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Tanaka Y, Ohira M, Tashiro H, Imamura M, Chayama K, Ohdan H. Impact of alloimmune T cell responses on hepatitis C virus replication in liver transplant recipients. Hum Immunol 2014; 75:1259-67. [PMID: 25300999 DOI: 10.1016/j.humimm.2014.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 08/09/2014] [Indexed: 12/16/2022]
Abstract
We investigated the influence of alloimmune T cell responses on hepatitis C virus (HCV) replication in HCV-infected patients after liver transplantation (LT). To monitor the immune-status in 27 HCV-infected LT recipients, we routinely performed mixed lymphocyte reaction (MLR) assays within 4 weeks after LT. HCV RNA titers in most patients fluctuated in inverse proportion to the stimulation index (SI) of anti-donor reactive T cells early after LT. Two weeks after LT, recipients with high HCV RNA titers (>1000 KIU/mL) displayed a significantly lower SI for anti-donor reactive T cells than recipients with low HCV RNA titers did (<1000 KIU/mL). An in vitro transwell assay mimicking the anatomical features of the interaction between HCV-infected hepatocytes and alloreactive T cells in allograft livers demonstrated that interferon (IFN)-γ was necessary to suppress HCV replication. This study proves the significant impact of alloimmune T cell responses on HCV replication in HCV-infected LT recipients.
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Affiliation(s)
- Yuka Tanaka
- Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan
| | - Masahiro Ohira
- Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan
| | - Hirotaka Tashiro
- Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan
| | - Michio Imamura
- Medicine and Molecular Science, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan
| | - Kazuaki Chayama
- Medicine and Molecular Science, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan
| | - Hideki Ohdan
- Gastroenterological and Transplant Surgery, Applied Life Sciences, Institute of Biomedical & Health Sciences, Hiroshima University, Japan; Liver Research Project Center, Hiroshima University, Japan.
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