CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >

2019 , Vol. 37 >Issue 4: 444 - 447

DOI: https://doi.org/10.12140/j.issn.1000-7423.2019.04.013

ORIGINAL ARTICLES

Therapeutic effect of NK cells stimulated by Toxoplasma gondii excretory/secretory antigens on B16F10 melanoma in mice

  • Yu-meng JIAO ,
  • Hui XIA ,
  • Xue-mei WANG ,
  • Zhi-yong TAO ,
  • Lin ZHU ,
  • Qiang FANG
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  • Department of Microbiology and Parasitology, Bengbu Medical College, Anhui Key Laboratory of Infection and Immunity, Bengbu 233030, China

Received date: 2019-01-09

  Online published: 2019-09-05

Supported by

Supported by the Scientifc Research Innovation Team Project of Anhui Colleges and Universities(No. 2016-40), Key Research Project of Natural Science in Colleges and Universities of Anhui Province (No. KJ2015A235), Bengbu Medical College Scientific Research Fund (No. BYKL1407ZD) and Undergraduate Students Innovation Training Program of Anhui Higher Education Institutions(No. 201610367021, No. 201510367047)

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Abstract

Objective To observe the therapeutic effect of natural killer (NK) cells stimulated by Toxoplasma gondii excretory/secretory antigens (TgESA) on the growth of B16F10 melanoma in mice. Methods TgESA was obtained from the culture of T. gondii tachyzoites in vitro for 12 hours. The tumor-bearing animal models were established by direct injection of melanoma B16F10 cells into the right axillary of ten mice (2 × 105/mouse). Five of the melanoma-inoculated mice were intraperitoneally treated with TgESA(100 μl/mouse) 7 days after inoculation of B16F10 cells, the rest 5 mice were treated with PBS only as control. One week after the treatment, all mice were euthanized, and the NK cells were isolated from the splenocytes of two groups (named NKB16F10 and NKESA). Total 30 naïve C57BL/6 mice were randomly divided into 3 groups with 10 mice each group. Each mouse was inoculated with 2 × 105 B16F10 cells subcutaneously into axillary. One week after melanoma inoculation, one group of mice were passive transferred with 2 × 105 of NKB16F10 cells through tail vein injection (group of NKB16F10). Another group of mice were transferred with the same number of NKESA cells (group of NKESA). The third group of mice were given with PBS only as control. After passive transfer, the tumor growth, mortality and survival rate in the transferred mice were observed and recorded for 35 days. Results The visible time of tumor in mice of NKESA group [(14.70 ± 0.95) d] was significantly longer than that in NKB16F10 group [(12.60 ± 0.70) d] and in control group [(8.50 ± 0.85) d] (P < 0.05). The tumor size in NKESA group [(577.79 ± 49.70) mm2] was also significantly smaller than that in NKB16F10 group [(686.53 ± 17.84) mm2] and in control group [(787.84 ± 19.94) mm2] at D35. The delayed appearance of tumor and smaller tumor size in group of NKB16F10 was also significant compared to control group. Mice began to die at D24 for control group, D27 for NKB16F10 group and D30 for NKESA group after tumor inoculation, and the number of mice remain alive was 3, 4 and 6 respectively at terminal time D35 with significant difference between NKESA group and control group.Conclusion Passive transfer of NK cells stimulated by TgESA conferred therapeutic effect on B16F10 melanoma in recipient mice.

Key words： Toxoplasma gondii; Excretory/secretory antigens; Natural killer cells; Melanoma

Cite this article

Yu-meng JIAO , Hui XIA , Xue-mei WANG , Zhi-yong TAO , Lin ZHU , Qiang FANG . Therapeutic effect of NK cells stimulated by Toxoplasma gondii excretory/secretory antigens on B16F10 melanoma in mice[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2019 , 37(4) : 444 -447 . DOI: 10.12140/j.issn.1000-7423.2019.04.013

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