Hyperthermia Increases Natural Killer Cell Cytotoxicity against SW-872 Liposarcoma Cell Line

نویسندگان

  • Azin Ebrahimpour Department of Immunology, Shiraz University of Medical Sciences, Shiraz, Iran
  • Marzie Norouzian Department of Immunology, Shiraz University of Medical Sciences, Shiraz, Iran
  • Ramin Lotfi Institute of Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service BadenWürttemberg-Hessen | Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
  • Shirin Farjadian Department of Immunology, Shiraz University of Medical Sciences, Shiraz, Iran
  • Vahid Younesi Department of Immunology, Shiraz University of Medical Sciences, Shiraz, Iran
چکیده مقاله:

Background: Although there is convincing data in support of the effectiveness of hyperthermia in tumor therapy, the molecular mechanisms underlying the clinical effects of hyperthermia are still poorly understood. Objective: To investigate natural killer (NK) cell cytotoxicity against heat-treated SW-872 and HeLa tumor cell lines. Methods: NKG2D ligands and HLA class I transcription were examined using quantitative real-time PCR in treated tumor cell lines at 0, 2, 4, 6 and 12 h following thermal treatment at 39C and 42C for 1 h. The expression of MICA/B, ULBP1 and ULBP2 were also determined by flow cytometry. NK92-MI cytotoxic activity against heat-treated target cell lines was assessed by LDH release as well as annexin-V and 7-AAD assays. Results: Our results showed that heat treatment at 39C improved the cytolytic activity of NK cells against SW-872 cells without increasing NKG2D ligand concentration or decreasing HLA class I levels. Conclusion: The observed increase in the cytotoxicity of NK cells against SW-872 cells after hyperthermia does not coincide with changes in MICA/B, ULBP1 and ULBP2 ligands of NKG2, however, the expression of other ligands in target cells may have made the cells susceptible to the cytotoxic effect of NK cells.

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عنوان ژورنال

دوره 10  شماره 2

صفحات  93- 102

تاریخ انتشار 2013-06-01

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