Umbilical cord blood T cells express multiple natural cytotoxicity receptors after IL-15 stimulation, but only NKp30 is functional.
The natural cytotoxicity receptors (NCRs) NKp30, NKp44, and NKp46 are thought to be NK lineage restricted. Herein we show that IL-15 induces NCR expression on umbilical cord blood (UCB) T cells. NCRs were mainly on CD8(+) and CD56(+) UCB T cells. Only NKp30 was functional as demonstrated by degranulation, IFN-gamma release, redirected killing, and apoptosis. Since NCRs require adaptor proteins for function, the expressions of these adaptors were determined. The adaptors used by NKp30 and NKp46, FcepsilonR1gamma and CD3zeta, were detected in UCB T cells. There was a near absence of DAP12, the adaptor for NKp44, consistent with a hypofunctional state. NKp46 was on significantly fewer UCB T cells, possibly accounting for its lack of function. Adult peripheral blood (PB) T cells showed minimal NCR acquisition after culture with IL-15. Since UCB contains a high frequency of naive T cells, purified naive T cells from adult PB were tested. Although NKp30 was expressed on a small fraction of naive PB T cells, it was nonfunctional. In contrast to UCB, PB T cells lacked FcepsilonR1gamma expression. These results demonstrate differences between UCB and PB T cells regarding NCR expression and function. Such findings challenge the concept that NCRs are NK cell specific.
Tang
Qin
Q
Department of Pediatrics, Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA.
Grzywacz
Bartosz
B
Wang
Hongbo
H
Kataria
Nandini
N
Cao
Qing
Q
Wagner
John E
JE
Blazar
Bruce R
BR
Miller
Jeffrey S
JS
Verneris
Michael R
MR
D000328:Adult; D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000276:immunology; D015550:Cell Degranulation / Q000235:genetics / Q000276:immunology; D045744:Cell Line, Tumor; D002469:Cell Separation; D002478:Cells, Cultured; D003601:Cytotoxicity Tests, Immunologic; D005312:Fetal Blood / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D005786:Gene Expression Regulation / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D019409:Interleukin-15 / Q000502:physiology*; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology; D051379:Mice; D055628:Natural Cytotoxicity Triggering Receptor 3 / Q000096:biosynthesis / Q000097:blood* / Q000502:physiology; D055611:Natural Killer T-Cells / Q000276:immunology* / Q000378:metabolism
D019409:Interleukin-15; C431710:NCR3 protein, human; D055628:Natural Cytotoxicity Triggering Receptor 3; D007371:Interferon-gamma
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