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Immunoglobulin glycation with fructose: a comparative study.

Deeba S Jairajpuri1, Shamila Fatima, M Saleemuddin

  • 1Department of Biochemistry, Aligarh Muslim University, Aligarh 202002, India.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|December 19, 2006
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Summary

Immunoglobulins from various animals show structural changes when exposed to fructose, impacting their antigen-binding ability. Goat IgG is most resistant, while hen IgY is most susceptible to these glycation effects.

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Area of Science:

  • Biochemistry
  • Immunology
  • Protein Chemistry

Background:

  • Non-enzymatic glycation of immunoglobulins by sugars occurs in vivo and in vitro.
  • Previous studies show conflicting results on glycation's effect on antibody-antigen binding.
  • Antibodies may encounter high sugar concentrations during preservation processes like freeze-drying.

Purpose of the Study:

  • To investigate the structural alterations in immunoglobulins from different animal species upon in vitro glycation with fructose.
  • To assess the impact of fructose-induced glycation on the antigen-binding capacity of antibodies.
  • To evaluate the protective effects of DETAPAC and EDTA against glycation-induced modifications.

Main Methods:

  • In vitro glycation of IgG (goat, human, rabbit, mouse, buffalo) and IgY (hen) with fructose.
  • Analysis of glycated immunoglobulins using SDS-PAGE, UV-Vis spectrophotometry (280 nm hyperchromicity), and fluorescence spectroscopy.
  • Assessment of antibody-antigen binding using immunodiffusion and ELISA.

Main Results:

  • Significant variations in susceptibility to fructose glycation were observed across different animal immunoglobulin types.
  • Incubation with fructose led to a rapid loss of binding ability in anti-glucoseoxidase (GOD) antibodies.
  • DETAPAC and EDTA demonstrated protective effects, significantly reducing fructose-induced alterations but not completely preventing them.

Conclusions:

  • Immunoglobulins from goat, human, rabbit, mouse, buffalo, and hen undergo significant structural changes upon fructose incubation.
  • Susceptibility to glycation varied, with goat IgG being most resistant and hen IgY most susceptible.
  • DETAPAC and EDTA effectively mitigated fructose-induced glycation damage to immunoglobulins.