Journal of Gastroenterology

, Volume 47, Issue 2, pp 136–143

Development of a new immunoassay for the accurate determination of anti-infliximab antibodies in inflammatory bowel disease

  • Hirotsugu Imaeda
  • Akira Andoh
  • Yoshihide Fujiyama
Original Article—Alimentary Tract

Abstract

Background

The formation of antibodies to infliximab (ATIs) is closely associated with the loss of response to infliximab in patients with inflammatory bowel disease (IBD). We evaluated the clinical utility of a novel method to measure serum ATI levels in the presence of infliximab.

Methods

ATI levels were measured using a novel immunoassay and the conventional method in 58 patients with Crohn’s disease (CD) under infliximab maintenance therapy. The serum infliximab trough levels were determined by enzyme-linked immunosorbent assay.

Results

ATIs were detected in 16 out of 58 patients (27.6%) by the new method, but the conventional method detected only 2 patients (3.4%) who had the two highest ATI titers assayed by the new method. The presence of ATIs in the samples positive by the new method but negative by the conventional method was confirmed by Western blot analysis. Western blotting analysis also indicated that the new method could restore the binding capacities of the ATIs whose recognition sites were occupied by free infliximab. In the new method, the addition of infliximab to the samples dose-dependently blocked the detection of ATIs. Patients positive for ATIs had significantly lower serum trough levels of infliximab (P < 0.01) and significantly higher clinical activity scores (P < 0.001) as compared with patients negative for ATI.

Conclusions

The new method makes it possible to measure serum ATI levels in the presence of infliximab. This method is useful for deciding the optimal management strategies for IBD patients with loss of response to infliximab.

Keywords

Anti-infliximab antibodies IBD Loss of response 

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Copyright information

© Springer 2011

Authors and Affiliations

  • Hirotsugu Imaeda
    • 1
  • Akira Andoh
    • 2
  • Yoshihide Fujiyama
    • 1
  1. 1.Department of MedicineShiga University of Medical ScienceOtsuJapan
  2. 2.Division of Mucosal ImmunologyGraduate School, Shiga University of Medical ScienceOtsuJapan

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