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Jansson, T.; Powell, T.L.
Placenta (Eastbourne), 04/2006, Letnik: 27Journal Article
Intrauterine growth restriction is associated with a range of alterations in placental transport functions: the activity of a number of transporters is reduced (Systems A, L and Tau, transporters for cationic amino acids, the sodium-proton exchanger and the sodium pump), placental glucose transporter activity and expression are unchanged whereas the activity of the calcium pump is increased. In contrast, accelerated fetal growth in association to diabetes is characterized by increased activity of placental Systems A and L and glucose transporters. Evidence suggests that these placental transport alterations are the result of specific regulation and that they, at least in part, contribute to the development of pathological fetal growth rather than representing a consequence to altered fetal growth. One interpretation of this data is that the placenta functions as a nutrient sensor, altering placental transport functions according to the ability of the maternal supply line to provide nutrients. Placental transporters are subjected to regulation by hormones. Insulin up-regulates several key placental transporters and maternal insulin may represent a “good nutrition” signal to increase placental nutrient transfer and the growth of the fetus. Preliminary evidence suggests that placental mammalian target of rapamycin, a protein kinase regulating protein translation and transcription in response to nutrient stimuli, may be involved in placental nutrient sensing.
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