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Mesangiolysis associated with severe glomerular endocapillary proliferation of CD57 large granular lymphocytes
O Hotta1, S Miyazawa, Y Taguma
1Department of Nephrology, Sendai Shakaihoken Hospital, Japan.
Insights
CD57+ large granular lymphocytes were identified as the cause of kidney damage in a patient with renal failure. These lymphocytes likely induced glomerular endothelial injury, leading to mesangiolysis and microaneurysm formation.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Renal failure can arise from various glomerular pathologies.
- Large granular lymphocytes (LGLs) are a subset of T-cells implicated in immune-mediated diseases.
Observation:
- A 54-year-old male patient presented with renal failure and characteristic diffuse mesangiolysis with severe endocapillary proliferation on renal biopsy.
- Immunohistochemistry revealed a predominance of CD3-CD56-CD57+ large granular lymphocytes within the glomerular tufts.
Findings:
- The study identified CD57+ large granular lymphocytes as the primary cellular component within the glomeruli.
- Increased expression of Intercellular Adhesion Molecule-1 (ICAM-1) was observed on glomerular endothelial cells, particularly in areas of severe endocapillary proliferation.
Implications:
- These findings suggest a novel mechanism of glomerular injury mediated by CD57+ LGLs.
- A cell-mediated cytolytic pathway involving these lymphocytes is proposed to cause endothelial damage, leading to mesangiolysis and microaneurysm formation.
- This highlights a potential role for LGLs in the pathogenesis of specific renal diseases.
Abstract:
A 54-year-old man developed renal failure, with renal biopsy findings of diffuse mesangiolysis with severe endocapillary proliferation. Immunohistochemical studies revealed that CD3-CD56-CD57+ large granular lymphocytes were present predominantly within glomerular tufts. Intercellular adhesion molecule-1 was more preferentially expressed in the glomerular endothelial cells with severe endocapillary proliferation as compared to those without endocapillary proliferation. These findings suggest that CD57+ large granular lymphocytes caused glomerular endothelial injury by a cell-mediated cytolytic mechanism, resulting in the development of mesangiolysis and microaneurysm formation.
