Autoantibody profiling of patients with primary biliary cirrhosis using a multiplexed line-blot assay

Danilo Villalta, Maria Concetta Sorrentino, Elia Girolami, Marilina Tampoia, Maria Grazia Alessio, Ignazio Brusca, Massimo Daves, Brunetta Porcelli, Giuseppina Barberio, Nicola Bizzaro

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To evaluate the autoantibody profile in patients with primary biliary cirrhosis (PBC) using a new multiplexed line-blot assay specifically designed for the diagnosis of autoimmune liver diseases. Methods: Sera of 58 consecutive PBC patients and 191 disease controls (144 with autoimmune liver diseases other than PBC, and 67 with non-autoimmune chronic liver diseases) were tested by both the multiplexed line-blot Autoimmune Liver Disease Profile 2 (ALD2) and by IIF on HEp-2 cells and on rat kidney/liver/stomach tissues. ALD2 contains the following PBC-associated antigens: AMA-M2, natively purified from bovine heart; M2-E3, a recombinant fusion protein including the E2 subunits of PDC, BCOADC and OGDC; sp100, PML and gp210 recombinant proteins. Results: With the ALD2 assay, a positive reaction to AMA-M2, M2-E3, sp100, PML and gp210 in PBC patients was observed in 77.6%, 84.5%, 34.5%, 15.1% and 18.9%, respectively, of the PBC sera. The overall sensitivity and specificity for PBC were 98.3% and 93.7%. Using IIF, positivity rates to AMA, and to antinuclear autoantibodies with membranous/rim-like and multiple nuclear dot patterns were 86.2%, 8.6% and 22.4%, respectively. The overall sensitivity and specificity for PBC of the IIF method were 86.2% and 97.9%, respectively. Conclusions: The ALD2 line-blot showed a good diagnostic accuracy for PBC and a higher sensitivity than the IIF method to detect sp100 and gp210 autoantibodies.

Original languageEnglish
Pages (from-to)135-138
Number of pages4
JournalClinica Chimica Acta
Volume438
DOIs
Publication statusPublished - Jan 1 2015

Keywords

  • Anti-mitochondrial autoantibodies (AMA)
  • Autoantibodies
  • Gp210
  • Membranous/rim-like
  • Multiple nuclear dots (MND)
  • Sp100

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical
  • Medicine(all)

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