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Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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Cystatin C: A Promising Marker of Renal Function in Patients with Systemic Lupus Erythematosus?

Lígia Peixoto1, Patrício Aguiar1, Raquel de Bragança2

  • 1Serviço de Medicina I. Centro Hospitalar Lisboa Norte. Lisboa. Portugal.

Acta Medica Portuguesa
|October 1, 2015
PubMed

Insights

Cystatin C shows promise as a superior marker for detecting kidney function changes in systemic lupus erythematosus patients, potentially identifying chronic kidney disease earlier than creatinine.

Area of Science:

  • Nephrology
  • Rheumatology
  • Clinical Chemistry

Background:

  • Serum creatinine is the standard biomarker for assessing kidney function.
  • Cystatin C is increasingly recognized for its closer correlation with glomerular filtration rate (GFR) and prognostic value.
  • Systemic lupus erythematosus (SLE) is associated with a higher risk of chronic kidney disease (CKD).

Purpose of the Study:

  • To evaluate cystatin C as a potential marker of renal function in patients with SLE.
  • To compare the performance of cystatin C with creatinine in assessing GFR in this population.
  • To determine if cystatin C offers advantages over creatinine for CKD screening in SLE.

Main Methods:

  • A cohort of 37 SLE patients was studied.
  • Serum cystatin C and creatinine levels were measured.
  • GFR was estimated using five different formulas, including CKD-EPI creatinine and CKD-EPI cystatin C, with CKD-EPI creatinine as the reference.
  • Multivariate linear regression analyzed factors influencing cystatin C levels.

Main Results:

  • Cystatin C was elevated in 10 patients, while creatinine was not elevated in any.
  • A trend towards lower GFR estimates with CKD-EPI cystatin C compared to CKD-EPI creatinine was observed, particularly at lower GFRs.
  • CKD-EPI cystatin C reclassified 4 patients to having CKD and 1 patient to not having CKD.
  • Age was the only significant factor influencing cystatin C levels.

Conclusions:

  • Cystatin C demonstrates potential as a superior marker for renal function in SLE patients.
  • It may detect GFR changes earlier than creatinine, improving CKD screening.
  • Age is a significant confounding factor in cystatin C measurements, necessitating consideration in GFR estimation.
Abstract

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