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Published on: December 26, 2014
Glycosylation and the immune system.
P M Rudd1, T Elliott, P Cresswell
1The Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK. pmr@glycob.ox.ac.uk
Science (New York, N.Y.)
|March 28, 2001
Summary
Glycoproteins are crucial for both innate and adaptive immunity, playing roles in immune cell interactions and antigen presentation. Specific sugar structures (glycoforms) on these proteins are vital for immune recognition and function, impacting diseases like rheumatoid arthritis.
Area of Science:
- Immunology
- Glycobiology
- Molecular Biology
Background:
- Glycoproteins are fundamental to immune responses, encompassing both innate and adaptive immunity.
- Specific glycoforms are essential for the proper functioning of major histocompatibility complex (MHC) antigens and T cell receptors.
- Sugars on glycoproteins influence immune cell interactions and antigen processing.
Purpose of the Study:
- To elucidate the multifaceted roles of glycoproteins and their specific glycoforms in cellular and humoral immune responses.
- To highlight the involvement of glycosylation in immune cell interactions and antigen presentation.
- To explore the pathological implications of aberrant glycosylation in autoimmune diseases such as rheumatoid arthritis.
Main Methods:
- Review and synthesis of existing literature on glycoprotein function in immunity.
- Analysis of the structural and functional significance of specific glycoforms in immune processes.
- Examination of the role of glycosylation in intercellular junctions and antigen recognition.
Main Results:
- Specific glycoforms are critical for the folding, quality control, and assembly of key immune complexes like MHC and T cell receptors.
- Oligosaccharides on glycoproteins facilitate T cell-antigen presenting cell interactions by orienting binding, offering protease protection, and limiting non-specific interactions.
- Aberrant glycoforms, such as agalactosylated immunoglobulin G, can trigger immune responses and contribute to autoimmune pathology via interactions with lectins like mannose-binding lectin.
Conclusions:
- Glycoproteins and their diverse glycoforms are indispensable for virtually all aspects of the immune system.
- The precise structure of glycosylation dictates protein stability, immune cell interactions, and antigen recognition.
- Dysregulated glycosylation represents a significant factor in the pathogenesis of autoimmune diseases, offering potential therapeutic targets.
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