Serum levels of leptin, osteopontin, and sclerostin in patients with and without knee osteoarthritis

Abstract

Objective

To investigate the relationship between leptin, osteopontin (OPN), sclerostin (SOST) and severity of knee osteoarthritis (KOA).

Methods

The study included 148 consecutive patients with knee OA and 101 non-KOA subjects enrolled in this cross-sectional study. All patients fulfilled the American College of Rheumatology criteria for primary knee OA. Severity of the disease was assessed using plain radiography of the affected knee, according to the Kellgren and Lawrence classification. Fasting blood samples were obtained from all patients and controls; the serum samples were kept at − 80 °C before assessment of leptin, OPN, and SOST using a multiplex particle-based flow cytometric assay.

Results

KOA patients group compared with the control group, serum leptin (KOA, 26581.7 ± 2011.5 pg/ml, vs control,6936.4 ± 702.2 pg/ml),OPN (KOA, 4908.3 ± 769.4 pg/ml, vs control, 2182.5 ± 217.8 pg/ml), and SOST (KOA, 2481.9 ± 543.5 pg/ml, vs control, 1288.9 ± 267.7 pg/ml) in the KOA group were higher than control group; there were also differences in three bone metabolic factors between male and female in the KOA group; meanwhile, there was correlation between each factor and the incidence of KOA.

Conclusion

Our study of 249 serum samples was conducted. Serum leptin, OPN, and SOST were significantly increased in KOA patients, and there was an internal correlation; these findings could, at best, contribute to the identification of novel targets for medical interventions.

Key Points
The aim of this study was to assess the relationships of radiographic knee OA with altered serum levels of leptin, OPN, and SOST. Our study of 249 serum samples was conducted. Serum leptin, OPN, and SOST were significantly increased in KOA patients compared with control group. There were gender differences in the concentration of three serum bone turnover factors in KOA group and control group. Serum SOST concentration increased with Kellgren-Lawrence (K-L) grading. We found that serum leptin, OPN, and SOST were significantly increased in KOA patients, and there was an internal correlation. Leptin had a remarkable diagnostic value in the incidence of KOA.

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Fig. 1

Abbreviations

OA:

Osteoarthritis

KOA:

knee osteoarthritis

OPN:

osteopontin

SOST:

sclerostin:

K-L:

Kellgren-Lawrence

BMI:

body mass index

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Funding

This work was supported by the National Science Foundation of China (81672239).

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Correspondence to Huajian Teng or Qing Jiang.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the regional research committee (Regional Ethical Review Board for CFDA-GCP/ICH-GCP) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Min, S., Shi, T., Han, X. et al. Serum levels of leptin, osteopontin, and sclerostin in patients with and without knee osteoarthritis. Clin Rheumatol (2020). https://doi.org/10.1007/s10067-020-05150-z

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Keywords

  • Serum
  • Leptin
  • Knee osteoarthritis
  • Osteopontin
  • Sclerostin