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Urinary complement proteins in IgA nephropathy progression from a relative quantitative proteomic analysis.

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Urinary complement proteins, including the membrane attack complex (MAC), increase with IgA nephropathy (IgAN) progression. These proteins show potential as biomarkers for monitoring kidney disease progression.

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Area of Science:

  • Nephrology
  • Proteomics
  • Biochemistry

Background:

  • IgA nephropathy (IgAN) is a primary cause of end-stage renal disease (ESRD).
  • Urinary biomarkers offer a non-invasive method for assessing kidney injury.
  • Understanding protein changes in urine can elucidate disease mechanisms.

Purpose of the Study:

  • To analyze urinary complement proteins in IgA nephropathy (IgAN) progression.
  • To identify potential urinary biomarkers for IgAN using quantitative proteomics.
  • To investigate the role of complement pathways in IgAN pathogenesis.

Main Methods:

  • Quantitative proteomics (iTRAQ and LC-MS/MS) was employed for global urinary protein profiling in IgAN patients and controls.
  • Western blotting and parallel reaction monitoring (PRM) were used for validation of identified proteins.
  • Patients were stratified based on estimated glomerular filtration rate (eGFR) to analyze disease progression.

Main Results:

  • 747 urinary proteins were identified, with distinct profiles between IgAN and primary membranous nephropathy (pMN) patients.
  • Complement and coagulation pathways were significantly activated in IgAN.
  • Increased abundance of complement proteins, including C3, MAC, CFB, and C8A, correlated with IgAN progression. Specific lectin pathway (LP) and alternative pathway (AP) proteins were elevated.
  • A combination of CFB and MAdCAM-1 showed promise as a biomarker for monitoring IgAN.

Conclusions:

  • Abundant urinary complement components indicate the involvement of AP and LP activation in IgAN.
  • Urinary complement proteins represent promising biomarkers for evaluating IgAN progression.
  • Proteomic analysis provides insights into the molecular mechanisms of IgAN.