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An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
Published on: November 1, 2018
Complement and glomerular disease - a natural history study
Insights
Primary abnormalities in the complement system may predispose patients to glomerular lesions. However, these complement defects did not impact patient prognosis in this study.
Area of Science:
- Nephrology
- Immunology
- Clinical Chemistry
Background:
- Glomerular lesions can be associated with complement system abnormalities.
- Distinguishing primary complement defects from secondary changes is crucial for understanding disease pathogenesis.
- The role of complement system abnormalities in the prognosis of glomerular diseases requires further investigation.
Purpose of the Study:
- To investigate the relationship between complement component levels and glomerular lesions.
- To determine if primary complement defects influence disease prognosis.
- To explore the utility of complement component profiling in classifying glomerular histopathology.
Main Methods:
- Sequential measurement of complement components in 127 patients with glomerular lesions over 5 years.
- Analysis of complement levels during active disease and remission phases.
- Discriminant analysis of complement component levels to identify patterns and prognostic significance.
Main Results:
- Persistent complement defects were observed in 17 patients without C3 nephritic factor, suggesting a primary predisposition to glomerular lesions.
- In 12 other patients, complement levels normalized during remission, indicating secondary changes.
- Discriminant analysis revealed that specific patterns of circulating complement components could distinguish histological subgroups and had prognostic value.
Conclusions:
- Primary complement system abnormalities may predispose individuals to glomerular lesions, though they may not affect prognosis.
- Complement level dynamics during disease and remission can differentiate primary defects from secondary changes.
- Computer-assisted analysis of complement component patterns offers valuable insights into glomerular disease classification and prognosis.
Abstract:
Over a 5-year period we have performed sequential measurements of a range of complement components in 127 patients. Each had a well-characterised glomerular lesion and there was no evidence of an underlying connective tissue disorder. In 17 patients with varied histopathology, who did not have C3 nephritic factor, there was a persisting complement defect which was present during remission in the patients we were able to study. The finding of such defects is consistent with the thesis that primary complement system abnormalities predispose to the development of glomerular lesions. Interestingly, these abnormalities did not influence the prognosis of our patients. In 12 other cases without C3 nephritic factor, complement levels were below the normal range when the glomerular lesion was active but returned to it in remission; these were secondary changes. We showed by discriminant analysis that some circulating complement component levels, assessed in relation to each other and without reference to a statistically derived 'normal' range, discriminated between histological subgroups and had prognostic significance as well. These patterns could not be distinguished until the data were stored and analysed by computer.
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