Ferulic acid reduces inflammatory response induced by radiation through Sirt1-NLRP3 pathway

Abstract

Objective: A model of inflammatory damage was induced by radiation to investigate whether ferulic acid (FA) can reduce the inflammatory response through the Sirt1-NLRP3 inflammatory pathway. This will help discover radiation-protective drugs and elucidate the molecular mechanisms related to radiation-induced inflammatory damage.
Methods: A mouse model of radiation-induced immunoinflammatory injury was established to verify the anti-inflammatory effects of FA in vivo. C57BL/6J mice were randomly divided into six groups, and 5 Gy whole-body irradiation was used for modeling. Mice were administered a gastric solvent, amifostine, or 25, 50, or 100 mg/kg FA daily for 12 days, consecutively, before irradiation. The serum of mice was collected 24 hour after irradiation to observe the content of inflammatory factors interleukin (IL)-1β, IL-18, IL-6, and tumor necrosis factor (TNF)-α. The spleen and thymus tissues of mice were weighed and the organ index was calculated for pathological testing and immunofluorescence detection.
Results: FA reduced the radiation-induced decrease in the spleen and thymus indices. FA significantly reduced the secretion of inflammatory factors in the serum and reversed the radiation-induced reduction in lymphocytes in the spleen and thymus of mice. FA activated Sirt1 and inhibited the expression of the NLRP3 inflammasome to alleviate the inflammatory response.
Conclusions: FA reduced radiation-induced inflammation in animals, possibly by activating Sirt1 and reducing nucleotide oligomerization domain (NOD)-like receptor thermal protein domain associated protein 3 (NLRP3) inflammasome expression, thereby reducing the secretion of inflammatory factors.

Keywords

Ferulic acid / NLRP3 inflammasome / Radiation inflammation / Sirt1

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