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Sequential changes in glycolipid expression during human B cell differentiation: enzymatic bases

S Taga1, C Tétaud, M Mangeney

  • 1Laboratoire de Biologie des Tumeurs Humaines, CNRS URA 1156, Institut G. Roussy, Villejuif, France.

Biochimica Et Biophysica Acta
|January 3, 1995
PubMed
Summary

Human B cell differentiation involves dynamic changes in glycosphingolipid expression. These shifts are primarily driven by the sequential activation of specific glycosyltransferases during B cell development.

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Area of Science:

  • Immunology
  • Glycobiology
  • Cell Biology

Background:

  • B cell differentiation is characterized by sequential alterations in glycosphingolipid expression.
  • Specific glycosphingolipids (Gb3, Gb4, GM2) act as stage-specific antigens on B cells.
  • Understanding the enzymatic basis of these changes is crucial for B cell biology.

Purpose of the Study:

  • To investigate the biosynthetic mechanisms underlying glycosphingolipid modifications during B cell differentiation.
  • To compare the activities of key glycosyltransferases involved in lacto-, ganglio-, and globo-series glycolipid synthesis across B cell differentiation stages.

Main Methods:

  • Assessed glycosyltransferase activities (Lc3, GM3, Gb4, GM2 synthetases, Gb3 synthetase) in various B cell lines and normal B lymphocytes.

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  • Determined optimal enzyme requirements for synthesizing specific glycolipids in B lymphocytes.
  • Measured enzyme activities in B cells at different differentiation stages.

    • Main Results:

    • Beta 1-->3 N-Acetylglucosaminyltransferase (Lc3 synthetase) activity is high in early B cells and absent in later stages.
    • Alpha 2-->3 sialyltransferase (GM3 synthetase) is activated from pre-B cells to myeloma cells.
    • Alpha 1-->4 galactosyltransferase (Gb3 synthetase) appears in late differentiation stages.
    • Beta 1-->3 N-Acetylgalactosaminyltransferase (Gb4 synthetase) is found in activated B cells, while beta 1-->4 N-Acetylgalactosaminyltransferase (GM2 synthetase) is active in activated and terminally differentiated B cells.

    Conclusions:

    • Sequential changes in major glycosphingolipid series during B cell differentiation are largely attributed to the sequential activation of their respective glycosyltransferases.
    • Glycosyltransferase activity profiles correlate with specific B cell differentiation stages, highlighting their regulatory role.