Complement system protein C4 and susceptibility to hydralazine-induced systemic lupus erythematosus
- PMID: 2565418
- DOI: 10.1016/s0140-6736(89)92506-3
Complement system protein C4 and susceptibility to hydralazine-induced systemic lupus erythematosus
Abstract
21 patients with systemic lupus erythematosus induced by long-term treatment with hydralazine were investigated to see whether susceptibility to this syndrome was associated with deficiency of the classical pathway complement protein, C4. 16 of 21 (76%) patients had one or more C4 null (ie, non-productive) alleles compared with 35 of 82 normal subjects (43%). This difference was significant. The HLA-DR4 antigen, known to be in linkage disequilibrium with the C4B null allele, was also significantly more frequent in the patients (14 of 21 patients compared with 31 of 81 normal subjects). Susceptibility to hydralazine-induced lupus, as in idiopathic systemic lupus erythematosus, may depend partly upon genetically determined C4 levels.
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