{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T14:18:17Z","timestamp":1790864297458,"version":"4.1.0"},"reference-count":69,"publisher":"Rockefeller University Press","issue":"9","content-domain":{"domain":["rupress.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2000,11,6]]},"abstract":"<jats:p>The complement system enhances antibody responses to T-dependent antigens, but paradoxically, deficiencies in C1 and C4 are strongly linked to autoantibody production in humans. In mice, disruption of the C1qa gene also results in spontaneous autoimmunity. Moreover, deficiencies in C4 or complement receptors 1 and 2 (CR1\/CR2) lead to reduced selection against autoreactive B cells and impaired humoral responses. These observations suggest that C1 and C4 act through CR1\/CR2 to enhance humoral immunity and somehow suppress autoimmunity. Here we report high titers of spontaneous antinuclear antibody (ANA) in C4\u2212\/\u2212 mice. This systemic lupus erythematosus\u2013like autoimmunity is highly penetrant; by 10 mo of age, all C4\u2212\/\u2212 females and most males produced ANA. In contrast, titers and frequencies of ANA in Cr2\u2212\/\u2212 mice, which are deficient in CR1 and CR2, never rose significantly above those in normal controls. Glomerular deposition of immune complexes (ICs), glomerulonephritis, and splenomegaly were observed in C4\u2212\/\u2212 but not Cr2\u2212\/\u2212 mice. C4\u2212\/\u2212, but not Cr2\u2212\/\u2212, mice accumulate activated T and B cells. Clearance of circulating ICs is impaired in preautoimmune C4\u2212\/\u2212, but not Cr2\u2212\/\u2212, mice. C4 deficiency causes spontaneous, lupus-like autoimmunity through a mechanism that is independent of CR1\/CR2.<\/jats:p>","DOI":"10.1084\/jem.192.9.1339","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T16:48:33Z","timestamp":1027702113000},"page":"1339-1352","update-policy":"https:\/\/doi.org\/10.1084\/jem.crossmarkpolicy","source":"Crossref","is-referenced-by-count":121,"title":["Complement C4 Inhibits Systemic Autoimmunity through a Mechanism Independent of Complement Receptors Cr1 and Cr2"],"prefix":"10.1084","volume":"192","author":[{"given":"Zhibin","family":"Chen","sequence":"first","affiliation":[{"name":"aDepartment of Immunology, Duke University Medical Center, Durham, North Carolina 27710"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergei B.","family":"Koralov","sequence":"additional","affiliation":[{"name":"aDepartment of Immunology, Duke University Medical Center, Durham, North Carolina 27710"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Garnett","family":"Kelsoe","sequence":"additional","affiliation":[{"name":"aDepartment of Immunology, Duke University Medical Center, Durham, North Carolina 27710"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"291","published-online":{"date-parts":[[2000,11,6]]},"reference":[{"key":"2023072509374188400_R1","doi-asserted-by":"crossref","first-page":"917","DOI":"10.1016\/S0952-7915(05)80014-7","article-title":"Systemic lupus erythematosus","volume":"3","author":"Pisetsky","year":"1991","journal-title":"Curr. 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