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The status of biochemical and molecular markers of oxidative stress in Preeclamptic Saudi patients

Author(s):

Yazeed A. Al-Sheikh* and Khaled Y. AL-Zahrani  

Abstract:


Purpose: In the light of contradictory results and paucity of information, this comprehensive study examines the activities and levels of key antioxidants and oxidants/pro-oxidants in preeclamptic patients.

Methods: Antioxidants including glutathione peroxidase, glutathione reductase, glutathione-S-transferase, superoxide dismutase, catalase, reduced glutathione, selenium, zinc, copper and manganese, as well as marker oxidants/pro-oxidants including hydrogen peroxide, superoxide anions, malondialdehyde, protein carbonyls and oxidized glutathione were determined in plasma and placental tissues of non-pregnant, healthy pregnant and preeclamptic subjects.

Results: Data indicated that all plasma antioxidants underwent moderate but significant decreases (p< 0.05) in healthy pregnant women, , and much more significant ones (p< 0.0001) in preeclamptic patients, when both were compared to non-pregnant subjects. Furthermore, whereas all plasma antioxidants underwent significant decreases (p< 0.001) in preeclamptic patients compared to healthy pregnant subjects, their placental activities and levels were very significantly decreased (p< 0.0001). However, copper plasma and placental levels were unchanged in all study groups. In contrast, there were increases similar in magnitude and significance of all plasma and placental oxidants/pro-oxidants compared among the three study groups leading to equally significant decreases in the reduced/oxidized glutathione ratios. In addition, gene transcripts of all antioxidant enzymes underwent marked downregulation (p< 0.0001) in placental tissue of preeclamptic patients compared to healthy pregnant subjects.

Conclusion: Data indicated a metabolic shift in favor of oxidative stress more pronounced in placental tissue of preeclamptic patients compared to healthy pregnant/non-pregnant subjects. We postulate that selenium, zinc and manganese supplements could be beneficial for alleviation of the noted oxidative stress in preeclamptic patients.

Keywords:

Preeclampsia, placental tissue, oxidative stress, micronutrients, antioxidant gene transcripts.

Affiliation:

Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh



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