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Levels of urinary complement factor H in patients with IgA nephropathy are closely associated with disease activity

J-J Zhang1, L Jiang, G Liu

  • 1Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China.

Scandinavian Journal of Immunology
|June 11, 2009
PubMed

Insights

Urinary factor H shows promise as a biomarker for kidney injury in IgA nephropathy (IgAN). Higher levels correlate with more severe disease stages and kidney deposition, indicating its predictive value.

Area of Science:

  • Nephrology
  • Immunology
  • Complement System Biology

Background:

  • Factor H is crucial for regulating the alternative pathway of the complement system.
  • Immunoglobulin A nephropathy (IgAN) is a common cause of glomerulonephritis.
  • Identifying reliable biomarkers for renal injury in IgAN is essential for patient management.

Purpose of the Study:

  • To evaluate the predictive value of urinary factor H as a biomarker for renal injury in IgA nephropathy (IgAN).

Main Methods:

  • Measured urinary factor H concentration (normalized to urinary creatinine) in 202 IgAN patients and 60 healthy controls.
  • Classified patients into three groups based on Haas score (I-II, III, IV-V).
  • Investigated kidney co-deposition of factor H and C3b using confocal microscopy.

Main Results:

  • Urinary factor H levels were significantly elevated in patients with higher Haas scores (Group 3 > Group 2 > Group 1).
  • Higher urinary factor H levels were observed in patients with kidney factor H deposition compared to those without.
  • Urinary factor H levels demonstrated a positive correlation with the severity of renal injury in IgAN.

Conclusions:

  • Urinary factor H shows potential as a non-invasive biomarker for assessing kidney injury severity in IgA nephropathy.
  • Factor H levels in urine may help predict disease progression and guide treatment strategies in IgAN patients.

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