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Pregnancy induced hypertension: a role for peroxidation in microvillus plasma membranes

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Abstract

It has been recently hypothesized that in PIH a placental oxidant-antioxidant imbalance might cause the release of lipoperoxidation products into the circulation, with subsequent damage of endothelial cell membranes. In this hypothesis the endothelial cell and further increase in circulating lipoperoxide levels, which are by themselves able to induce smooth muscle constriction and increased pressor responsiveness to angiotensin II. In order to investigate this issue, we studied the basal content of lipid peroxides in terms of malondialdehyde (MDA) in the syncytiotrophoblast plasma membranes (SPM) from PIH women. Moreover, we investigated the susceptibility to peroxidation of SPM using anin vitro oxidative stress as a tool to verify the predisposition to thein vivo development of peroxidation products. The fatty acid composition of the membranes was also analyzed. Microvillus membrane lipoperoxide concentrations were significantly increased in PIH women (62.8±7.6 ng MDA/mg prot) compared with healthy pregnant subjects (37.6±4.8 ng MDA/mg prot; p<0.01).

The formation of TBARS under the action of phenylhydrazine was significantly greater in PIH women (90.3±7.4 mmol MDA/mol cholesterol) than in normal pregnant subjects (68.6±6.4 mmol MDA/mol cholesterol; p<0.01). In PIH microvillus membrane we also observed a significant increase of the content of polyunsaturated arachidonic acid.

The increased susceptibility to oxidative stress of SPMs from PIH women might be due either to reduced antioxidant systems or to an abnormality of the lipid composition of the membrane. The present work also demonstrated in PIH a reduction in the SPM content of saturated fatty acids with an increase in polyunsaturated fatty acids, which are the major substrate for peroxidation. On the other hand, the higher lipoperoxidation may be due to the observed increased susceptibility to peroxidative stress, to a primary reduction in placental perfusion with tissue hypoxia or to both factors, which can potentiate each other.

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Authors and Affiliations

  1. Institute of Obstetrics and Gynecology, University of Ancona, School of Medicine, Ancona, Italy

    N. Cester & R. Magnanelli

  2. Institute of Biochemistry, University of Ancona, School of Medicine, Ancona, Italy

    R. Staffolani, R. A. Rabini, E. Salvolini, R. Galassi & L. Mazzanti

  3. Department of Obstetrics and Gynecology, Tor Vergata University, Roma, Italy

    C. Romanini

Authors
  1. N. Cester
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  2. R. Staffolani
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  3. R. A. Rabini
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  4. R. Magnanelli
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  5. E. Salvolini
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  6. R. Galassi
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  7. L. Mazzanti
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  8. C. Romanini
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Cester, N., Staffolani, R., Rabini, R.A. et al. Pregnancy induced hypertension: a role for peroxidation in microvillus plasma membranes. Mol Cell Biochem 131, 151–155 (1994). https://doi.org/10.1007/BF00925951

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  • DOI: https://doi.org/10.1007/BF00925951

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