Sarsasapogenin-AA13 (AA13) is a novel synthetic derivative of sarsasapogenin extracted from the Chinese herb Rhizoma Anemarrhenae. In this study we investigated the effects of AA13 on lipopolysaccharide (LPS)-induced production of inflammatory factors in macrophage cells and the anti-inflammatory activity of AA13 in an inflammatory model of dimethylbenzene-induced ear edema. Macrophage cells (RAW264.7 cells and mouse peritoneal macrophages) were exposed to LPS (1 μg/mL); pretreatment with AA13 (5â20 μmol/L) dose-dependently inhibited LPS-induced production of NO, TNF-α and PGE2, and LPS-stimulated expression levels of COX-2 and iNOS. Furthermore, pretreatment with AA13 dose-dependently suppressed LPS-stimulated phosphorylation of p38 and JNK, but had no effect on ERK in RAW264.7 cells. Moreover, pretreatment with AA13 inhibited LPS-induced activation of the nuclear factor (NF)-κB in RAW264.7 cells. The in vivo anti-inflammatory activity of AA13 was demonstrated in a mouse inflammatory model: pre-treatment with either AA13 (20 mg·kgâ1·dâ1, ig) or a positive control antifani (10 mg·kgâ1·dâ1, ig) for 3 d significantly relieved dimethylbenzene-induced ear edema. Our results demonstrate that AA13 effectively inhibit LPS-induced inflammatory responses in macrophage cells in vitro and relieve dimethylbenzene-induced ear edema in vivo.
菝葜皂苷元-
AA13(
AA13)是从中草药知母中提取的一种新型合成
菝葜皂苷元衍
生物。本研究探讨了
AA13 对脂
多糖(LPS)诱导的巨噬细胞炎症因子产生的影响,以及
AA13 在二
甲苯诱导的耳
水肿炎症模型中的抗炎活性。巨噬细胞(RAW264.7细胞和小鼠腹腔巨噬细胞)暴露于LPS(1 δ¼g/mL);
AA13(5â20 δ¼mol/L)剂量依赖性地抑制LPS诱导的NO、TNF-δ和
PGE2的产生,以及LPS刺激的COX-2和iNOS的表达
水平。此外,在 RAW264.7 细胞中,预处理
AA13 可剂量依赖性地抑制 LPS 刺激的 p38 和 JNK
磷酸化,但对 ERK 没有影响。此外,
AA13 还能抑制 LPS 诱导的 RAW264.7 细胞核因子(NF)-δB 的活化。
AA13的体内抗炎活性在小鼠炎症模型中得到了证实:用
AA13(20 mgÂ-kgâ1Â-dâ1, ig)或阳性对照抗法尼(10 mgÂ-kgâ1Â-dâ1, ig)预处理3 d可显著缓解二
甲苯诱导的耳部
水肿。我们的研究结果表明,
AA13能有效抑制体外LPS诱导的巨噬细胞炎症反应,缓解体内二
甲苯诱导的耳
水肿。