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Am J Physiol 207: 500-502, 1964;
0002-9513/64 $5.00
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Comparison of permeability of different layers of the primate placenta to d-arabinose and urea

Frederick C. Battaglia 1, Paul D. Bruns 1, Richard E. Behrman 1, A. Elmore Seeds 1, and Andre E. Hellegers 1

1 Laboratory of Perinatal Physiology, National Institute of Neurological Diseases and Blindness, National Institutes of Health, San Juan, Puerto Rico

The permeability of the amnion, chorion, and chorioamnion of the rhesus monkey placenta to urea and to d-arabinose has been studied in vitro. The chorion and chorioamnion were found to be less permeable per unit area than the amnion. No change in permeability with gestational age was found in each of the three tissue layers. Comparison with permeability data for the human chorion laeve revealed the permeability of the rhesus chorion to be similar in magnitude. All three tissue layers studied were more permeable to urea than to d-arabinose.

Key Words: placental d-arabinose-to-urea ratios • permeability of chorion versus amnion • resistivity of primate placenta • urea transfer across monkey placenta • d-arabinose transfer across monkey placenta

Submitted on October 15, 1963




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