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Sialic acids and autoimmune disease.

Vinay S Mahajan1,2,3, Shiv Pillai1,2

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PubMed
Summary

Loss of inhibitory immune signaling, often involving Siglecs (sialic acid-binding proteins), can lead to autoimmunity. This review details Siglec functions in immune tolerance and their role in preventing autoimmune diseases.

Keywords:
CD22CMAHSIAESiglecsautoimmunitysialic acids

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Area of Science:

  • Immunology
  • Molecular Biology
  • Glycobiology

Background:

  • Autoimmunity arises from impaired immune system regulation.
  • Sialic acid-recognizing Ig superfamily lectins (Siglecs) are key inhibitory receptors on immune cells.
  • Siglecs bind sialic acids, recruiting phosphatases to dampen immune responses.

Purpose of the Study:

  • To review the inhibitory functions of Siglecs, particularly CD22/Siglec-2 and Siglec-G.
  • To explore the role of Siglecs in maintaining immune tolerance and preventing autoimmunity.
  • To discuss the impact of sialic acid modifications and related proteins on inflammation.

Main Methods:

  • Literature review focusing on Siglec inhibitory signaling.
  • Analysis of B lymphocyte context for Siglec function.
  • Examination of sialic acid metabolism and binding proteins in autoimmunity.

Main Results:

  • Siglecs, like CD22/Siglec-2 and Siglec-G, are crucial for immune suppression.
  • Dysregulation of Siglec-mediated inhibition contributes to autoimmune conditions.
  • Altered sialic acid structures and associated proteins impact inflammatory states.

Conclusions:

  • Restoring Siglec-mediated inhibitory signaling is vital for immune homeostasis.
  • Siglecs represent potential therapeutic targets for autoimmune diseases.
  • Understanding sialic acid biology is key to managing autoimmunity and inflammation.