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Complement activation is present in primary focal segmental glomerulosclerosis (FSGS). Elevated plasma Ba levels indicate more severe FSGS disease and correlate with kidney function and proteinuria.

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Area of Science:

  • Nephrology
  • Immunology
  • Clinical Medicine

Background:

  • Pre-clinical studies suggest complement activation contributes to kidney injury in FSGS.
  • Complement proteins are found in FSGS glomeruli, but their role (activation vs. trapping) is unclear.

Purpose of the Study:

  • To determine if complement activation is part of the primary FSGS disease process.
  • To measure complement activation fragments in FSGS patients' plasma and urine.

Main Methods:

  • Analyzed plasma and urine samples from 19 FSGS patients and compared them to healthy controls and patients with CKD, vasculitis, and lupus nephritis.
  • Measured levels of complement fragments Ba, Bb, C4a, and sC5b-9.

Main Results:

  • FSGS patients had significantly higher plasma and urine Ba, C4a, and sC5b-9 levels at diagnosis compared to controls.
  • Plasma Ba levels correlated inversely with eGFR and positively with proteinuria.
  • Elevated complement fragments suggest active complement system involvement in FSGS.

Conclusions:

  • The complement system is activated in primary FSGS.
  • Elevated plasma Ba levels correlate with disease severity and may serve as a prognostic marker.
  • Further research is needed to confirm findings and elucidate the prognostic significance of complement activation in FSGS.