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Kawamura H, Kawamura T, Kokai Y, Mori M, Matsuura A, Oya H, Honda S, Suzuki S, Weerashinghe A, Watanabe H, Abo T. Expansion of Extrathymic T Cells as Well as Granulocytes in the Liver and Other Organs of Granulocyte-Colony Stimulating Factor Transgenic Mice: Why They Lost the Ability of Hybrid Resistance. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.10.5957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
When we attempted to characterize the immunological state in G-CSF transgenic mice, a large number of not only granulocytes but also lymphoid cells expanded in various immune organs. Such lymphoid cells were present at unusual sites of these organs, e.g., the parenchymal space in the liver. We then determined the phenotype of these lymphoid cells by immunofluorescence tests. It was demonstrated that CD3intIL-2Rβ+ cells (i.e., extrathymic T cells), including the NK1.1+ subset of CD3int cells (i.e., NKT cells), increased in the liver and all other tested organs. These T cells as well as NK cells mediated NK and NK-like cytotoxicity, especially at youth. However, they were not able to mediate such cytotoxicity in the presence of granulocytes. This result might be associated with deficiency in the hybrid resistance previously ascribed to these mice. In other words, G-CSF transgenic mice had a large number of extrathymic T cells (including NKT cells) and NK cells that mediate hybrid resistance, but their function was suppressed by activated granulocytes. Indeed, these granulocytes showed an elevated level of Ca2+ influx upon stimulation. The present results suggest that, in parallel with overactivation of granulocytes, extrathymic T cells and NK cells are concomitantly activated in number but that their function is suppressed in G-CSF transgenic mice.
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Affiliation(s)
- Hiroki Kawamura
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Toshihiko Kawamura
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Yasuo Kokai
- †Department of Pathology, Sapporo Medical University, Sapporo, Japan
| | - Michio Mori
- †Department of Pathology, Sapporo Medical University, Sapporo, Japan
| | - Akihiro Matsuura
- †Department of Pathology, Sapporo Medical University, Sapporo, Japan
| | - Hiroshi Oya
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Shigeru Honda
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Susumu Suzuki
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Anura Weerashinghe
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Hisami Watanabe
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
| | - Toru Abo
- *Department of Immunology, Niigata University School of Medicine, Niigata, Japan; and
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