ISG15 expression profile in peripheral blood during the maternal recognitionof pregnancy in cattle
| Autor: | Machado, Fabrício Amadori |
|---|---|
| Přispěvatelé: | Antoniazzi, Alfredo Quites, Mesquita, Fernando Silveira, Sudano, Mateus José |
| Jazyk: | portugalština |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Biblioteca Digital de Teses e Dissertações do UFSM Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
| Popis: | The maternal recognition of pregnancy (MRP) in ruminants is a complex event, involving several cellular mechanisms. It is at that moment that the highest embryonic mortality occurs in cattle. The MRP period is characterized by the secretion of interferon tau (IFNT) by the embryo. IFNT is produced and secreted by the trofloblast cells of the embryo, with greater intensity at 18 days of pregnancy. The main function of this protein is to keep the corpus luteum fully active, avoiding luteolysis. Direct action of IFNT on extrauterine tissues raises the expression of interferon-stimulated genes (ISGs). Among the ISGs stimulated by IFNT, the gene stimulated by interferon 15 (ISG15) stands out. Studies have demonstrated endocrine action of IFNT. An elevation in ISG expression levels in blood and luteal cells was observed shortly after signaling by IFNT at the start of gestation in ruminants. Peripheral blood polymorphonuclear cells (PMN) are more sensitive to the IFNT stimulus compared to peripheral blood mononuclear cells (PBMCs). The objectives of this study are: (1) to determine the earliest possible time to identify ISG15 expression in pregnant heifers; (2) establish the cell fraction to determine the early diagnosis of pregnancy with high accuracy in cut heifers; (3) demonstrate the expression profile of ISG15 on days 16 and 18 after artificial insemination (AI). Synchronization of the estrous cycle was performed in 28 heifers. The pregnancy diagnosis was performed on days 29 and 60 after AI and resulted in 10 pregnant heifers, 14 non-pregnant heifers, and 4 non-inseminated heifers (negative control group). Blood was collected from the coccygeal vein after AI (Days 16 and 18). Cellular fractions of PBMC and PMN were collected and stored at -80 ° C until further extraction of RNA, cDNA and qPCR, respectively. The relative expression of ISG15 differed between the PMN and PBMC cell fraction of pregnant heifers (p |
| Databáze: | OpenAIRE |
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