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Increased mRNA expression encoding for medullasin in peripheral blood mononuclear cells from patients with IgA
T Nakamura1, I Ebihara, S Osada
1Department of Medicine, Juntendo University School of Medicine, Tokyo, Japan.
Abstract:
We investigated mRNA expression for medullasin (an inflammatory serine protease in bone marrow cells) in peripheral blood mononuclear cells (PBMC) obtained from 36 patients with primary IgA nephropathy (IgAN), 30 patients with other types of primary glomerular disease, 18 patients with secondary IgA nephritis including lupus nephritis and hepatic glomerulosclerosis and 24 healthy age-matched controls. The majority of patients with IgAN (86%) showed elevated medullasin expression in PBMC, while no medullasin mRNA expression was detected in PBMC obtained from patients with other types of primary glomerular disease, secondary IgA nephritis or normal healthy controls. A positive correlation was noted between mRNA levels and urinary protein excretion. The medullasin mRNA expression in PBMC also correlated with the severity of the histopathologic changes in renal tissue obtained from patients with IgAN. All the patients with severe proteinuria (more than 3.0 g/day) showed strong [more than (++)] medullasin mRNA expression in their PBMC. In addition, all the patients with more than (++) medullasin mRNA expression are grade III or IV histopathological findings. These studies suggest that abnormally regulated medullasin gene expression in PBMC may be associated with the progression of primary IgAN.
Insights
Elevated medullasin (an inflammatory protease) mRNA expression in peripheral blood mononuclear cells (PBMC) is a key indicator in primary IgA nephropathy (IgAN) patients. This finding correlates with disease severity and urinary protein levels.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Primary IgA nephropathy (IgAN) is a common cause of glomerulonephritis.
- The role of inflammatory mediators like medullasin in IgAN pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate medullasin mRNA expression in peripheral blood mononuclear cells (PBMC) of IgAN patients.
- To determine the correlation between medullasin expression and IgAN clinical and histopathological features.
Main Methods:
- Quantitative mRNA expression analysis of medullasin in PBMC.
- Patient cohorts included primary IgAN, other glomerular diseases, secondary IgA nephritis, and healthy controls.
- Correlation analysis with urinary protein excretion and renal histopathology.
Main Results:
- 86% of primary IgAN patients exhibited elevated medullasin mRNA expression in PBMC.
- No medullasin mRNA expression was detected in control groups or patients with other kidney diseases.
- Medullasin mRNA levels positively correlated with urinary protein excretion and histopathological severity (grades III-IV).
Conclusions:
- Abnormal medullasin gene expression in PBMC is strongly associated with primary IgAN.
- Medullasin may serve as a potential biomarker for IgAN progression and severity.
- Further research into medullasin's role in IgAN pathogenesis is warranted.