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• W1978511654 abstract "Nitric oxide (NO) and carbon monoxide (CO) are novel gaseous chemical messengers that play key roles in cell function and cell-cell communication in many organ systems, including the cardiovascular system. Although the presence of NO synthase (NOS) in the placenta and its role in the regulation of fetoplacental and uteroplacental blood flow are well established, little is known about placental expression and activity of heme oxygenase (HO), the enzyme that catalyses the oxidation of heme to CO, biliverdin and iron, during gestation. The objectives of this study were to elucidate the localization of HO-1 and HO-2 isoforms relative to NOS III protein, and to determine the enzymatic activity of HO in the placenta of the guinea-pig during gestation. Placentae were obtained from pregnant guinea-pigs at gestational day (GD) 34, 50, 62 and full term (term, about GD 68). Immunohistochemical localization of HO-1, HO-2 and NOS III protein was conducted using selective polyclonal antibodies. HO activity was determined by using a gas chromatographic method to measure the rate of formation of CO from heme. Faint staining for HO-1 was observed in the adventitial layer of larger fetal blood vessels of the placenta at GD 34. The intensity of this staining was higher at GD 50 and GD 62, and decreased at full term. Similar areas in serial sections of placentae obtained at these selected times during gestation exhibited lower staining intensity when incubated with anti-HO-2 antiserum. Placental HO activity was significantly increased (P<0.05) at GD 62 compared with GD 34, GD 50 and full term. NOS III (endothelial constitutive NOS) staining was highest at GD 34, decreasing thereafter, and was localized mostly to trophoblast lining maternal channels. The data demonstrate that, in the guinea-pig, placental HO and NOS differ in tissue localization during the second half of gestation, with expression of HO protein and its catalytic activity being higher during near-term pregnancy. In a preliminary immunohistochemical investigation of the full-term human placenta, HO-1 protein was localized primarily in the adventitial region of fetal blood vessels of stem chorionic villi. In view of the vasodilator action of CO and NO, the HO and NOS systems may play key roles in the regulation of placental haemodynamics." @default.
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• W1978511654 date "1998-09-01" @default.
• W1978511654 modified "2023-10-16" @default.
• W1978511654 title "Heme oxygenase and nitric oxide synthase in the placenta of the guinea-pig during gestation" @default.
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• W1978511654 doi "https://doi.org/10.1016/s0143-4004(98)91044-x" @default.
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