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Cyclooxygenase-2-derived endogenous prostacyclin enhances mouse embryo hatching
Jaou-Chen Huang1, W-S Alfred Wun, Jennifer S Goldsby
1Department of Obstetrics and Gynecology, University of Texas Health Science Center-Houston, Houston, TX 77030, USA. Jaou-Chen.Huang@uth.tmc.edu
Human Reproduction (Oxford, England)
|October 19, 2004
Summary
Mouse embryos synthesize prostaglandins (PGs), crucial for hatching. Blocking cyclooxygenase-2 (COX-2) inhibits hatching, highlighting PGI2
Area of Science:
- Reproductive Biology
- Embryology
- Biochemistry
Background:
- The role of prostaglandins (PGs) in embryo hatching is debated.
- Direct evidence for PG synthesis by mouse embryos is lacking.
Purpose of the Study:
- To investigate the role of endogenous prostaglandins in mouse embryo hatching.
- To identify the specific cyclooxygenase (COX) enzymes involved in PG synthesis.
- To determine the expression and localization of key enzymes in PG synthesis pathways.
Main Methods:
- Inhibition of endogenous PG synthesis using indomethacin and selective COX inhibitors.
- Analysis of eicosanoid profiles in blastocysts incubated with radiolabeled arachidonic acid.
- Western blot and immunohistochemistry to examine the expression and localization of COX-1, COX-2, and prostacyclin synthase (PGIS).
Main Results:
- Indomethacin and a selective COX-2 inhibitor significantly blocked embryo hatching.
- Addition of a prostacyclin analogue (iloprost) reversed the inhibitory effects.
- Mouse blastocysts primarily produced prostacyclin (PGI2) and expressed COX-1, COX-2, and PGIS from the 4-cell stage onwards.
Conclusions:
- Mouse embryos express the enzymes necessary for prostacyclin (PGI2) synthesis.
- COX-2-derived PGI2 plays a critical role in facilitating mouse embryo hatching.