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Updated: Jan 17, 2026

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
Published on: June 8, 2022
Obesity is an independent poor prognostic factor in lupus nephritis
Francy Cuervo1,2, Antoine Enfrein1, Hans-Joachim Anders3
1Department of Rheumatology, Cliniques Universitaires Saint-Luc, Pôle de Pathologies Rhumatismales Inflammatoires et Systémiques, UCLouvain, Brussels, Belgium.
Insights
Obesity (body mass index ≥30 kg/m²) is a significant risk factor for chronic kidney disease G3 (CKD G3) in lupus nephritis (LN). Weight management is crucial for improving long-term kidney outcomes in LN patients.
Area of Science:
- Nephrology
- Rheumatology
- Internal Medicine
Background:
- Lupus nephritis (LN) is a severe complication of systemic lupus erythematosus.
- Chronic kidney disease (CKD) progression is a major concern in LN patients.
- The role of obesity as a risk factor for CKD in LN requires further investigation.
Purpose of the Study:
- To determine if obesity is a risk factor for developing chronic kidney disease G3 (CKD G3) in patients with lupus nephritis (LN).
- To compare the rates of complete renal remission, renal flare, and CKD G3 between obese and non-obese LN patients.
Main Methods:
- Retrospective review of 132 biopsy-proven incident LN cases with quarterly data.
- Comparison of outcomes between obese (BMI ≥30 kg/m²) and non-obese patients.
- Analysis of time to CKD G3, time to renal flare, and long-term CKD progression risk.
Main Results:
- Obesity was associated with a statistically shorter time to CKD G3 and renal flare.
- Obesity significantly increased the long-term risk of CKD progression (HR = 2.72).
- Multivariate analysis confirmed obesity as an independent risk factor for CKD G3 (p = .029).
Conclusions:
- A body mass index (BMI) of 30 kg/m² or higher is an independent poor prognostic factor for CKD progression in LN.
- Weight control should be emphasized in the management of LN patients to mitigate CKD risk.
- Obesity independently contributes to worse kidney outcomes in lupus nephritis.
Abstract:
ObjectiveTo investigate whether obesity is a risk factor for chronic kidney disease G3 (CKD G3; eGFR <60 mL/min/1.73 m2) in lupus nephritis (LN).MethodsWe retrospectively reviewed 132 cases of biopsy-proven class III, IV or V incident LN for which quarterly data were available during a long follow-up period (median 140 months). Rates of complete renal remission, renal flare and CKD G3 were compared between obese (body mass index ≥30 kg/m2) and non-obese patients. Complete renal remission was defined as a urine protein to creatinine ratio (uPCR) < 0.5 g/g and a serum creatinine value <120 % of baseline. Renal flare was defined as the reappearance of an uPCR >1 g/g, leading to a repeat kidney biopsy and/or treatment change.ResultsBaseline characteristics of obese patients did not differ from non-obese patients. By contrast, time to CKD G3 and time to renal flare were statistically shorter in obese patients. Obesity significantly increased long-term risk for the progression of CKD [HR = 2.72 (CI95% 1.11-6.64), p = .028]. In a multivariate analysis, obesity was an independent risk factor for CKD G3 (p = .029).ConclusionA BMI ≥30 kg/m2 is an independent poor prognostic factor for the progression of CKD in LN. More attention should therefore be paid to weight control in LN patients.
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