A novel population of B7-1+ T cells producing intracellular IL-4 is decreased in patients with multiple sclerosis.
We identified a novel population of human T cells, studied directly ex vivo, that co-express surface B7-1 and intracellular IL-4. These peripheral blood B7-1+/CD4+ T cells expressed cell surface molecules associated with differentiation including CD45RO and MHC class II, yet were CD69(-) and CD25(-). In short-term cultures, T cell receptor (TCR) cross-linking induced further IL-4 production with little IFN-gamma or TNF-alpha. In marked contrast, CD4+ T cells negative for B7-1 expressed intracellular IFN-gamma and high amounts of TNF-alpha but little IL-4 upon TCR cross-linking. The CD4+/B7-1+/IL-4-expressing T cells were of polyclonal origin based on their diverse TCR repertoire. To explore the biological significance of this B7-1+/IL-4+ T cell population and to assess its potential regulatory role in autoimmune disease, we examined whether these T cells isolated ex vivo were altered in subjects with multiple sclerosis (MS). While the frequency of B7-1+ T cells was enhanced in patients with MS as compared to normal subjects, there was a significant diminution of B7-1+/IL-4+ T cells in the patients. The decrease in these IL-4-producing T cells in patients with autoimmune disease is consistent with a possible role as immunoregulatory T cells.
Kipp
B
B
Laboratory of Cellular and Molecular Immunology, Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston 02115, USA.
Bar-Or
A
A
Gausling
R
R
Oliveira
E M
EM
Fruhan
S A
SA
Stuart
W H
WH
Hafler
D A
DA
D015703:Antigens, CD / Q000096:biosynthesis; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000276:immunology*; D051940:B7-2 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002469:Cell Separation; D006801:Humans; D016130:Immunophenotyping; D007371:Interferon-gamma / Q000096:biosynthesis; D016753:Interleukin-10 / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis*; D007424:Intracellular Fluid / Q000276:immunology; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D020529:Multiple Sclerosis, Relapsing-Remitting / Q000097:blood / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497964:CD86 protein, human; D008562:Membrane Glycoproteins; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D015847:Interleukin-4; D007371:Interferon-gamma