Abstract
Human intestinal and gastric mesenchymal cells were associated with chick and rat intestinal endoderm in order to test their species-specific capacity on epithelial differentiation. Primary cell cultures were established from human intestinal and gastric mesenchyme. Animal intestinal endoderms were associated with both cell types, grafted in ovo and allowed to develop for 12 days. The morphologic and enzymatic differentiation of the recombinants demonstrated two types of inductive properties exerted by human fetal intestinal and gastric mesenchymal cells, respectively. Firstly, human intestinal mesenchymal cells triggered intrinsic developmental capacities in chick and rat endoderm, i.e. enhanced structural brush-border maturation in both species and precocious sucrase induction in rat endoderm. Secondly, human gastric mesenchymal cells provoked the partial conversion of chick intestinal endoderm into gastric structures. Such properties were not found in homologous animal mesenchymes.
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