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TACI Isoforms Regulate Ligand Binding and Receptor Function.

Yolanda Garcia-Carmona1, Adrian T Ting1, Lin Radigan1

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|October 19, 2018
PubMed
Summary
This summary is machine-generated.

Human TACI gene alternative splicing creates two isoforms, TACI-S and TACI-L, controlling B cell maturation. TACI-S binds ligands with higher affinity and enhances NF-kB activation, impacting B cell responses.

Keywords:
B cellTACITLR9activationisoforms

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The TACI receptor plays a role in B cell proliferation, isotype switching, and antibody production.
  • Human TACI gene undergoes alternative splicing, yielding short (TACI-S) and long (TACI-L) isoforms, unlike murine TACI.
  • Previous studies indicated TACI-S, but not TACI-L, drives B cells toward a plasma cell phenotype.

Purpose of the Study:

  • To investigate the functional differences between human TACI-S and TACI-L isoforms.
  • To determine the subcellular localization and ligand-binding properties of TACI isoforms.
  • To elucidate the role of TACI isoforms in B cell signaling pathways.

Main Methods:

  • Utilized isoform-specific monoclonal antibodies for detection and localization.
  • Investigated protein complex formation and co-localization with signaling molecules (MyD88, TRAF6, TLR9).
  • Assessed ligand binding affinity (BAFF, APRIL) and NF-kB activation by TACI isoforms.

Main Results:

  • TACI-S and TACI-L form ligand-independent complexes, co-localizing with MyD88, TRAF6, and TLR9 in the endosomal compartment.
  • TACI-S exhibits significantly higher affinity for BAFF and APRIL ligands compared to TACI-L.
  • TACI-S promotes enhanced NF-kB activation, while TACI-L is predominant on the cell surface; TACI-S is found intracellularly and in specific B cell subsets.

Conclusions:

  • Alternative splicing of the human TACI gene generates functionally distinct isoforms.
  • TACI isoforms differ in ligand binding, subcellular localization, and signaling capabilities, influencing B cell maturation and immune responses.
  • Both TACI isoforms interact with key innate immune signaling molecules, suggesting complex regulatory roles in B cell biology.