Flow cytometry model for the detection of neutralizing antibodies against of IFN-β

Juan Carlos Villa-Camacho, Juan Camilo Vargas-Zambrano, John Mario González, .

Keywords: Antibodies, neutralizing, K562 cells, flow cytometry, multiple sclerosis, interferon-beta.

Abstract

Introduction. Interferon beta (IFN-β) is a treatment for relapsing remitting multiple sclerosis. However, the therapeutic use of recombinant proteins induces a humoral immunologic response resulting in the induction of binding (BAb) or neutralizing (NAb) antibodies against the biological product. The presence of neutralizing antibodies has been associated with decreased IFN-β treatment efficacy.

Materials and methods. Two tumor cell lines (K562 and U937) were cultivated with human recombinant IFN-β1a at different concentrations and lengths of time in order to measure the expression of intracellular ISG15, an inducible molecule in the IFN-β1a signaling cascade. Blood was obtained from non-immunized and IFN-β1a immunized (100,000 IU) New Zealand rabbits. The presence of BAbwas evaluated by ELISA. For NAb detection, sera 1:20 dilution were added to the IFN-β1a-stimulated cell lines, and ISG15 expression was evaluated by flow cytometry.

Results. K562 cells provided the better cell line for the assay, stimulated with a dose of 1,000 IU ofIFN-β1a, and a 1:100 dilution for the primary antibody and a 1:200 dilution for the secondary antibody. ISG15 expression was compared between cells alone or cultivated with IFN-β1a. Mean fluorescence intensity (MFI) for ISG-15 expression median was 198 arbitrary units (AU) with interquartile ranges of173-231 AU for non-stimulated cells and 430 AU with interquartile ranges of 316-611.5 AU for IFN-β1a stimulated cells (p<0.01). Immunized rabbit sera decreased the expression of ISG-15 in K562 cells stimulated with IFN-β1a, whereas non-immunized rabbit sera did not.

Conclusions. This rabbit model demonstrates that ISG15 expression evaluated with flow cytometry can be used as a detection assay for NAb.

 

doi: http://dx.doi.org/10.7705/biomedica.v32i4.637

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  • Juan Carlos Villa-Camacho Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, D.C., Colombia
  • Juan Camilo Vargas-Zambrano Grupo de Ciencias Básicas Médicas, Facultad de Medicina, Universidad de los Andes, Bogotá, D.C., Colombia
  • John Mario González Universidad de los Andes, Bogotá, D.C., Colombia

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How to Cite
1.
Villa-Camacho JC, Vargas-Zambrano JC, González JM. Flow cytometry model for the detection of neutralizing antibodies against of IFN-β. biomedica [Internet]. 2012 Dec. 1 [cited 2024 May 11];32(4):617-22. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/637

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Published
2012-12-01
Section
Technical note

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