Abstract:
:The ability of different subpopulations of blood mononuclear cells to serve as accessory cells in the activation of CD4+ and CD8+ T cells via Ti-CD3 or with phytohaemagglutinin (PHA) was studied. Pure CD4+ or CD8+ T cells did not respond to particle-bound anti-CD3 monoclonal antibodies (MoAb) or PHA, whereas responses were seen when non-T cells served as accessory cells. Removal of class II-positive cells from peripheral blood mononuclear cells (PBMC) or from non-T cells diminished, but did not completely abolish, the responses in both T cell subsets, indicating that the accessory cells are mainly found among the class II-positive cells. However, the class II molecules themselves were not involved, as demonstrated in antibody-blocking experiments. Removal of monocytes decreased the ability of non-T cells to serve as accessory cells for both CD4+ and CD8+ cells in PHA activation. In contrast, the removal of monocytes resulted in an enhanced activation by anti-CD3 MoAb in CD4+ T cells, while the activation of CD8+ T cells was less affected. Positively selected B cells were effective accessory cells in anti-CD3 and PHA activation. Furthermore, Epstein-Barr virus (EBV)-transformed B cell lines were very potent accessory cells both in anti-CD3 and PHA activation of T cells, and showed the strongest accessory cell function observed in this system on a per cell basis.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Halvorsen R,Leivestad T,Gaudernack G,Thorsby Edoi
10.1111/j.1365-3083.1988.tb02383.xsubject
Has Abstractpub_date
1988-05-01 00:00:00pages
555-63issue
5eissn
0300-9475issn
1365-3083journal_volume
27pub_type
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