Vibrio vulnificus-induced death of Jurkat T-cells requires activation of p38 mitogen-activated protein kinase by NADPH oxidase-derived reactive oxygen species |
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Authors: | Kim Woo Hyang Goo Sung Young Shin Myeong Heon Chun Se-Jin Lee Heuiran Lee Kyu-Ho Park Soon-Jung |
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Institution: | Department of Environmental Medical Biology and Institute of Tropical Medicine, The Brain Korea 21 Project, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Republic of Korea. |
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Abstract: | Vibrio vulnificus, a pathogenic bacterium causing primary septicemia, exhibited cytotoxicity towards Jurkat cells of T-lymphocytes through intracellular reactive oxygen species (ROS) production. Pretreatment of Jurkat T-cells with diphenyleneiodonium chloride (DPI) abolished V. vulnificus-induced ROS generation and bacterial ability to cause cell death. Jurkat T-cells expressing dominant-negative protein of Rac subunit of NADPH oxidase (NOX) did not show increased ROS production and cell death by V. vulnificus. Vibrio vulnificus also triggered phosphorylation of mitogen-activated protein kinases (MAPKs) including p38 and ERK1/2 in Jurkat T-cells. Experiments using inhibitors or small interfering RNAs for each MAPK showed that both MAPKs are involved in V. vulnificus-induced cell death. DPI only blocked the phosphorylation of p38 MAPK in Jurkat T-cells exposed by V. vulnificus. This study demonstrates that V. vulnificus induces death of Jurkat T-cells via ROS-dependent activation of p38 MAPK, and that NOX plays a major role in ROS generation in V. vulnificus-exposed cells. |
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