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Oligomeric proanthocyanidins protect against HK-2 cell injury induced by oxalate and calcium oxalate monohydrate crystals

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Abstract

The purpose of the study was to test whether the antioxidants oligomeric proanthocyanidins (OPCs) could provide protection against oxalate and calcium oxalate monohydrate crystals (COM) toxicity in HK-2 cells. Four groups were chosen for the study: negative control group, positive control group (COM + oxalate), OPCs group (OPCs + COM + oxalate), Vit E group (Vit E + COM + oxalate). HK-2 cells were exposed for 4, 8, 12 and 24 h. The activity of HK-2 cell was assessed by MTT. Cellular injury was assessed by activity of Na+/K+ ATP enzyme. Peroxidation level was assessed by malondialdehyde (MDA) content in medium and activity of superoxide dismutase (SOD). Morphological changes of HK-2 cell after exposed for 4 and 12 h in each group were observed under Transmission electron microscope (TEM). The effects of OPCs and VitE on oxalate- and COM-exposed cells were tested. After exposed to oxalate and COM crystals, activity of cells, Na+/K+ ATP enzyme and SOD enzyme showed a significant reduction, and MDA content in medium was significantly increased. OPCs group: the addition of OPCs significantly increased activity of cell, SOD and Na+/K+ ATP enzyme while MDA content was significantly decreased compared with the positive control group. VitE group: compared with the positive control group, activity of HK-2 cell, Na+/K+ ATP enzyme was not significantly changed while SOD activity was restored, and MDA content was significantly decreased after the addition of Vit E. Morphological structure of HK-2 cell was extremely changed as observed under TEM after exposure to high level of COM crystals and oxalate. After the addition of OPCs or Vit E, amounts of cells with vacuoles formed in cytoplasms, karyotheca dissolved and nucleolus disappeared were less than in positive control group. The morphological structure changing in OPCs group was slighter than that in Vit E group. OPCs and vitamin E administration may prevent oxalate- and COM-mediated peroxidative injury, restoring intracellular antioxidant enzyme activity. The protection rendered by OPCs was greater than that of vitamin E.

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Authors and Affiliations

  1. Department of Urology, Bejing Cancer Hospital, 52# FuChengLu, Beijing, 100142, China

    Shuo Wang, Peng Du, Ning Zhang, Jia Liu, Xingxing Tang, Qiang Zhao & Yong Yang

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  1. Shuo Wang
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  2. Peng Du
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  3. Ning Zhang
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  4. Jia Liu
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  5. Xingxing Tang
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  6. Qiang Zhao
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  7. Yong Yang
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Correspondence to Peng Du.

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The authors declare that they have no financial and personal relationships with other people or organizations that can inappropriately influence their work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the entitled manuscript.

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Wang, S., Du, P., Zhang, N. et al. Oligomeric proanthocyanidins protect against HK-2 cell injury induced by oxalate and calcium oxalate monohydrate crystals. Urolithiasis 44, 203–210 (2016). https://doi.org/10.1007/s00240-015-0826-9

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  • DOI: https://doi.org/10.1007/s00240-015-0826-9

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