DISTINCT CELL-BOUND COMPLEMENT ACTIVATION PRODUCTS ASSOCIATE WITH DISEASE ACTIVITY AND IMMUNE TRANSCRIPTIONAL SIGNATURES IN SLE
Bibliographic record
Abstract
PV116 / #181 Poster Topic: AS14 - Innate Immunity Background/Purpose Complement plays a central role in SLE, generating an array of bioactive soluble and cell-bound complement activation products (CB-CAPs) during disease activity. Data are lacking though detailing the types, quantities, and impacts of the numerous CB-CAP on SLE immune cells, especially with respect to disease activity. We applied a mass cytometry (MC) panel that can detect over 20 CB-CAPs and complement receptors to PBMCs from paired flare and remission samples from 6 patients with classified SLE. Furthermore, we analyzed single-cell transcriptional profiles on flaring samples using antibodies to the most prevalent CB-CAPs using cellular indexing of transcriptomes and epitopes (CITE)-seq. Methods Adults with ACR- or SLICC-classified SLE were consented for PBMC collection at Washington University School of Medicine. Isolated PBMCs were subjected to single-cell MC (n = 6) and CITE-seq (n = 3). MC data analysis was performed with Cytobank. CITE-seq data analyses was performed with Seuret, gProfileR, and Comprehensive Multi-omics Platform for Biological InterpretatiOn (COMPBIO). Results We found the highest frequency of C4d, C3d, C5, and Bb deposition on B cells compared to T cells and monocytes during SLE flares (Figure 1). During disease remission, low levels of all CB-CAPs were observed in these cells. Compared to controls, transitional B cells from flaring patients with SLE had high levels of C5 and Bb with little C4d or C3d. CD11c + B cells from flaring patients also had elevated Bb deposition compared to controls. CITE-seq transcriptional profiling identified Bb- and C3d-bearing CD11c + B cells possessing a type I interferon signature, with Bb-bearing B cells further possessing a TNF/NF-κB transcriptional signature (Figure 2). Figure 1. Figure 2. Conclusions A high level of CB-CAP deposition was observed in B cells obtained from flaring subjects with a SLE, which was absent during disease remission. The types of CB-CAPs found on PBMCs were not uniform between cell types, potentially opening a previously undescribed heterogeneity in SLE. Additional heterogeneity was observed in the transcriptional profiles associated with specific CB-CAPs on B cells. These pilot data demonstrate the feasibility of the MC complement panel on human samples, and the potential insights CITE-seq has using CB-CAPs in discovering novel mechanisms of complement activation and regulation.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".