2007 Fiscal Year Final Research Report Summary
Molecular regulation of NK cell cytotoxicity fir human hepatocellular carcinoma
| Project/Area Number |
18390216
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Gastroenterology
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| Research Institution | Osaka University |
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Principal Investigator |
TAKEHARA Tetsuo Osaka University, Graduate School of Medicine, Associate Professor (70335355)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAMATSU Naoki Osaka University, Graduate School of Medicine, Assistant Professor (30362700)
TATSUMI Tomohide Osaka University, Hospital, Assistant Professor (20397699)
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| Project Period (FY) |
2006 – 2007
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| Keywords | MICA / NKG2D / HCC / NK receptor / Liver / Tumor / Innate immunity / MICB |
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| Research Abstract |
Soluble forms of MHC class I-related chain A and B (MICA/B) increase in sera of patients with malignancy and impair the anti-tumor immune response by downregulating expression of their cognate immunoreceptor NKG2D. Recently, soluble MICA/B were reported to appear even in some premalignant diseases, raising the question about the impact of soluble MICA/B produced from tumors on the expression of NKG2D. The present study examined soluble MICA/B in chronic liver disease and hepatocellular carcinoma (HCC) and their involvement in the immune cell expression of NKG2D during transcatheter arterial embolization (TAE) for HCC. The levels of soluble MICA/B were significantly higher in chronic liver disease and HCC patients than in healthy volunteers. The progression of liver disease and that of the tumor were independent determinants for soluble MICA/B levels. Immunohistochemistry revealed that MICA/B was expressed not only in HCC tissue but also on hepatocytes in cirrhotic livers. The TAE therapy significantly decreased serum levels of soluble MICA, but not soluble MICB, and increased the NKG2D expression on NK cells and CD8-positive T cells; there was an inverse correlation between changes in soluble MICA levels and in NKG2D expression. In vitro experiments confirmed that MICA-containing sera clearly downregulated NKG2D expression and suppressed NKG2D-mediated effector cell function. In conclusion, although soluble MICA/B are produced from both HCC and premalignant cirrhotic livers, therapeutic intervention for HCC can reduce the levels of soluble MICA and thereby upregulate the expression of NKG2D. Cancer therapy may have a beneficial effect on the NKG2D-mediated anti-tumor immunity.
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Research Products
(10 results)
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[Journal Article] Intrahepatic delivery of α-galactosylceramide-pulsed dendritic cells suppresses liver tumor2007
Author(s)
Tatsumi, T., Takehara, T., Yamaguchi, S., Sasakawa, A., Sakamori, R., Ohkawa, K., Kohga, K., Uemura, A., Hayashi, N
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Journal Title
Hepatology 45
Pages: 22-30
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Natural killer cell and hepatic cell interaction via NKG2A leads to dendritic cell-mediated induction of CD4+ CD25+ T cells with PD-1-dependent regulatory activities2007
Author(s)
Jinushi, M., Takehara, T., Tatsumi, T., Yamaguchi, S., Sakamori, R., Hiramatsu, N., Kanto, T., Ohkawa, K., Hayashi, N
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Journal Title
Immunology 120
Pages: 73-82
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Natural killer cell-mediated ablation of metastatic liver tumors by hydrodynamic injection of IFNα gene to mice2007
Author(s)
Takehara, T., Uemura, A., Tatsumi, T., Suzuki, T., Kimura, R., Shiotani, A., Ohkawa, K., Kanto, T., Hiramatsu, N., Hayashi, N
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Journal Title
Int J Cancer 120
Pages: 1252-1260
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Regulation of the NKG2D immunoreceptor by soluble MICA during transcatheter arterial embolization for hepatocellular carcinoma2007
Author(s)
Kohga, K., Takehara, T., Hikita, H., Sasakawa, A., Uemura, A., Sakamori, R., Yamaguchi, S., Tatsumi, T., Ohkawa, K., Kanto, T., Hiramatsu, N., Katayama, K., Kato, M., Hayashi, N
Organizer
The American Association for the Study of Liver Diseases The 58th Annual Meeting AASLD
Place of Presentation
Hynes Convention Center, Boston, MA, USA
Year and Date
20071102-06
Description
「研究成果報告書概要(欧文)」より
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