125I-human epidermal growth factor specific binding to placentas and fetal membranes from various pregnancy states

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Abstract
Specific binding of 125I-human epidermal growth factor (hEGF) to homogenates of term human placentas and fetal membranes from normal and appropriate for gestational age (N = 20), intrauterine growth retarded (N = 9), twin (N = 11), White class A/B diabetic (N = 12), and large for gestational age (N = 13) pregnancies was measured. In all pregnancy states, placentas bound approximately four times more 125I-hEGF than did fetal membranes (P < 0.001). There was no significant difference in 125I-hEGF binding to fetal membranes from the various pregnancy states (P > 0.05). 125I-hEGF specific binding to placentas from intrauterine growth retarded or twin pregnancies was significantly greater compared with placentas from normal and appropriate for gestational age pregnancies (P < 0.05). The binding to placentas from pregnancies complicated by White class A/B diabetes or large for gestational age infants, on the other hand, was not significantly different from that to placentas from normal and appropriate for gestational age pregnancies. 125I-hEGF specific binding did not differ between placentas from intrauterine growth retarded or twin pregnancies (P > 0.05). Placental and fetal membrane 125I-hEGF binding did not vary with fetal sex, maternal race, placental weight, or gestational age between 37 to 42 weeks (P > 0.05). Placental but not fetal membrane 125I-hEGF binding increased with increasing infant weight when appropriate for gestational age and large for gestational age infants were included (P < 0.05, r = 0.38, N = 32) but not for intrauterine growth retarded, appropriate for gestational age, or large for gestational age infants alone.

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