A method to differentiate between anti-C1q antibodies and C1q-binding immune complexes using collagenase-digested solid phase C1q

Johannes E. MenzelOthmar ScherakGernot KolarzFritz GamerithUriwan YoungchaiyudMedizinische Universitat Wien, Instituts fur ImmunologieLudwig Boltzmann InstituteMahidol University2018-08-102018-08-101991-04-25Journal of Immunological Methods. Vol.138, No.2 (1991), 165-171002217592-s2.0-0025780219https://repository.li.mahidol.ac.th/handle/20.500.14594/21989A method for the detection of circulating immune complexes in the presence of autoantibodies to C1q is described. Solid phase C1q-digestion with bacterial collagenase results in the elimination of the collagen-like region of C1q. Binding of model immune complexes to this modified solid phase C1q is practically unaltered, while reactivity of anti-C1q antibodies is abolished by this procedure. In conjunction with an ELISA using the collagen-like region of C1q as antigen this modified C1q solid phase assay may be used to determine immune complexes and anti-C1q antibodies in the sera of patients with autoimmune rheumatic diseases. © 1991.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyImmunology and MicrobiologyA method to differentiate between anti-C1q antibodies and C1q-binding immune complexes using collagenase-digested solid phase C1qArticleSCOPUS10.1016/0022-1759(91)90164-B