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Role of TLR5 in inflammation and tissue damage after intestinal ischemia-reperfusion injury.

Biochemical and biophysical research communications (2019-09-02)
Homare Ito, Ai Sadatomo, Yoshiyuki Inoue, Naoya Yamada, Emi Aizawa, Erika Hishida, Ryo Kamata, Tadayoshi Karasawa, Hiroaki Kimura, Sachiko Watanabe, Takanori Komada, Hisanaga Horie, Joji Kitayama, Naohiro Sata, Masafumi Takahashi
ABSTRACT

Intestinal ischemia/reperfusion (I/R) injury is a life-threatening complication that leads to inflammation and remote organ damage. However, the underlying mechanism is not yet fully understood. Toll-like receptor 5 (TLR5) is highly expressed in mucosa and recognizes flagellin, the main component of the bacterial flagella. Here, we investigated the role of TLR5 in inflammation and tissue damage after intestinal I/R injury using TLR5-deficient mice. Intestinal levels of TLR5 mRNA and flagellin protein were elevated in wild-type mice subjected to intestinal I/R. Although TLR5 deficiency had no effect on intestinal flagellin levels, it significantly attenuated intestinal injury and inflammatory responses after intestinal I/R. TLR5 deficiency also markedly improved survival in mice after intestinal I/R injury. In wild-type mice, intestinal I/R injury induced remote organ damage, particularly in the lung, which was attenuated by TLR5 deficiency. Furthermore, TLR5 deficiency prevented lung inflammatory responses and vascular permeability after intestinal I/R injury. These findings demonstrate a novel role of TLR5 and provide new insights into the mechanism underlying inflammation and tissue damage after intestinal I/R injury.

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Solketal methacrylate, 50 wt. % in dichloromethane, contains ~280 ppm 4-tert-butylcatechol as inhibitor