Systemic Cytokine Responses in Patients with Influenza-Associated Encephalopathy
Jun-ichi Kawada,Hiroshi Kimura,Yoshinori Ito,Shinya Hara,Masahiro Iriyama,Tetsushi Yoshikawa,Tsuneo Morishima +6 more
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TLDR
Investigation of the transcription of cytokine genes in peripheral blood leukocytes revealed that transcription of the interleukin (IL)-6, IL-10, and tumor necrosis factor-alpha genes was up-regulated to a greater extent in patients with encephalopathy than in those without neurologic complications, suggesting that influenza-associatedEncephalopathy might be a consequence of systemic immune responses.Abstract:
Influenza-associated encephalopathy, a severe neurologic complication of influenza, is being reported more frequently in Japan. We investigated the transcription of cytokine genes in peripheral blood leukocytes and compared patients with influenza and with encephalopathy or febrile convulsions and patients with influenza but without neurologic complications. A quantitative polymerase chain reaction (PCR) revealed that transcription of the interleukin (IL)-6, IL-10, and tumor necrosis factor-alpha genes was up-regulated to a greater extent in patients with encephalopathy than in those without neurologic complications. Plasma IL-6 levels also were higher in patients with encephalopathy, although the difference was marginal. Viral RNA in throat swabs was quantified using a real-time quantitative PCR. The virus load was similar among patients with encephalopathy or febrile convulsions or without neurologic complications. Furthermore, virus load was not correlated with either the transcription of cytokine genes or plasma cytokine concentrations. These results suggest that influenza-associated encephalopathy might be a consequence of systemic immune responses.read more
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