Abstract
Background
Fibrogenic cytokines are recognized as putative drivers of disease activity and histopathological deterioration in various kidney diseases. We compared urinary transforming growth factor β1 (U-TGF-β1) and endothelin 1 (U-ET-1) levels across body mass index classes and assessed their association with the level of urinary angiotensinogen (U-AGT), a biomarker of intrarenal renin–angiotensin–aldosterone system (RAAS).
Methods
The was a cross-sectional evaluation of 302 children aged 8–9 years. Ambulatory blood pressure (BP), insulin resistance (HOMA-IR), aldosterone level and renal function were evaluated. U-ET-1, U-TGF-β1 and U-AGT levels were determined by immunoenzymatic methods.
Results
Obese children presented with the lowest levels of U-ET-1 and U-TGF-β1, but the difference was only significant for U-ET-1. In obese children, the median levels of both U-ET-1 and U-TGF-β1 tended to increase across tertiles (T1–T3) of U-AGT (U-ET-1: T1, 19.9 (14.2–26.3); T2, 32.5 (23.3–141.6); T3, 24.8 (18.7–51.5) ng/g creatinine, p = 0.007; U-TGF-β1: T1, 2.2 (1.8–4.0); T2, 4.3 (2.7–11.7); T3, 4.9 (3.8–10.1) ng/g creatinine, p = 0.004]. In multivariate models, in the obese group, U-ET-1 was associated with HOMA-IR and aldosterone and U-AGT levels, and U-TGF-β1 was associated with U-AGT levels and 24 h-systolic BP.
Conclusions
Whereas the initial hypothesis of higher levels of urinary fibrogenic cytokines in obese children was not confirmed in our study, both TGF-β1 and U-ET-1 levels were associated with U-AGT level, which likely reflects an early interplay between tissue remodeling and RAAS in obesity-related kidney injury.
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Acknowledgments
The authors gratefully acknowledge the families enrolled in Generation XXI for their kindness, all members of the research team for their enthusiasm and perseverance and the participating hospitals and their staff for their help and support.
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The ObiKid study was approved by the Ethics Committee of Centro Hospitalar São João, E.P.E. and Faculty of Medicine of the University of Porto and complies with the Helsinki Declaration and the current national legislation. Written informed consent from parents (or their legal substitute) and verbal assent from children was obtained, concerning information and biological sample gathering.
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None of the authors have any financial or nonfinancial competing interests concerning the present study.
Sources of funding
This project was supported by the Portuguese Foundation for Science and Technology, Lisbon, Portugal (PTDC/DTP-PIC/0239/2012), that granted the funds for study design and data collection and analysis. Liane Correia-Costa was supported by Portuguese Foundation for Science and Technology (grant SFRH/SINTD/95898/2013), Teresa Sousa was supported by a Ciência 2008 Contract, funded by Portuguese Foundation for Science and Technology and POPH/FSE (EC) and Franz Schaefer was supported by the ERA-EDTA Research Programme and the KfH Foundation for Preventive Medicine.
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Liane Correia-Costa and Manuela Morato contributed equally as first authors to this paper.
Ana Azevedo and António Albino-Teixeira contributed equally to the supervision and scientific revision of this paper.
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Correia-Costa, L., Morato, M., Sousa, T. et al. Urinary fibrogenic cytokines ET-1 and TGF-β1 are associated with urinary angiotensinogen levels in obese children. Pediatr Nephrol 31, 455–464 (2016). https://doi.org/10.1007/s00467-015-3232-1
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DOI: https://doi.org/10.1007/s00467-015-3232-1