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Evidence for direct renal injury as a consequence of glomerular complement activation
Journal of Immunology (Baltimore, Md. : 1950)
|April 1, 1986
Summary
Antibody-initiated glomerular complement activation directly injures the kidney, independent of neutrophils. This study shows complement components contribute to antibody-induced immune renal injury.
Area of Science:
- Nephrology
- Immunology
- Renal Physiology
Background:
- Antibody-initiated glomerular injury is often linked to inflammation.
- The direct role of complement activation in renal injury, independent of inflammatory cells, requires further investigation.
Purpose of the Study:
- To investigate the functional consequences of antibody-initiated glomerular complement activation in an environment devoid of circulating inflammatory cells.
- To determine if activated complement components directly contribute to renal injury.
Main Methods:
- Isolated perfused kidney (IPK) model used to control experimental conditions.
- Antibody bound to glomerular basement membrane (GBM) with subsequent perfusion using albumin solution, fresh plasma, or decomplemented plasma.
- Measurement of urinary protein excretion, renal vascular resistance (RVR), and glomerular filtration rate (GFR).
Main Results:
- Glomerular complement activation, indicated by C3 deposition, significantly increased protein excretion and RVR, while decreasing GFR.
- IPK perfused with decomplemented plasma showed no glomerular complement deposition or increased renal injury.
- The observed renal injury occurred independently of neutrophils.
Conclusions:
- Antibody-initiated glomerular complement activation causes direct, neutrophil-independent renal injury.
- Activated complement components play a direct role in antibody-induced immune renal injury.
- Complement's role extends beyond inflammatory cell recruitment, directly impacting renal tissue.