Structural Characterization and Immunogenicity in Wild-Type and Immune Tolerant Mice of Degraded Recombinant Human Interferon Alpha2b (original) (raw)

Purpose

This study was conducted to study the influence of protein structure on the immunogenicity in wild-type and immune tolerant mice of well-characterized degradation products of recombinant human interferon alpha2b (rhIFNα2b).

Methods

RhIFNα2b was degraded by metal-catalyzed oxidation (M), cross-linking with glutaraldehyde (G), oxidation with hydrogen peroxide (H), and incubation in a boiling water bath (B). The products were characterized with UV absorption, circular dichroism and fluorescence spectroscopy, gel permeation chromatography, reverse-phase high-pressure liquid chromatography, sodium dodecyl sulfate polyacrylamide gel electrophoresis, Western blotting, and mass spectrometry. The immunogenicity of the products was evaluated in wild-type mice and in transgenic mice immune tolerant for hIFNα2. Serum antibodies were detected by enzyme-linked immunosorbent assay or surface plasmon resonance.

Results

M-rhIFNα2b contained covalently aggregated rhIFNα2b with three methionines partly oxidized to methionine sulfoxides. G-rhIFNα2b contained covalent aggregates and did not show changes in secondary structure. H-rhIFNα2b was only chemically changed with four partly oxidized methionines. B-rhIFNα2b was largely unfolded and heavily aggregated. Nontreated (N) rhIFNα2b was immunogenic in the wild-type mice but not in the transgenic mice, showing that the latter were immune tolerant for rhIFNα2b. The anti-rhIFNα2b antibody levels in the wild-type mice depended on the degradation product: M-rhIFNα2b > H-rhIFNα2b ∼ N-rhIFNα2b ≫ B-rhIFNα2b; G-rhIFNα2b did not induce anti-rhIFNα2b antibodies. In the transgenic mice, only M-rhIFNα2b could break the immune tolerance.

Conclusions

RhIFNα2b immunogenicity is related to its structural integrity. Moreover, the immunogenicity of aggregated rhIFNα2b depends on the structure and orientation of the constituent protein molecules and/or on the aggregate size.

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Abbreviations

ABTS:

2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)

BSA:

bovine serum albumin

CD:

circular dichroism

DLS:

dynamic light scattering

DTT:

dithiothreitol

ELISA:

enzyme-linked immunosorbent assay

ESI-ToF:

electrospray ionization-time of flight

GPC:

gel permeation chromatography

hIFNα2:

human interferon alpha2

i.p.:

intraperitoneally

MALDI-ToF/ToF:

matrix-assisted laser desorption ionization time of flight/time of flight

PAGE:

polyacrylamide gel electrophoresis

PB:

sodium phosphate buffer, pH 7.2

PBS:

phosphate-buffered saline

rhIFNα2b:

recombinant human interferon alpha2b

RP-HPLC:

reverse-phase high-pressure liquid chromatography

s.c.:

subcutaneously

SDS:

sodium dodecyl sulfate

SPR:

surface plasmon resonance

TFA:

trifluoroacetic acid

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Acknowledgments

The authors wish to thank Dr. Viscomi and Lucia Scapol for supplying the rhIFNα2b solutions, the standard anti-rhIFNα2b serum, and for valuable discussions. Dr. Pestka is kindly thanked for supplying the transgenic immune tolerant mice. Janny Westdijk is kindly acknowledged for her help with the Biacore experiments and valuable discussions. We thank Ronald van Ooijen and Georgina Gal for performing the mass spectrometric analyses. This work was financially supported by the European Union through the 5th Framework Program “Competitive and Sustainable Growth,” LYOPRO project (Contract no. G1RD-CT2002-00736).

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Authors and Affiliations

  1. Central Laboratory Animal Institute, Utrecht University, Utrecht, The Netherlands
    Suzanne Hermeling & Huub Schellekens
  2. Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), P.O. Box 80082, 3508 TB, Utrecht, The Netherlands
    Suzanne Hermeling, Liliana Aranha, Daan J. A. Crommelin & Wim Jiskoot
  3. Department of Biomolecular Mass Spectrometry, Utrecht Institute for Pharmaceutical Sciences (UIPS) and Bijvoet Center for Biomolecular Research, Utrecht, The Netherlands
    J. Mirjam A. Damen & Monique Slijper

Authors

  1. Suzanne Hermeling
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  2. Liliana Aranha
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  3. J. Mirjam A. Damen
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  4. Monique Slijper
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  5. Huub Schellekens
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  6. Daan J. A. Crommelin
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  7. Wim Jiskoot
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Correspondence toSuzanne Hermeling.

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Hermeling, S., Aranha, L., Damen, J.M.A. et al. Structural Characterization and Immunogenicity in Wild-Type and Immune Tolerant Mice of Degraded Recombinant Human Interferon Alpha2b.Pharm Res 22, 1997–2006 (2005). https://doi.org/10.1007/s11095-005-8177-9

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