Radiation-induced matrix metalloproteinases limit natural killer cell-mediated anticancer immunity in NCI-H23 lung cancer cells

Heo,Woong; Lee,Young  Shin; Son,Cheol  Hun; Yang,Kwangmo; Park,You  Soo; Bae,Jaeho

doi:10.3892/mmr.2014.2918

Radiation-induced matrix metalloproteinases limit natural killer cell-mediated anticancer immunity in NCI-H23 lung cancer cells

Authors:
- Woong Heo
- Young Shin Lee
- Cheol Hun Son
- Kwangmo Yang
- You Soo Park
- Jaeho Bae
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Affiliations: Department of Biochemistry, Pusan National University School of Medicine, Yangsan, Gyeongsangnam-do 626-770, Republic of Korea, Department of Research Center, Dongnam Institute of Radiological and Medical Sciences, Busan, Gijang 619-953, Republic of Korea
Published online on: November 10, 2014 https://doi.org/10.3892/mmr.2014.2918
Pages: 1800-1806

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Abstract

Radiotherapy has been used to treat cancer for >100 years and is required by numerous patients with cancer. Ionizing radiation effectively inhibits the growth of cancer cells by inducing cell death and increasing anticancer immunity, through the induction of natural killer group 2 member D ligands (NKG2DLs); however, adverse effects have also been reported, including the promotion of metastasis. Matrix metalloproteinases (MMPs) are induced by ionizing radiation and have an important role in the invasion and metastasis of cancer cells. Previously, MMPs were demonstrated to increase the shedding of NKG2DLs, which may reduce the surface expression of NKG2DLs on cancer cells. As a consequence, the cancer cells may escape natural killer (NK)‑mediated anticancer immunity. In the present study, NCI‑H23 human non‑small cell lung cancer cells were used to investigate the combined effects of ionizing radiation and MMP inhibitors on the expression levels of NKG2DLs. Ionizing radiation increased the expression of MMP2 and ADAM metalloproteinase domain 10 protease, as well as NKG2DLs. The combined treatment of ionizing radiation and MMP inhibitors increased the surface expression levels of NKG2DLs and resulted in the increased susceptibility of the cancer cells to NK‑92 natural killer cells. Furthermore, soluble NKG2DLs were increased in the media by ionizing radiation and blocked by MMP inhibitors. The present study suggests that radiotherapy may result in the shedding of soluble NKG2DLs, through the induction of MMP2, and combined treatment with MMP inhibitors may minimize the adverse effects of radiotherapy.

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