{"doi":"10.1093/jimmun/vkaf124","title":"The complement regulator CD55 modulates TLR9 signaling and supports survival in marginal zone B cells","abstract":"Marginal zone (MZ) B cells bridge innate and adaptive immunity by sensing bloodborne antigens and producing rapid antibody and cytokine responses. When unregulated, MZ B cells are associated with autoimmunity. CD55 is a membrane-bound complement regulator that interferes with complement activation and is another important component of innate and adaptive immunity. MZ B cells express low CD55 in both mice and humans, but the role of CD55 in MZ B cell function is unknown. Using germline knockout (KO) mice, we found that similar numbers of MZ B cells were initially established in 3-wk-old CD55-deficient mice compared with wild-type mice. However, MZ B cells failed to accumulate as mice aged and underwent increased apoptosis independent of alternative complement activation. Following ex vivo stimulation of MZ B cells through TLR9 (Toll-like receptor 9), we observed increased interleukin-6 expression in CD55 KO MZ B cells. In addition, CD55 KO mice exhibited reduced total IgG response following in vivo administration of TLR9 agonist. These findings provide new insights into the role of CD55 in MZ B cell survival and B cell function.","journal":"The Journal of Immunology","year":2025,"id":526093,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":3,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9515,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2025-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":679689,"name":"Xi Wang","orcid":"0000-0002-7936-9366","position":1,"is_corresponding":false},{"id":1341774,"name":"Ivana Ling","orcid":null,"position":2,"is_corresponding":false},{"id":646320,"name":"Sonam Verma","orcid":"0000-0002-9894-5058","position":3,"is_corresponding":false},{"id":1401594,"name":"Cassaundra Eck","orcid":null,"position":4,"is_corresponding":false},{"id":894432,"name":"Wumei Blanche","orcid":null,"position":5,"is_corresponding":false},{"id":245890,"name":"Christine T. N. Pham","orcid":"0000-0003-1127-3699","position":6,"is_corresponding":false},{"id":280632,"name":"Peggy L. Kendall","orcid":"0000-0002-0516-654X","position":7,"is_corresponding":false},{"id":1134859,"name":"Iris Lee","orcid":"0000-0002-6064-2158","position":0,"is_corresponding":true}],"reference_count":57,"raw_metadata":null,"created_at":"2026-07-19T02:50:25.860105Z","pmid":"40570142","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}