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. 1996 May;88(1):82–89. doi: 10.1046/j.1365-2567.1996.d01-638.x

Interleukin-12 induces cytotoxic NK1+ alpha beta T cells in the lungs of euthymic and athymic mice.

R Anzai 1, S Seki 1, K Ogasawara 1, W Hashimoto 1, K Sugiura 1, M Sato 1, K Kumagai 1, K Takeda 1
PMCID: PMC1456464  PMID: 8707355

Abstract

We recently reported that interleukin-12 (IL-12) stimulated hepatic NK1.1 Ag+ alpha beta T cells with intermediate T-cell receptor (TCR; NK1+ TCRint cells) and enhanced their NK1 expression (NK1high TCRint), and that these cells acquire strong major histocompatibility complex (MHC) unrestricted cytotoxicity in C57BL/6 mice, both +/+ and nu/nu. In the present study, we find that although murine lung normally has few NK1+ TCRint cells, NK1high TCRint cells are induced in+/+ and nu/nu mice after systemic administration of IL-12; these cells exhibit strong MHC unrestricted cytotoxicity against NK-sensitive and -resistant targets. A small number of NK1high TCRint cells was also found in peripheral blood after increased amounts of IL-12 were administered. Cytotoxicity tests in vitro revealed that the cytotoxic activity of the lung mononuclear cells (MNC) of C57BL/6 mice induced by IL-12 was abrogated by the depletion of either NK1+ or CD3+ cells, but not of CD8+ cells, as reportedly was the case of hepatic MNC, suggesting that NK1high TCRint cells are an antimetastatic population not only in the liver but also in the lung of mice. IL-12 injection into mice markedly elevates serum interferon-gamma (IFN-gamma) levels. However, although IL-12-induced cytotoxicity of NK1high TCRint cells was significantly reduced by anti-IFN-gamma antibody injection (which decreased serum IFN-gamma to an undetectable level), the appearance of NK1high TCRint cells in the lung and liver was not so affected. These results suggest that IFN-gamma is an important mediator of the cytotoxicity of NK1high TCRint cells but is not an essential factor for induction of these cells. We also added data showing that IL-12 has a broad antimetastatic effect against various liver and lung metastatic tumours intravenously injected into several strains of mice, including NK-deficient bg/bg mice. It can be considered that, in addition to NK cells, CD8+ cytotoxic T cells and gamma delta T cells, NK1+ TCRint cells can be categorized as one of the cytotoxic effector populations. These novel type cells distinct from regular T cells may play an important role in monitoring intra- and perivascular areas.

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Selected References

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