Abstract
Mitogen-activated protein kinases (MAPKs) and nuclear factor-kappa B (NF-κB) signaling pathways are pleiotropic regulator of many genes involved in lipopolysaccharide (LPS)-induced acute lung injury (ALI). The present study aimed to reveal the protective effect of isotetrandrine (ITD), a small molecule inhibitor, on various aspects of LPS-induced inflammation in vitro and in vivo. In vitro, RAW 264.7 cells were pretreated with different dose of ITD 1 h before treatment with 1 mg/L of LPS. In vivo, to induce ALI, male BALB/c mice were injected intranasally with LPS and treated with ITD (20 and 40 mg/kg) 1 h before LPS. In vitro, the cytokine levels of tumor necrosis factor-α, interleukin (IL)-1β, and IL-6 in supernatant were reduced by ITD. Meanwhile, in vivo, pulmonary inflammatory cell infiltration, myeloperoxidase activity, total cells, neutrophils, macrophages, along with the levels of tumor necrosis factor-α, IL-1β, and IL-6 in bronchoalveolar lavage fluid were dose-dependently attenuated by ITD. Furthermore, our data showed that ITD significantly inhibited the activation of MAPK and NF-κB, which are induced by LPS in ALI model. These results suggested that ITD dose-dependently suppressed the severity of LPS-induced ALI by ...Continue Reading
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Citations
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