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Epithelial regulation of prolactin effect on amnionic permeability.
American Journal of Obstetrics and Gynecology
|January 1, 1986
Summary
Prolactin significantly reduces human amnion permeability to water, primarily acting on the fetal-facing epithelium. This action is likely receptor-mediated, though direct evidence remains elusive.
Area of Science:
- Reproductive Biology
- Membrane Physiology
- Endocrinology
Background:
- Human amnion permeability to water is crucial for fetal development.
- Prolactin, a key hormone, is known to influence various physiological processes.
- Previous studies suggest prolactin affects amnion permeability, potentially via its epithelial lining.
Purpose of the Study:
- To confirm the epithelial site of prolactin action on amnionic membrane permeability.
- To investigate a potential receptor-mediated mechanism for prolactin's effect.
- To elucidate the role of amniotic epithelium in regulating water transport.
Main Methods:
- Assessing tritiated water permeability in intact and enzymatically stripped amnionic membranes.
- Utilizing radioautography to localize iodine 125-labeled prolactin.
- Conducting competition experiments to explore receptor binding.
Main Results:
- Ovine prolactin decreased water permeability only in intact amnionic membranes.
- Epithelial cell stripping did not alter baseline membrane permeability to water.
- Iodine 125-labeled prolactin localized to amniotic epithelium's light cells, but receptor-mediated action was not definitively proven.
Conclusions:
- Prolactin influences human amnion water permeability, with the effect localized to the epithelial cells on the fetal surface.
- The findings suggest a significant role for amniotic epithelium in mediating prolactin's effects on membrane transport.
- While prolactin binding to epithelial cells was observed, a definitive receptor-mediated mechanism requires further investigation.