Quantitation of C4 nephritic factor by an enzyme-linked immunosorbent assay

Jin Seino, Yasumichi Kinoshita, Katsuhiko Sudo, Ikuo Horigome, Hiroshi Sato, Mitsuyoshi Narita, Hiroo Noshiro, Kenichi Kudo, Kazuo Fukuda, Takao Saito, Kaoru Yoshinaga

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We have developed an enzyme-linked immunosorbent assay (ELISA) for the quantitation of C4 nephritic factor (C4NeF). Incubation of the C4NeF-positive serum from patient M.I. with normal human serum (NHS) in the presence of human aggregated IgG (AHG) resulted in the formation of stable C4-C2 complex. No complex was formed in EDTA or under the condition free of AHG. The reaction mixture was filtered through an ACA 22 column, from which the C4-C2 complex was eluted at the first protein peak. When IgG purified from M.I. serum was incubated with NHS and AHG, C4-C2 complex also increased in proportion to dose of the purified M.I. IgG. These results show that C4NeF in M.I. serum stabilizes C4b2a convertase of the classical complement pathway, and is quantified by the ELISA. C4NeF activity was measured, using the ELISA method, in patients with various glomerular diseases, and found elevated in three of 24 patients with membranoproliferative glomerulonephritis (MPGN) type I and slightly but distinctly positive in seven of 24. No C4NeF was detected in two C3 nephritic factor-positive patients with MPGN type II and six with active systemic lupus erythematosus. The new method was more simple and quantitative than C4b2a stabilization assay for C4NeF.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalJournal of Immunological Methods
Volume128
Issue number1
DOIs
Publication statusPublished - 1990

Keywords

  • C3 nephritic factor
  • C4 nephritic factor
  • C42a stabilization
  • ELISA
  • Membranoproliferative glomerulonephritis

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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