Experimental Physiology
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Quarterly Journal of Experimental Physiology 73.6 pp 1013-1016
© The Physiological Society 1988
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A NEW FORM OF ASYMMETRY IN EPITHELIA: KINETICS OF APICAL AND BASAL SULPHATE TRANSPORT IN HUMAN PLACENTA

J. C. Bustamante 1, D. L. Yudilevich 1, and C. A. R. Boyd 2

1 Department of Physiology, King's College London, Camden Hill Road, London W8 7AH
2 Department of Human Anatomy, South Parks Road, Oxford OX1 3QX

Sulphate transport into and out of membrane vesicles prepared from both the brush-border and basal surfaces of the human placental trophoblast has been studied. For both surfaces of this epithelium clear evidence of trans-stimulation of influx is seen but for efflux, acceleration of labelled sulphate movement by addition of external sulphate is seen only in basal and not in brush-border membrane vesicles. This kinetic asymmetry may underlie the previously observed, but unexplained, finding that the concentration of sulphate is greater in the fetal than in the maternal circulation.

Submitted on August 17, 1988
Accepted on August 26, 1988




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