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Erythrocyte-derived mitochondria: an unexpected interferon inducer in lupus
1Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA.
Trends in Immunology
|November 12, 2021
Summary
Systemic lupus erythematosus (SLE) pathogenesis involves type 1 interferon (IFN). Lupus erythrocytes retaining mitochondria, when eaten by macrophages, become a new source of IFN, advancing SLE research.
Area of Science:
- Immunology
- Cell Biology
- Rheumatology
Background:
- Type 1 interferon (IFN) critically contributes to systemic lupus erythematosus (SLE) pathogenesis.
- Understanding novel sources of IFN in SLE is crucial for developing targeted therapies.
Purpose of the Study:
- To identify a novel source of type 1 interferon (IFN) in patients with systemic lupus erythematosus (SLE).
- To investigate the role of erythrocyte mitochondrial content in SLE pathogenesis.
Main Methods:
- Analysis of erythrocyte differentiation in SLE patients.
- Assessment of mitochondrial content in erythrocytes.
- Evaluation of IFN production by macrophages upon phagocytosis of erythrocytes.
Main Results:
- Erythrocytes from SLE patients exhibit impaired metabolic switching from glycolysis to oxidative phosphorylation during differentiation.
- These erythrocytes retain their mitochondria.
- Mitochondria-containing erythrocytes serve as a novel source of IFN when phagocytosed by macrophages.
Conclusions:
- Mitochondria-retaining erythrocytes represent a newly identified source of type 1 interferon in SLE.
- This finding offers new insights into the mechanisms driving SLE pathogenesis.
- Targeting these erythrocytes may present a therapeutic strategy for SLE.
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