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Fine structure of human amniotic epithelium following short-term preservation in vitro.

In 1965 Thomas described two distinct types of cell in the human amniotic epithelium and more recently Armstrong, Wilt & Pritchard (1968) have reported the presence ofup to four morphological variants in this epithelium at term. The material used in both of these studies was taken from placentae which had been stored in Hanks's solution for up to an hour before processing and, although Wilt, Miller & Ruiter (1964) found that preservation of the membranes in this solution produces no significant alteration in the light microscopical appearance of the epithelium, similar variations in the morphology of the cells have not been reported in many of the other ultrastructural investigations of the mature amnion. While, therefore, the work of Thomas (1965) and Armstrong et al. (1968) indicates that the cells are capable of a high degree of structural lability, it appears that at least some of their findings may have been due to alterations in the structure of the cells during the period when the amnion was stored in Hanks's solution. The extent to which the fine structure of the cells may be modified by preservation of the amnion in this solution has now been subjected to further investigation. In addition, since the occurrence of significant changes in their structure under such conditions may be of relevance to the evaluation of the findings of in vitro studies on the transport of small ions across the epithelium, the changes produced by Hanks's solution have been compared with those seen in material stored in some of the other media used in recent in vitro studies of fluid transport across the epithelium, and also with those produced by normal saline and human Ringer-lactate.