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Late expression of tumor necrosis factor-alpha is markedly depressed in patients with IgA nephropathy
R L Bull1, B A Julian, S Jackson
1Department of Microbiology, University of Alabama at Birmingham, 35294, USA.
Abstract:
In this study we demonstrate that peripheral blood mononuclear cells (PBMC) of patients with IgA nephropathy (IgAN) express mRNA for tumor necrosis factor alpha (TNF-alpha) at a significantly lower frequency after stimulation for 24 hours with pokeweed mitogen than do PBMC of a control population. These differences were not seen in patient samples stimulated for only 3 hours. To identify the cells responsible for TNF-alpha expression after overnight mitogen stimulation, we performed reverse transcriptase polymerase chain reaction analysis after preparative flow cytometry of PBMC labelled with fluorescent monoclonal antibodies. After stimulation for 24 hours, PBMC of all patients tested displayed no detectable TNF-alpha mRNA; in the control PBMC, TNF-alpha mRNA was present in CD4+ and CD8+ T cells, as well as in CD19+ B cells in some samples. These results suggest that diminished expression of TNF-alpha by T cells may play a role in the pathogenesis of IgAN.
Insights
Peripheral blood mononuclear cells in IgA nephropathy patients show reduced tumor necrosis factor alpha (TNF-alpha) mRNA expression. This suggests a potential role for diminished T cell TNF-alpha in IgA nephropathy pathogenesis.
Area of Science:
- Immunology
- Nephrology
Background:
- IgA nephropathy (IgAN) is a primary glomerulonephritis.
- Tumor necrosis factor alpha (TNF-alpha) is a pro-inflammatory cytokine implicated in various immune responses.
Purpose of the Study:
- To investigate differences in TNF-alpha mRNA expression in peripheral blood mononuclear cells (PBMC) between IgA nephropathy patients and healthy controls.
- To identify specific cell types responsible for TNF-alpha production in IgAN.
Main Methods:
- PBMC from IgAN patients and controls were stimulated with pokeweed mitogen for 3 and 24 hours.
- Reverse transcriptase polymerase chain reaction (RT-PCR) and flow cytometry were used to analyze TNF-alpha mRNA expression in specific cell populations (CD4+, CD8+ T cells, CD19+ B cells).
Main Results:
- IgAN patient PBMC showed significantly lower TNF-alpha mRNA frequency after 24-hour stimulation compared to controls.
- No significant differences were observed after 3-hour stimulation.
- In controls, TNF-alpha mRNA was detected in CD4+ T cells, CD8+ T cells, and some CD19+ B cells after 24-hour stimulation, but was undetectable in IgAN patient PBMC.
Conclusions:
- Diminished TNF-alpha expression by T cells may contribute to the pathogenesis of IgA nephropathy.
- Further research is warranted to elucidate the precise role of TNF-alpha in IgAN.