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Uterine-conceptus interactions and reproductive failure in cattle
W W Thatcher1, A Guzeloglu, R Mattos
1Department of Animal Sciences, University of Florida, Gainesville 32610, USA.
Theriogenology
|January 5, 2002
Summary
Bovine interferon-tau (IFN-tau) inhibits prostaglandin F2alpha (PGF2alpha) secretion by regulating cyclooxygenase-2 (COX-2) gene expression via the JAK-STAT pathway, crucial for embryo survival and corpus luteum maintenance.
Area of Science:
- Reproductive biology
- Cell signaling
- Endocrinology
Background:
- Conceptus-endometrial dialogue is vital for corpus luteum (CL) maintenance and pregnancy establishment.
- Bovine interferon-tau (IFN-tau) is a key embryonic signal influencing luteolysis and pregnancy recognition.
- Prostaglandin F2alpha (PGF2alpha) secretion by the endometrium is a critical factor in CL regression.
Purpose of the Study:
- To elucidate the signal transduction pathways by which IFN-tau regulates cyclooxygenase-2 (COX-2) expression and PGF2alpha secretion in bovine endometrial cells.
- To investigate the role of the mitogen-activated protein kinase (MAPK) and Janus kinase (JAK)-signal transducer and activator of transcription (STAT) pathways in IFN-tau's effects.
- To explore maternal regulation of the antiluteolytic pathway involving eicosapentaenoic acid (EPA).
Main Methods:
- Primary bovine endometrial (BEND) cells were treated with phorbol 12, 13 dibutyrate (PDBu) to stimulate Protein Kinase C (PKC) and COX-2 expression.
- Cells were co-treated with IFN-tau to assess its modulatory effects on PGF2alpha secretion and signaling pathways.
- Western blotting and gene expression analysis were used to examine MAPK and JAK-STAT pathway activation.
Main Results:
- PDBu stimulation activated COX-2 gene expression and PGF2alpha secretion via the MAPK pathway.
- IFN-tau attenuated PDBu-induced PGF2alpha secretion, an effect independent of the MAPK pathway.
- IFN-tau activated the JAK-STAT pathway, leading to altered gene expression of COX-2 and reduced PGF2alpha secretion.
- Eicosapentaenoic acid (EPA) decreased endometrial PGF2alpha and progesterone secretion, promoting conceptus development and IFN-tau secretion.
Conclusions:
- IFN-tau inhibits PGF2alpha secretion by regulating COX-2 gene expression through the JAK-STAT pathway, independent of the MAPK pathway.
- This mechanism is crucial for preventing luteolysis and ensuring embryo survival in cattle.
- Maternal factors like EPA can modulate endometrial function to support pregnancy.