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Constitutive HO-1 and CD55 (DAF) Expression and Regulatory Interaction in Cultured Podocytes
Elias A Lianos1,2, Kelsey Wilson1, Katerina Goudevenou3
1Veterans Affairs Health Care System, Salem, VA 24153, USA.
Biomedicines
|December 23, 2023
Summary
Constitutively expressed heme oxygenase-1 (HO-1) and decay-accelerating factor (DAF, CD55) are present in rat podocytes. Heme increases expression of both HO-1 and DAF, suggesting a role in complement regulation.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Heme oxygenase-1 (HO-1) overexpression in vivo increases decay-accelerating factor (DAF, CD55) and reduces complement activation in rat kidneys.
- Podocytes are crucial for kidney filtration and can be affected by complement-mediated injury.
Purpose of the Study:
- To investigate whether constitutively expressed HO-1 regulates CD55 expression in cultured rat podocytes.
- To determine the effect of heme, an HO-1 inducer, on HO-1 and CD55 expression in podocytes.
Main Methods:
- Cultured rat podocytes were used.
- Flow cytometry, quantitative RT-qPCR, and HO-1 gene silencing (RNA interference) were employed.
- Heme was used to induce HO-1 expression.
Main Results:
- Rat podocytes constitutively express both HO-1 and DAF (CD55).
- Heme treatment increased the expression of both HO-1 and DAF in cultured podocytes.
- HO-1 gene silencing via RNA interference showed inconsistent effects on constitutive CD55 transcription.
Conclusions:
- Constitutively expressed HO-1 and DAF are present in rat podocytes.
- Heme can upregulate both HO-1 and DAF in podocytes, suggesting a potential role in regulating complement activation.
- These findings are relevant to conditions involving podocyte heme exposure and complement activation, such as hemolysis.
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