[Experimental study on IL-2- and IL-15 application in allogeneic hematopoietic stem cell transplantation].
OBJECTIVE
To explore the impact of IL-2- and IL-15-activated donor natural killer (NK) cell infusion on graft-versus-host-disease (GVHD) and graft-versus-leukemia (GVL) effect post allogeneic hematopoietic stem cell transplantation (allo-HSCT).


METHODS
The C57BL/6 mice splenic NK cells were selected by microbeads, and then expanded in the media containing IL-2 and IL-15. The killing activity of NK cells was detected. In the leukemia mouse model, recipients (BALB/c) were intravenously inoculated with EL9611 leukemia cells 8 days before transplantation. Lethally irradiated BALB/c recipient mice were transplanted with 5 x 10(6) bone marrow cells (BMCs), or 5 x 10(6) BMCs plus 1 x 10(7) splenocytes with or without 1 x 10(7) activated NK cells. Additionally, NK cell infusion group mice were intraperitoneally injected with a mixture of IL-2 and IL-15 post transplant. Survival time, GVHD occurrence, lineage chimerism, TRBV spectra-typing were observed post transplant.


RESULTS
The purity of isolated splenic NK cells was 95.7% - 97.1%. The killing activity of NK cells after activation was increased by 3 times. GVHD did not occurred in allogeneic BMCs infusion group, whereas did from 1 week after transplant in allogeneic BMCs + splenocytes infusion group. The severity of GVHD in total body irradiation (TBI) experimental group was significantly lower than in splenocytes infusion group (P < 0.05). The survival time was 9.5 - 14.0 d in TBI alone conditioning group. In leukemia mouse model, 100 day survival rate was 10% the rest of them were died of leukemia while in experimental group, the more than 100 days survival rate was 80% (P < 0.01). PB NK cells at 2 week post-transplant were 4.8% in experimental group and 2.8% in control group. NK cells recovery in experimental group was earlier than that in control group (P < 0.05). TRBV reconstitution was faster in experimental group than in control group, moreover, the number of TRBV family expression was more in experimental group than in control group which mainly expressed monoclone or oligo-clone.


CONCLUSIONS
Donor alloreactive NK cells can be efficiently expanded and activated with IL-2 and IL-15. Donor activated NK cell infusion and IL-2, IL-15 treatment can promote immune reconstitution, mitigate GVHD and reduce leukemia relapse.
Chen
Guang-Hua
GH
Jiangsu Institute of Hematology, First Hospital of Soochow University, Suzhou 215006, China.
Wu
De-Pei
DP
Sun
Ai-Ning
AN
Yang
Ming-Zhen
MZ
Wang
Yi
Y
Tang
Xiao-Wen
XW
Chang
Hui-Rong
HR
Feng
Yu-Feng
YF
Zhu
Zi-Ling
ZL
D000818:Animals; D002478:Cells, Cultured; D006086:Graft vs Host Disease / Q000517:prevention & control; D020544:Graft vs Leukemia Effect; D018380:Hematopoietic Stem Cell Transplantation; D019409:Interleukin-15 / Q000276:immunology* / Q000494:pharmacology; D007376:Interleukin-2 / Q000276:immunology* / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL
D019409:Interleukin-15; D007376:Interleukin-2