Human TSLP directly enhances expansion of CD8+ T cells.
Human thymic stromal lymphopoietin (TSLP) promotes CD4(+) T-cell proliferation both directly and indirectly through dendritic cell (DC) activation. Although human TSLP-activated DCs induce CD8(+) T-cell proliferation, it is not clear whether TSLP acts directly on CD8(+) T cells. In this study, we show that human CD8(+) T cells activated by T-cell receptor stimulation expressed TSLP receptor (TSLPR), and that TSLP directly enhanced proliferation of activated CD8(+) T cells. Although non-stimulated human CD8(+) T cells from peripheral blood did not express TSLPR, CD8(+) T cells activated by anti-CD3 plus anti-CD28 did express TSLPR. After T-cell receptor stimulation, TSLP directly enhanced the expansion of activated CD8(+) T cells. Interestingly, using monocyte-derived DCs pulsed with a cytomegalovirus (CMV)-specific pp65 peptide, we found that although interleukin-2 allowed expansion of both CMV-specific and non-specific CD8(+) T cells, TSLP induced expansion of only CMV-specific CD8(+) T cells. These results suggest that human TSLP directly enhances expansion of CD8(+) T cells and that the direct and indirect action of TSLP on expansion of target antigen-specific CD8(+) T cells may be beneficial to adoptive cell transfer immunotherapy.
Akamatsu
T
T
Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Kyoto, Japan.
Watanabe
N
N
Kido
M
M
Saga
K
K
Tanaka
J
J
Kuzushima
K
K
Nishio
A
A
Chiba
T
T
D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000821:virology; D049109:Cell Proliferation; D018920:Coculture Techniques; D016207:Cytokines / Q000032:analysis / Q000276:immunology*; D003587:Cytomegalovirus / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology; D005434:Flow Cytometry; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology; D053645:Interleukin-2 Receptor alpha Subunit / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000094632:Thymic Stromal Lymphopoietin
D016207:Cytokines; D007376:Interleukin-2; D053645:Interleukin-2 Receptor alpha Subunit; D000094632:Thymic Stromal Lymphopoietin