Complement membrane attack complexes assemble NLRP3 inflammasomes triggering IL-1 activation of IFN-γ–primed human endothelium
Open accessAbstract
Rationale: Complement activation contributes to multiple immune-mediated pathologies. In late allograft failure, donor-specific antibody deposits complement membrane attack complexes (MAC) on graft endothelial cells (ECs), substantially increasing their immunogenicity without causing lysis. Internalized MAC stabilize NIK (NF-κB [nuclear factor kappa-light-chain-enhancer of activated B cells]–inducing kinase) protein on Rab5+MAC+ endosomes, activating noncanonical NF-κB signaling. However, the link to increased immunogenicity is unclear. Objective: To identify mechanisms by which alloantibody and internalized MAC activate ECs to enhance their ability to increase T-cell responses. Methods and Results: In human EC cultures, internalized MAC also causes NLRP3 (NOD-like receptor family pyrin domain containing 3) translocation from endoplasmic reticulum to Rab5+MAC+NIK+ endosomes followed by endosomal NIK-dependent inflammasome assembly. Cytosolic NIK, stabilized by LIGHT (lymphotoxin-like inducible protein that competes with glycoprotein D for herpesvirus entry on T cells), does not trigger inflammasome assembly, and ATP-triggered inflammasome assembly does not require NIK. IFN-γ (interferon-γ) primes EC responsiveness to MAC by increasing NLRP3, pro-caspase 1, and gasdermin D expression. NIK-activated noncanonical NF-κB signaling induces pro-IL (interleukin)-1β expression. Inflammasome processed pro-IL-1β, and gasdermin D results in IL-1β secretion that increases EC immunogenicity through IL-1 receptor signaling. Activation of human ECs lining human coronary artery grafts in immunodeficient mouse hosts by alloantibody and complement similarly depends on assembly of an NLRP3 inflammasome. Finally, in renal allograft biopsies showing chronic rejection, caspase-1 is activated in C4d + ECs of interstitial microvessels, supporting the relevance of the cell culture findings. Conclusions: In response to antibody-mediated complement activation, IFN-γ-primed human ECs internalize MAC, triggering both endosomal-associated NIK-dependent NLRP3 inflammasome assembly and IL-1 synthesis, resulting in autocrine/paracrine IL-1β-mediated increases in EC immunogenicity. Similar responses may underlie other complement-mediated pathologies.
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MAC recruits and activates leukocytes by coordinating inflammasome activation and endothelial cytokine signalling.
“It has also been shown that MAC recruits and activates leukocytes by coordinating inflammasome activation and endothelial cytokine signalling [196,197,198,199,200]”
From Bruch’s Membrane: A Key Consideration with Complement-Based Therapies for Age-Related Macular Degeneration (2023) · cites this paper as [197]
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- Authors
- Xie, C. B., Qin, L., Li, G., Fang, C., Kirkiles-Smith, N. C., Tellides, G., Pober, J. S., & Jane-wit, D.
- Affiliations
- Yale University (US)
- Division of Cardiovascular Medicine (C.F., D.J.-w), Yale University School of Medicine, New Haven, CT.
- Venue
- Circulation Research
- Published
- 2019-06-07
- Volume
- 124
- Issue
- 12
- Pages
- 1747-1759
- ISSN
- 0009-7330 (ISSN-L)
- 1524-4571
- PMC
- PMC6557295
- OpenAlex
- W2940337896
- Cited by
- 89
- References
- 32
- Citations by year
- 2026: 14 · 2025: 10 · 2024: 10 · 2023: 13 · 2022: 16 · 2021: 11 · 2020: 12 · 2019: 3
- FWCI
- 3.48
- Type
- journal article
- Language
- en
- Update notices
- correction (2021-04-15)
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Circulation Research (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute for Health and Care Research
- National Institutes of Health (UL1TR001863)
- National Heart, Lung, and Blood Institute (R00HL125895, R01HL051014, R01HL141137)
- National Institute of General Medical Sciences (T32GM007205)
- National Institute of Allergy and Infectious Diseases (U01AI132895, F30AI138473)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (P30AR053495)
- National Center for Advancing Translational Sciences
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
- Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
- Keywords
- membrane attack complex, NLRP3 inflammasome, NIK, non-canonical NF-κB signaling, alloantibodies, IFN-γ priming, IL-1β secretion, gasdermin D, caspase-1, chronic rejection, donor-specific antibodies
- MeSH terms
- NLR Family, Pyrin Domain-Containing 3 Protein, Adult, Cells, Cultured, Endothelium, Vascular, Female, Humans, Interferon-gamma, Interleukin-1, Male, Complement Membrane Attack Complex, HEK293 Cells, Inflammasomes, Human Umbilical Vein Endothelial Cells
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