IFN‑γ mediates graft‑versus‑breast cancer effects via enhancing cytotoxic T lymphocyte activity

Zhao,Qianjie; Tong,Lingling; He,Ningning; Feng,Guowei; Leng,Liang; Sun,Weijun; Xu,Yang; Wang,Yuebing; Xiang,Rong; Li,Zongjin

doi:10.3892/etm.2014.1760

IFN‑γ mediates graft‑versus‑breast cancer effects via enhancing cytotoxic T lymphocyte activity

Authors:
- Qianjie Zhao
- Lingling Tong
- Ningning He
- Guowei Feng
- Liang Leng
- Weijun Sun
- Yang Xu
- Yuebing Wang
- Rong Xiang
- Zongjin Li
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Affiliations: Department of Pathophysiology, School of Medicine, Nankai University, Ministry of Education, Tianjin 300071, P.R. China, Department of Pathophysiology, School of Medicine, Nankai University, Ministry of Education, Tianjin 300071, P.R. China
Published online on: June 5, 2014 https://doi.org/10.3892/etm.2014.1760
Pages: 347-354

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Abstract

Previous studies have demonstrated the beneficial effect of graft‑versus‑tumor (GVT) following hematopoietic stem cell transplantation (HSCT) on the incidence of leukemia relapse and the overall survival rate of patients with leukemia; however, detailed mechanisms underlying the effects GVT exhibits on solid tumors following allogeneic HSCT are yet to be elucidated. The aim of the present study was to investigate the immune mechanism underlying the effect of interferon (IFN)‑γ on GVT following allogeneic HSCT in breast cancer therapy. An in situ breast cancer mouse model was established by injecting 5x104 4T1 cells into the mammary fat pads of BALB/c mice. The 4T1 cells were transfected with the firefly luciferase reporter gene in order to monitor the tumor progression in real time. An allogeneic HSCT model was then established by transplanting bone marrow mononuclear cells from C57BL/6 mice to the BALB/c mice. To investigate the influence of T lymphocyte proliferation following allogeneic bone marrow transplantation, the levels of CD3+CD8+ cytotoxic T lymphocytes (CTLs) and CD4+CD25+ regulatory T cells were determined. In addition, IFN‑γ and granzyme B expression levels in splenic lymphocytes were analyzed using flow cytometry. Allogeneic HSCT was found to significantly promote the proliferation and cytotoxicity of CTLs and suppress the growth of breast cancer. Furthermore, the secretory levels of IFN‑γ and granzyme B by T cells were elevated following allogeneic HSCT. These results indicated that alloreactive T cells increased the secretion of IFN‑γ, which promoted the alloresponse of donor CTLs. In addition, the CTLs produced granzyme B, which exerted a tumor suppressive effect.

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