Unidirectional transport across cultured ovine amniotic epithelial cell monolayer

Area of Science:

• Reproductive biology
• Cell biology
• Physiology

Background:

• Ovine amniotic cells are crucial for placental function.
• Understanding transcellular transport mechanisms is vital for reproductive physiology.

Purpose of the Study:

• To investigate unidirectional transport in ovine amniotic cells cultured as monolayers.
• To compare in vitro transport with in vivo pathways.

Main Methods:

• Cultured ovine amniotic cells to confluence on cell culture inserts.
• Measured (14)C-inulin permeability in two directions across the cell monolayer.
• Compared permeability with chorionic cells and umbilical vein endothelial cells.

Main Results:

• Ovine amniotic cells exhibited significantly higher permeability in one direction (0.69 ± 0.17 μl/min/cm²) compared to the reverse (0.11 ± 0.02 μl/min/cm²).
• The transport ratio of 6.2:1 for (14)C-inulin was observed.
• Vascular endothelial growth factor did not affect permeability.

Conclusions:

• Transcellular transport across ovine amniotic monolayers is directionally specific.
• The observed transport ratio aligns with in vivo ovine intramembranous pathway ratios.
• Findings suggest a combination of passive diffusion and directional vesicular transport.