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Membranoproliferative glomerulonephritis in the aged and its possible causal relationship with CD8+CD57+ lymphocytes
Abstract:
Membranoproliferative glomerulonephritis (MPGN) is a chronic progressive glomerulonephritis that occurs primarily in patients under the age of 30, and is rare in the elderly. We report eight aged patients with MPGN associated with CD8+CD57+ lymphocytosis. All eight patients showed a significant increase in CD8+CD57+ lymphocytes with a significant decrease in the ratio of CD4+ cells to CD8+ cells. Infiltration of CD8+CD57+ lymphocytes was observed within capillary lumens to various degrees according to the severity of endocapillary proliferation in each case. Expression of endothelial-leukocyte adhesion molecule-1 was observed in a focal and segmental manner on glomerular endothelial cells and on the endothelium of arterioles and arteries in kidney tissue in four cases in which a pronounced endocapillary proliferation was simultaneously seen. These findings suggest that cell-mediated cytotoxic mechanisms against glomerular endothelial cells may be involved in the pathogenesis of MPGN in the aged.
Insights
Membranoproliferative glomerulonephritis (MPGN) in the elderly is linked to increased CD8+CD57+ lymphocytes. This suggests cell-mediated cytotoxic mechanisms may drive MPGN pathogenesis in aged individuals.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Membranoproliferative glomerulonephritis (MPGN) is typically a disease of young adults, rarely affecting the elderly.
- The pathogenesis of MPGN in aged individuals remains incompletely understood.
Purpose of the Study:
- To investigate the association between MPGN and specific lymphocyte populations in elderly patients.
- To explore potential mechanisms involved in MPGN development in the aged population.
Main Methods:
- Analysis of eight elderly patients diagnosed with MPGN.
- Flow cytometry to assess CD4+ and CD8+ T-cell populations, specifically CD8+CD57+ lymphocytes.
- Kidney biopsy examination for lymphocyte infiltration and expression of endothelial-leukocyte adhesion molecule-1 (ELAM-1).
Main Results:
- All eight aged MPGN patients exhibited elevated CD8+CD57+ lymphocytes and a decreased CD4+/CD8+ ratio.
- CD8+CD57+ lymphocyte infiltration was observed in glomerular capillaries, correlating with endocapillary proliferation severity.
- ELAM-1 expression was noted on glomerular and vascular endothelium in cases with significant endocapillary proliferation.
Conclusions:
- MPGN in the elderly is associated with a distinct CD8+CD57+ lymphocytosis.
- Cell-mediated cytotoxic mechanisms targeting glomerular endothelial cells may play a role in the pathogenesis of MPGN in aged patients.