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A comparison of insulin receptors in the developing fetal lung in normal and in streptozotocin-induced diabetic pregnancies.

Insulin receptors from fetal rat lungs of normal and streptozotocin-induced diabetic pregnancies were examined for their binding capacities and association constants. Sprague-Dawley rats, given a single dose of streptozotocin at 7 days' gestation, became hypoinsulinemic and hyperglycemic within 48 hours, although they remained healthy enough to carry fetuses to term. The fetuses of the streptozotocin-treated pregnancies had hyperglycemia (3,750 +/- 400 micrograms glucose/ml vs 390 +/- glucose/ml for control subjects), but were not hyperinsulinemic. Insulin receptor binding capacities of fetal lungs from control pregnancies increased as a function of gestational age from 16 to 21 days. Receptor binding capacities of lungs from streptozotocin-treated pregnancies also increased with gestational age until 21 days, when they dropped to 50% of control values. It was demonstrated in organ culture that fetal lung receptors from normal pregnancies of 20 days' gestation could be down-regulated in the presence of insulin and that this down-regulation is coupled to a biologic effect of insulin, hexose transport. It was concluded that fetal lung insulin receptors can be regulated by insulin concentrations in vitro and by experimental diabetic pregnancies in vivo.

Animals↗
PubMed1979

[Formation of the microcirculatory bed of the muscle coat of the wall of the sigmoid colon during human fetal development].

During intrauterine life microcirculatory bed of the muscular coat is forming and developing in accordance with its differentiation, growth and functional changes at various steps of its ontogenesis. This step-like differentiation in the parts composing the microcirculatory bed and the whole microcirculatory network of longitudinal and circulatory layers of the muscular coat is genetically connected with differentiation taking place in the wall of the sigmoid colon during the developmental period studied and, in the end, reflects morphological maturation of the sigmoid colon at different stages of its individual ontogenesis.

Colon, Sigmoid↗
PubMed1979

[Effect of halothane (narcothane) on intrauterine fetal development].

The authors examined the effect of chalotane (narcotann ne-Spofa) on the development of a rat fetus. The rats were divided into groups and were narcotised for a period of 4 hours as well as 4.5 days. One of the group was narcotised from the 8 to the 13 day of gestation. Narcosis was made in chambers with dynamic inhalatory regimen at concentration of narcotane of 10 mg/m3 and 250 mg/m3. There was blastopathogenic effect of narcotane, manifested by an early resorption of nidaded ova, by nonspecific action on the fetus, which inhibited growth and development of the fetus and raised the mortality of the fetuses. The amount of estriol was diminished in mothers, treated with 250 mg/m3 of the drug.

Alkaline Phosphatase↗