Presence and characteristics of epidermal growth factor receptors in human fetal small intestine and colon

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Abstract
In the present study, we demonstrate for the first time the presence of important concentrations of EGF binding sites in isolated epithelial cells of both human fetal small intestine and colon as early as 12 weeks gestation. The pattern of EGF binding in the small intestine between 12 and 17 weeks show that binding was significantly higher (2.5-fold) in younger fetuses than in older fetuses. Moreover, the fetal colon exhibited a much higher binding capacity (1.5-2.5 times) than corresponding intestinal cells for all age groups studied. Analysis of Scatchard representations reveal that the concentration of high- and low-affinity binding sites in colonic epithelial cells are twice the values observed in corresponding intestinal cells. The present data raise interesting possibilities as to the role of this growth factor in human fetal gut development.