International Immunology, Vol. 11, No. 5, 731-738,
May 1999
© 1999 Japanese Society for Immunology
Identification of an
2,6-sialyltransferase induced early after lymphocyte activation
Institute for Medical Microbiology and Hygiene, Department of Immunology, University of Freiburg, Hermann-Herder-Strasse 11, 79104 Freiburg, Germany
1 Molecular Glycobiology, Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
2 Tumor Immunology program, German Cancer Research Center, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
Correspondence to: H. Pircher
We have used mRNA differential display PCR to search for genes induced in activated T cells and we identified a gene encoding an
2,6-sialyltransferase (ST6GalNAc IV) that is rapidly induced in lymphocytes after antigen or mitogen stimulation. The 3.6 kb full-length cDNA clone (MK45) obtained contained a single open reading frame encoding a 302 amino acid protein and a 2.5 kb 3' untranslated region. MK45 expression in in vivo-activated CD8 T cells reached the highest level 4 h after antigen triggering and then declined rapidly to nearly base levels within 45 h. Northern blot analysis further revealed that MK45 expression was also induced in LPS-activated B cells and antigen-triggered CD4 T cells in vitro. MK45 expression was low or undetectable in most other mouse tissues examined, when compared to activated lymphocytes. Importantly, the mRNA expression level of other sialyltransferases remained largely unchanged during the early stage of lymphocyte activation. Finally, increased ecto-sialyltransferase activity and an altered sialylation pattern were demonstrated on the cell surface of early activated CD8 T cells. Our report identifies a candidate sialyltransferase gene that is involved in the early alteration of the sialylation pattern of cell surface molecules in activated lymphocytes.
Keywords: differential display, glycosyltransferases, lymphocyte stimulation, murine, sialylation
Transmitting editor: K. Eichmann
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