In vitro analysis of esophageal atresia using a whole-embryo culture system.

BACKGROUND/PURPOSE: Administration of Adriamycin to pregnant rats leads to the development of esophageal atresia with tracheo-esophageal fistula. This defect arises from failure of the trachea to develop normally from the primitive foregut; instead,the upper foregut differentiates into trachea, then continues to the lower esophageal segment as a tracheo-esophageal fistula. Our aim was to explore the possibility of growing Adriamycin-exposed embryos using a whole-embryo culture technique and to determine whether or not esophageal atresia with tracheo-esophageal fistula could be prevented in an Adriamycin-treated rat model.

METHODS

Rat embryos were exposed to Adriamycin in utero on days 6 - 9 of gestation, removed on day 10 and grown in vitro as described by New (11) for 48 hours using 100% serum from animals not exposed to Adriamycin.

RESULTS

Thirty Adriamycin-exposed embryos were grown in vitro using normal serum. Histologic assessment of tracheo-esophageal development showed that 14 embryos had normal development, while 16 developed esophageal atresia.

CONCLUSIONS

Growth of Adriamycin-exposed embryos was successful using "whole-embryo culture technique"; abnormal tracheo-esophageal development could in some cases be altered by removing the embryos at day 10 and exposing them to normal serum for 48 hours.