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Compensatory elevated serum intermedin levels are associated with increased vascular calcification in hemodialysis patients

  • Nephrology - Original Paper
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Abstract

Introduction

Vascular calcification (VC), which is a pathological process of abnormal calcium and phosphorus deposition in blood vessels, valves, heart and other tissues, is highly prevalent and predicts mortality in dialysis patients. Its mechanisms are complex and unclear. We presume that intermedin (IMD), a kind of small molecule active peptide, may play roles in VC in hemodialysis (HD) patients. This study aims to evaluate serum IMD levels and establish their relation to VC and other parameters in HD patients.

Methods

A total of 116 patients on maintenance HD treatment and 52 age- and sex-matched healthy controls were enrolled in this study. Serum IMD levels were measured by radioimmunoassay (RIA). VC was evaluated by abdominal aortic calcification scores.

Results

Serum IMD levels were significantly lower in HD patients than in controls [24.89 (13.55, 50.24) pg/ml vs. 137.79 (93.21, 201.64) pg/ml, P < 0.0001]. In addition, IMD was negatively correlated with the serum phosphate level (P = 0.036) in HD patients. However, compared with the group whose IMD levels were above the median, patients with IMD levels less than the median had a lower incidence of VC (P = 0.031). Multivariate logistic regression analyses revealed that serum IMD levels more than 24.89 pg/ml (P = 0.014, OR = 0.285), higher serum iPTH levels (P < 0.0001, OR = 1.093) and older age (P = 0.009, OR = 1.003) were significant independent determinant factors for VC in HD patients.

Conclusion

The serum IMD levels were significantly lower in HD patients than that in healthy group. In addition to higher PTH levels and older age, compensatory elevated IMD levels may be an independently determinant factor for VC in HD patients. This was the first study about IMD and VC in dialysis patients.

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The data and materials in the study were available.

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Acknowledgements

We are grateful to all staff of the Hemodialysis Dialysis Center at Peking University Third Hospital and patients who participated in this project.

Funding

This article was supported by the National Natural Science Foundation of China under Grant No. 81873619 and No. 81570663 to Aihua Zhang; The Key Clinical Program of Peking University Third Hospital under Grant BYSY2018024 to Lian He.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by WB. The first draft of the manuscript was written by WB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Lian He or Aihua Zhang.

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The authors have no competing interests to declare that are relevant to the content of this article.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of Peking University Third Hospital (ethical approval number: M2018043). And, all patients signed the written informed consent.

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Bao, W., He, L. & Zhang, A. Compensatory elevated serum intermedin levels are associated with increased vascular calcification in hemodialysis patients. Int Urol Nephrol 54, 3001–3007 (2022). https://doi.org/10.1007/s11255-022-03240-2

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