- Renal disease associated with systemic lupus erythematosus (SLE)
- American College of Rheumatology (ACR) criteria: persistent proteinuria >500 mg/day or ≥3 on dipstick and/or presence of cellular casts; alternatively, spot urine protein-to-creatinine ratio (UPCR) >0.5 and “active urinary sediment” (>5 RBC/HPF, >5 WBC/HPF in absence of infection, or cellular casts—RBC or WBC casts) (1)
- Clinical manifestations primarily due to immune complex–mediated glomerular disease. Tubulointerstitial and vascular involvement often coexist. Diagnosis is based on clinical findings, urine abnormalities, autoantibodies, and renal biopsy.
- Treatment and prognosis depend on International Society of Nephrology/Renal Pathology Society (ISN/RPS) histologic class.
- Early diagnosis improves renal outcomes.
- Peak incidence of SLE is 15 to 45 years of age. Mean age of diagnosis is between 25 and 30 years of age.
- Predominant sex: female > male (10:1)
- Once SLE develops, lupus nephritis (LN) affects both genders equally; it is more severe in children and men and less severe in older adults.
- More common in African American and Asian populations.
- SLE: 1 to 22/100,000
- Up to 60% of SLE patients develop LN over time; 25–50% of SLE patients have nephritis as the initial presentation.
LN is more common and more severe in children: 60–80% of children have LN at or soon after SLE onset.
SLE: 7 to 159/100,000
Etiology and Pathophysiology
- Immune complex–mediated inflammation injures glomeruli, tubules, interstitium, and vasculature.
- Glomeruli: Varying degrees of mesangial proliferation, crescent formation, and fibrinoid necrosis cause reduced glomerular filtration rate (GFR).
- Persistent inflammation (chronicity) leads to sclerosis and glomerular loss.
- Tubulointerstitial injury (edema, inflammatory cell infiltrate acutely; tubular atrophy in chronic phase) with or without tubular basement membrane immune complex deposition leads to reduced renal function.
- Vascular lesions: immune complex deposition and noninflammatory necrosis in arterioles
- SLE is a multifactorial disease, with multigenic inheritance; exact etiology remains unclear.
- Defective T-cell autoregulation and polyclonal B-cell hyperactivity contribute to dysregulated apoptosis. Impaired clearance of apoptotic cells inhibits self-tolerance to nuclear antigen.
- Anti-DNA, anti-C1q, anti–α-actin, and other nuclear component autoantibodies develop.
- Deposition of circulating immune complexes or autoantibodies attaching to local nuclear antigens leads to complement activation, inflammation, and tissue injury.
- Interaction of genetic, hormonal, and environmental factors leads to great variability in LN severity.
- Polygenic inheritance; clustering in families, ~25% concordance in identical twins
- Interaction of general SLE susceptibility genes with more renal-specific genes and epigenetic changes
Younger age, African American or Hispanic race, more ACR criteria for SLE, longer disease duration, hypertension, lower socioeconomic status, family history of SLE, anti-dsDNA antibodies, low albumin to globulin ratio
Commonly Associated Conditions
Other organ systems often involved in SLE.
There's more to see -- the rest of this topic is available only to subscribers.
Domino, Frank J., et al., editors. "Lupus Nephritis." 5-Minute Clinical Consult, 27th ed., Wolters Kluwer, 2020. www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/117507/all/Lupus_Nephritis.
Lupus Nephritis. In: Domino FJF, Baldor RAR, Golding JJ, et al, eds. 5-Minute Clinical Consult. Wolters Kluwer; 2020. https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/117507/all/Lupus_Nephritis. Accessed June 5, 2023.
Lupus Nephritis. (2020). In Domino, F. J., Baldor, R. A., Golding, J., & Stephens, M. B. (Eds.), 5-Minute Clinical Consult (27th ed.). Wolters Kluwer. https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/117507/all/Lupus_Nephritis
Lupus Nephritis [Internet]. In: Domino FJF, Baldor RAR, Golding JJ, Stephens MBM, editors. 5-Minute Clinical Consult. Wolters Kluwer; 2020. [cited 2023 June 05]. Available from: https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/117507/all/Lupus_Nephritis.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Lupus Nephritis ID - 117507 ED - Domino,Frank J, ED - Baldor,Robert A, ED - Golding,Jeremy, ED - Stephens,Mark B, BT - 5-Minute Clinical Consult, Updating UR - https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/117507/all/Lupus_Nephritis PB - Wolters Kluwer ET - 27 DB - 5-Minute Clinical Consult DP - Unbound Medicine ER -