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Related Experiment Videos

Common antigenicity for two glycosidases.

Revecca Kakavanos1, Pierre Lehn, Isabelle Callebaut

  • 1Lysosomal Diseases Research Unit, Department of Genetic Medicine, Children Youth and Women's Health Service, 72 King William Road, North Adelaide, Adelaide, SA 5006, Australia.

FEBS Letters
|December 20, 2005
PubMed
Summary

Enzyme replacement therapy (ERT) can cause immune responses. This study found that related enzymes, like alpha-glucosidase and alpha-L-iduronidase, share similar structures, potentially explaining cross-reactive immune responses in lysosomal storage disorder patients.

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Area of Science:

  • Biochemistry
  • Immunology
  • Genetics

Background:

  • Enzyme replacement therapy (ERT) is crucial for treating lysosomal storage disorders (LSDs).
  • Immune responses to therapeutic enzymes can complicate ERT efficacy.
  • Understanding enzyme antigenicity is vital for improving treatment outcomes.

Purpose of the Study:

  • To investigate the antigenicity of alpha-glucosidase and alpha-L-iduronidase.
  • To identify potential cross-reactive epitopes between these two glycosidases.
  • To explore the implications for immune responses during ERT in LSD patients.

Main Methods:

  • Generated and purified polyclonal antibodies against recombinant human alpha-glucosidase and alpha-L-iduronidase.
  • Assessed linear sequence epitope reactivity of antibodies to both enzymes.

Related Experiment Videos

  • Utilized a monoclonal antibody targeting the alpha-glucosidase active site to probe for cross-reactivity.

    • Main Results:

    • Polyclonal antibodies showed cross-reactivity between alpha-glucosidase and alpha-L-iduronidase.
    • A monoclonal antibody to the alpha-glucosidase active site cross-reacted with a structural element in the alpha-L-iduronidase active site.
    • This cross-reactive site on alpha-L-iduronidase was previously found to be highly antigenic in MPS I patients.

    Conclusions:

    • Glycosidases can possess shared, cross-reactive epitopes.
    • Common structural elements, particularly within active sites, may underlie these cross-reactivities.
    • This finding has implications for managing immune responses in patients undergoing ERT for LSDs.