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- W2035498053 abstract "In cloned pregnancies, placental deficiencies, including increased placentome size, reduced placentome number, and increased accumulation of allantoic fluid, have been associated with low cloning efficiency. To assess differences in paracrine and endocrine growth regulation in cloned versus normal bovine placentomes and pregnancies, we have examined the expression of insulin-like growth factor (IGF)-I and -II and their binding proteins (IGFBP)-1 through -3 in placentomes of artificially inseminated (AI), in vitro-produced (IVP), and nuclear transfer (NT) pregnancies at Days 50, 100, and 150 of gestation. Fetal, maternal, and binucleate cell counts in representative placentomes were performed on Days 50–150 of gestation in all three groups. Increased numbers of fetal, maternal, and binucleate cells were present in NT placentomes at all stages of gestation examined. Immunolocalization studies showed that spatial and temporal patterns of expression of IGFBP-2 and -3 were markedly altered in the placentomes of NT pregnancies compared to AI/IVP controls. Concentrations of IGF-I in fetal plasma, as determined by RIA, were significantly higher (P = 0.001) in NT pregnancies (mean ± SEM, 30.3 ± 2.3 ng/ml) compared with AI (19.1 ± 5.5 ng/ml) or IVP (24.2 ± 2.5 ng/ml) pregnancies on Day 150 of gestation. Allantoic fluid levels of IGFBP-1 were also increased in NT pregnancies. These findings suggest that endocrine and paracrine perturbations of the IGF axis may modulate placental dysfunction in NT pregnancies. Furthermore, increased cell numbers in NT placentomes likely have significant implications for fetomaternal communication and may contribute to the placental overgrowth observed in the NT placentomes." @default.
- W2035498053 created "2016-06-24" @default.
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- W2035498053 date "2004-02-01" @default.
- W2035498053 modified "2023-09-27" @default.
- W2035498053 title "Insulin-Like Growth Factor-I and Binding Proteins 1, 2, and 3 in Bovine Nuclear Transfer Pregnancies1" @default.
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- W2035498053 doi "https://doi.org/10.1095/biolreprod.103.021139" @default.
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