Association of the osteopontin rs1126616 polymorphism and a higher serum osteopontin level with lupus nephritis

Salimi,Saeedeh; Noora,Mehrangiz; Nabizadeh,Sima; Rezaei,Mahnaz; Shahraki,Hossain; Milad,Mohammadoo-Khorassani; Naghavi,Anoosh; Farajian-Mashhadi,Farzaneh; Zakeri,Zahra; Sandoughi,Mahnaz

doi:10.3892/br.2016.589

Association of the osteopontin rs1126616 polymorphism and a higher serum osteopontin level with lupus nephritis

Authors:
- Saeedeh Salimi
- Mehrangiz Noora
- Sima Nabizadeh
- Mahnaz Rezaei
- Hossain Shahraki
- Mohammadoo-Khorassani Milad
- Anoosh Naghavi
- Farzaneh Farajian-Mashhadi
- Zahra Zakeri
- Mahnaz Sandoughi
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Affiliations: Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan 9816743175, Iran, Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan 9816743175, Iran, Department of English Language, School of Medicine, Zahedan University of Medical Sciences, Zahedan 9816743175, Iran, Department of Internal Medicine, School of Medicine, Zahedan University of Medical Sciences, Zahedan 9816743175, Iran
Published online on: February 2, 2016 https://doi.org/10.3892/br.2016.589
Pages: 355-360

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Abstract

Osteopontin (OPN) is a chemokine-like glycoprotein that has a prominent role in regulating inflammation and immunity. OPN polymorphisms and elevated OPN levels are associated with systemic lupus erythematosus (SLE) in several populations. The aim of present study was to evaluate the association between the OPN rs1126616 polymorphism and OPN level with SLE susceptibility. A total of 163 SLE patients and 180 age‑, gender‑ and ethnically matched controls were genotyped for the rs1126616 polymorphism by the polymerase chain reaction‑restriction fragment length polymorphism method. Serum OPN levels were assayed by the enzyme‑linked immunosorbent assay. There was no association between the OPN rs1126616 C/T polymorphism and SLE. The frequency of the OPN rs1126616 CT genotype was significantly higher in SLE patients with nephritis compared to SLE patients without nephritis and controls. Additionally, the frequency of TT genotypes was higher in SLE patients with nephritis compared to controls. The serum OPN levels were significantly higher in SLE patients compared to controls (50.6±22 vs. 35.6±15.8 ng/ml, P<0.001). Increased serum OPN levels were observed in SLE patients with lupus nephritis and joint symptoms. There was no correlation between OPN levels and the OPN rs1126616 polymorphism. The present data suggest that the CT and TT genotypes of the OPN rs1126616 polymorphism could be a risk factor for lupus nephritis. The OPN level is associated with SLE and certain SLE manifestations. However, there was no association between the OPN rs1126616 C/T polymorphism and SLE susceptibility.

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