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Human embryonic origin early pregnancy factor before and after implantation
Summary
Early pregnancy factor (EPF) is crucial for maintaining the fetal allograft. Research shows EPF originates maternally before implantation and embryonically after implantation, linking fertilization to immunomodulation.
Area of Science:
- Reproductive immunology
- Embryology
- Maternal-fetal medicine
Background:
- Early pregnancy factor (EPF) plays a role in maintaining the fetal allograft in mammals.
- EPF acts as a link between fertilization and immunomodulation.
Purpose of the Study:
- To investigate the secretion and origin of EPF in the human conceptus before and after implantation.
- To determine if EPF is secreted by pre-implantation embryos.
Main Methods:
- Culturing isolated human trophoblastic cells (gestational weeks 7-9) and measuring EPF secretion using T11 monoclonal antibody.
- Analyzing EPF content in human embryonal extracts from various organs.
- Culturing 52 human pre-implantation embryos from in vitro fertilization/embryo transfer cycles for 36 hours and assessing EPF in the culture media.
Main Results:
- Significant EPF secretion was observed from isolated trophoblastic cells, peaking within the first 8 days of culture.
- Substantial EPF activity was detected in human embryonal extracts from the spinal cord, liver, and kidney.
- No significant EPF activity was found in the media of cultured pre-implantation embryos.
Conclusions:
- Pre-implantation EPF originates from maternal sources.
- Post-implantation EPF is of embryonal origin.
- These findings clarify the source of EPF during early human development and its role in immune tolerance.