Abstract
Background
IgA nephropathy (IgAN), the most common glomerulonephritis in the world, is an important cause of end-stage renal disease (ESRD). It is necessary to explore new prognostic markers for predicting the activity and progress of IgAN. There are few studies on new prognostic markers in IgAN patients with high proportion of glomerulosclerosis. This study aims to explore the value of urine IgG in predicting the prognosis of IgAN patients.
Methods
The primary end point of this retrospective study was a composite event with a reduction in estimated glomerular filtration rate (eGFR) of ≥ 50% or ESRD or death. This study assessed the association between urinary IgG and clinicopathological parameters, as well as the prognosis of a high proportion of patients with global glomerulosclerotic IgAN.
Results
This study included 105 IgAN patients with high proportion of global glomerulosclerotic. The level of urinary protein IgG was significantly correlated with clinical prognostic factors. The level of urinary protein IgG was positively correlated with urinary protein excretion (rs = 0.834, P < 0.001), CRP (rs = 0.375, P < 0.001), and C4 (rs = 0.228, P = 0.019), and negatively correlated with eGFR (rs = – 0.307, P = 0.001). In addition, the level of urinary IgG increased with the increase of tubulointerstitial injury rate, which was positively correlated with endothelial cell proliferation and crescent (all P < 0.05). Prognostic analysis using the Cox proportional hazard regression model and Kaplan–Meier survival curve further determined that urine IgG is an independent risk factor for the prognosis of IgAN with high proportion of global glomerulosclerosis.
Conclusions
This study determined that urine IgG can be used as a useful predictor of the prognosis of IgAN patients with high proportion global glomerulosclerosis. The mechanism of urine IgG trends in IgAN with high proportion of glomerulosclerosis needs further study.
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Data availability statement
The data used to support the findings of this study are restricted by the Ethics Committee of Guangdong Provincial Hospital of Chinese Medicine to protect the patient privacy. Data are available from Guangdong Provincial Hospital of Chinese Medicine for researchers who meet the criteria for access to confidential data.
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Acknowledgements
The study was funded by Research Project for Practice Development of National TCM Clinical Research Bases (Project no. JDZX2015202) and National Key R&D Program "Research on Modernization of Traditional Chinese Medicine" (Project no. 2019YFC1709903).
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Research idea, study design, article writing, and guidance on revision: CZ; article writing and revision: XX; article revision and submission: XH; data collection, collation, and summary: YC, JL, MS, YH, and XL; provide medical records and renal biopsy specimens: QL, XL, KB, LW, and LL; pathological diagnosis: HY.
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The study was approved by the Ethics Committee of Guangdong Provincial Hospital of Chinese Medicine.
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Xu, X., Huang, X., Chen, Y. et al. The role of urine IgG in the progression of IgA nephropathy with a high proportion of global glomerulosclerosis. Int Urol Nephrol 54, 323–330 (2022). https://doi.org/10.1007/s11255-021-02858-y
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DOI: https://doi.org/10.1007/s11255-021-02858-y