Regulatory IL4+CD8+ T cells in patients with ankylosing spondylitis and healthy controls.
OBJECTIVE
Interleukin (IL)4+CD8+ regulatory T cells (Treg) obtained from peripheral blood mononuclear cells (PBMCs) from patients with ankylosing spondylitis (AS) by coculture with autologous dendritic cells (DC) have been previously described. In the present work, the proportions of IL4+CD8+ T cells in PB from patients with AS and controls are examined; in addition the conditions required for the generation of IL4+CD8+ Treg cells and their frequency in T cell lines from patients with AS and controls are investigated.


METHODS
CD8+ T cells were either stimulated non-specifically ex vivo and intracellular cytokines examined, or cocultured with DC and other stimuli, for 2 weeks. The resulting lines were analysed for cytokine expression. Clones derived from these lines were tested for regulatory function.


RESULTS
PBMCs from patients with AS and from human leukocyte antigen (HLA)-B27+ healthy controls contained a higher frequency of IL4+CD8+ T cells than those from HLA-B27- controls. Likewise, CD8+ T cell lines obtained by coculture with DC contained a higher ratio of IL4+ to interferon (IFN)gamma+ cells when obtained from patients with AS or HLA-B27+ controls. T cell clones obtained from these lines showed regulatory activity. Outgrowth of IL4+ CD8+ T cells required contact with DC, but not maturation with lipopolysaccharide (LPS); allogeneic DC were also effective. Coculture with lymphoblastoid cells, or anti-CD3/CD28 microbeads, produced only expansion of IFN gamma-producing CD8+ T cells.


CONCLUSIONS
The higher proportion of CD8+ cells which can produce IL4 in PB and in expanded CD8+ T cell lines suggests an altered pattern of CD8+ T cell differentiation in AS and in HLA-B27+ healthy individuals. This predisposition to generate IL4+CD8+ T cells may play a role in pathogenesis of spondyloarthritis.
Zhang
L
L
Department of Rheumatology and Immunology, Changzheng Hospital, Shanghai, China.
Jarvis
L B
LB
Baek
H-J
HJ
Gaston
J S Hill
JS
D000328:Adult; D002450:Cell Communication / Q000276:immunology; D002460:Cell Line; D018920:Coculture Techniques; D003713:Dendritic Cells / Q000276:immunology; D005260:Female; D015796:HLA-B27 Antigen / Q000097:blood; D006801:Humans; D015847:Interleukin-4 / Q000096:biosynthesis*; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D008875:Middle Aged; D013167:Spondylitis, Ankylosing / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
D015796:HLA-B27 Antigen; D015847:Interleukin-4