organism. In this study we found that both circulating peripheral blood mononuclear cells and polymorphonuclear leucocytes respond to the presence of the bovine conceptus by increasing expression of interferon-τ-stimulated genes up to 10 days before pregnancy can be detected when using conventional methods. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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