Insulin action on the human placental endothelium in normal and diabetic pregnancy
The placental endothelium is unique among the entire human vasculature. The blood enriched in oxygen and nutrients is transported in the veins, whereas the arteries contain deoxygenated blood coming from the fetus. The placental vasculature has to develop rapidly to ensure adequate supply of the fet...
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| Vydané v: | Current vascular pharmacology Ročník 7; číslo 4; s. 460 |
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| Hlavní autori: | , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
United Arab Emirates
01.10.2009
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| ISSN: | 1875-6212, 1875-6212 |
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| Abstract | The placental endothelium is unique among the entire human vasculature. The blood enriched in oxygen and nutrients is transported in the veins, whereas the arteries contain deoxygenated blood coming from the fetus. The placental vasculature has to develop rapidly to ensure adequate supply of the fetus. Therefore, factors present in the fetal circulation will stimulate placental angiogenesis. In the third trimester of pregnancy the placental endothelium is richly endowed with insulin receptors. In a pregnancy complicated by maternal diabetes, fetal hyperinsulinemia resulting from maternal and, hence, fetal hyperglycaemia induces changes in the placental vasculature such as increased growth and angiogenesis. This review will discuss general effects of insulin on endothelial cells and further focus on insulin effects on the placental endothelium. Isolation and culture of placental endothelial cells has allowed the identification of insulin effects in vitro. These include metabolic effects of insulin i.e. stimulation of glycogen synthesis, and modulation of angiogenesis on the placental arterial endothelium i.e. regulation of ephrin-B2 expression, an arterial specific signalling molecule implicated in sprouting. The effect of insulin on ephrin-B2 in placental arterial endothelial cells as well as their particularly high expression levels of insulin receptors and receptors for vascular endothelial growth factors indicate that placental angiogenesis is likely to emanate from the arterial compartment and is stimulated by insulin. |
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| AbstractList | The placental endothelium is unique among the entire human vasculature. The blood enriched in oxygen and nutrients is transported in the veins, whereas the arteries contain deoxygenated blood coming from the fetus. The placental vasculature has to develop rapidly to ensure adequate supply of the fetus. Therefore, factors present in the fetal circulation will stimulate placental angiogenesis. In the third trimester of pregnancy the placental endothelium is richly endowed with insulin receptors. In a pregnancy complicated by maternal diabetes, fetal hyperinsulinemia resulting from maternal and, hence, fetal hyperglycaemia induces changes in the placental vasculature such as increased growth and angiogenesis. This review will discuss general effects of insulin on endothelial cells and further focus on insulin effects on the placental endothelium. Isolation and culture of placental endothelial cells has allowed the identification of insulin effects in vitro. These include metabolic effects of insulin i.e. stimulation of glycogen synthesis, and modulation of angiogenesis on the placental arterial endothelium i.e. regulation of ephrin-B2 expression, an arterial specific signalling molecule implicated in sprouting. The effect of insulin on ephrin-B2 in placental arterial endothelial cells as well as their particularly high expression levels of insulin receptors and receptors for vascular endothelial growth factors indicate that placental angiogenesis is likely to emanate from the arterial compartment and is stimulated by insulin. The placental endothelium is unique among the entire human vasculature. The blood enriched in oxygen and nutrients is transported in the veins, whereas the arteries contain deoxygenated blood coming from the fetus. The placental vasculature has to develop rapidly to ensure adequate supply of the fetus. Therefore, factors present in the fetal circulation will stimulate placental angiogenesis. In the third trimester of pregnancy the placental endothelium is richly endowed with insulin receptors. In a pregnancy complicated by maternal diabetes, fetal hyperinsulinemia resulting from maternal and, hence, fetal hyperglycaemia induces changes in the placental vasculature such as increased growth and angiogenesis. This review will discuss general effects of insulin on endothelial cells and further focus on insulin effects on the placental endothelium. Isolation and culture of placental endothelial cells has allowed the identification of insulin effects in vitro. These include metabolic effects of insulin i.e. stimulation of glycogen synthesis, and modulation of angiogenesis on the placental arterial endothelium i.e. regulation of ephrin-B2 expression, an arterial specific signalling molecule implicated in sprouting. The effect of insulin on ephrin-B2 in placental arterial endothelial cells as well as their particularly high expression levels of insulin receptors and receptors for vascular endothelial growth factors indicate that placental angiogenesis is likely to emanate from the arterial compartment and is stimulated by insulin.The placental endothelium is unique among the entire human vasculature. The blood enriched in oxygen and nutrients is transported in the veins, whereas the arteries contain deoxygenated blood coming from the fetus. The placental vasculature has to develop rapidly to ensure adequate supply of the fetus. Therefore, factors present in the fetal circulation will stimulate placental angiogenesis. In the third trimester of pregnancy the placental endothelium is richly endowed with insulin receptors. In a pregnancy complicated by maternal diabetes, fetal hyperinsulinemia resulting from maternal and, hence, fetal hyperglycaemia induces changes in the placental vasculature such as increased growth and angiogenesis. This review will discuss general effects of insulin on endothelial cells and further focus on insulin effects on the placental endothelium. Isolation and culture of placental endothelial cells has allowed the identification of insulin effects in vitro. These include metabolic effects of insulin i.e. stimulation of glycogen synthesis, and modulation of angiogenesis on the placental arterial endothelium i.e. regulation of ephrin-B2 expression, an arterial specific signalling molecule implicated in sprouting. The effect of insulin on ephrin-B2 in placental arterial endothelial cells as well as their particularly high expression levels of insulin receptors and receptors for vascular endothelial growth factors indicate that placental angiogenesis is likely to emanate from the arterial compartment and is stimulated by insulin. |
| Author | Ghaffari-Tabrizi, Nassim Lang, Ingrid Gauster, Martin Desoye, Gernot Hiden, Ursula Lang, Uwe |
| Author_xml | – sequence: 1 givenname: Ursula surname: Hiden fullname: Hiden, Ursula email: ursula.hiden@meduni-graz.at organization: Department of Obstetrics and Gynecology, Medical University of Graz, Auenbruggerplatz 14, 8036 Graz, Austria. ursula.hiden@meduni-graz.at – sequence: 2 givenname: Ingrid surname: Lang fullname: Lang, Ingrid – sequence: 3 givenname: Nassim surname: Ghaffari-Tabrizi fullname: Ghaffari-Tabrizi, Nassim – sequence: 4 givenname: Martin surname: Gauster fullname: Gauster, Martin – sequence: 5 givenname: Uwe surname: Lang fullname: Lang, Uwe – sequence: 6 givenname: Gernot surname: Desoye fullname: Desoye, Gernot |
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| SubjectTerms | Diabetes Mellitus - metabolism Endothelium, Vascular - physiopathology Ephrin-B2 - metabolism Female Humans Hyperglycemia - metabolism Insulin - physiology Maternal-Fetal Exchange Neovascularization, Physiologic Placenta - blood supply Placenta - metabolism Pregnancy Pregnancy in Diabetics - metabolism Pregnancy in Diabetics - physiopathology Pregnancy Trimester, Third Receptor, Insulin - metabolism |
| Title | Insulin action on the human placental endothelium in normal and diabetic pregnancy |
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