Elevated serum levels of neutrophil elastase in patients with influenza virus-associated encephalopathy

Guilian Sun, Chiharu Ota, Setsuko Kitaoka, Yoko Chiba, Masaru Takayanagi, Taro Kitamura, Katsuya Yamamoto, Hiromi Fujie, Hitoshi Mikami, Mitsugu Uematsu, Naomi Hino-Fukuyo, Mitsutoshi Munakata, Shigeo Kure, Kazuhiro Haginoya

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We examined serum levels of various cytokines, chemokines, growth factors, and adhesion molecules in patients with uncomplicated influenza (n = 20) and influenza virus-associated encephalopathy (IE) (n = 18) to understand the underlying mechanism of IE. We found that IL-1β, IL-2, IL-5, IL-6, IL-7, IL-8, IL-10, IL-13, G-CSF, GM-CSF, TNF-α, TIMP-1, MMP-9, sE-selectin, and neutrophil elastase were elevated significantly in sera from patients with uncomplicated influenza and those with IE, compared with normal controls (n = 20). Of note, neutrophil elastase, sE-selectin, IL-8, and IL-13 were elevated significantly in IE as compared with uncomplicated influenza. In the present study, for the first time, we found that serum levels of neutrophil elastase were increased in patients with IE compared with uncomplicated influenza, which suggested that cerebral endothelial damage in the development of IE was mediated by neutrophil elastase. The present study implied that anti-elastase agents are possibly an effective therapeutic protocol for IE, but this needs further elucidation.

Original languageEnglish
Pages (from-to)190-195
Number of pages6
JournalJournal of the Neurological Sciences
Issue number1-2
Publication statusPublished - 2015 Feb 15


  • Adhesion molecule
  • Cytokine
  • E-selectin
  • Encephalopathy
  • Influenza
  • Neutrophil elastase
  • Soluble


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