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Nucleoside Phosphatases in Human Amnion: Ultrastructural Localization

Deposition of nucleoside phosphatases was detected by electron microscopic localization at the lateral plasma membranes separating amnionic epithelial cells. To a much smaller extent, reaction products were deposited on the microvillous borders of the free surfaces. Since amnionic epithelium does not necessarily participate in extensive active transport, nucleoside phosphatases in that tissue may be related primarily to intracellular metabolism. Although ultrastructurally similar cells in other tissues that are known to transport actively have abundant nucleoside phosphatases at their plasma membranes, the localization of these enzymes at equivalent sites in the human amnion does not necessarily imply active fetomaternal transport. Ultracytochemical demonstration of nucleoside phosphatase in a membrane should, therefore, not always be equated with active transport by that tissue.