Department of Forest Science, Andong National University, Andong 36729, Republic of Korea.
J Microbiol Biotechnol. 2023 Jul 28;33(7):934-940. doi: 10.4014/jmb.2301.01039. Epub 2023 Apr 19.
(SP) is a traditional medicinal plant. SP has been reported to have anti-inflammatory, anticancer, and anti-human immunodeficiency virus (HIV) activities. However, there is currently no research available on the immunostimulatory activity of SP. Therefore, in this study, we report that leaves (SPL) activate macrophages. Increased secretion of both immunostimulatory mediators and phagocytic activity was observed in SPL-treated RAW264.7 cells. However, this effect was reversed by the inhibition of TLR2/4. In addition, inhibition of p38 decreased the secretion of immunostimulatory mediators induced by SPL, and inhibition of TLR2/4 decreased the phosphorylation of p38 induced by SPL. SPL augmented p62/SQSTM1 and LC3-II expression. The increase in protein levels of p62/SQSTM1 and LC3-II induced by SPL was decreased by the inhibition of TLR2/4. The results obtained from this study suggest that SPL activates macrophages via TLR2/4-dependent p38 activation and induces autophagy in macrophages via TLR2/4 stimulation.
(SP)是一种传统药用植物。已有报道称,SP 具有抗炎、抗癌和抗人类免疫缺陷病毒(HIV)的活性。然而,目前尚无关于 SP 的免疫刺激活性的研究。因此,在本研究中,我们报告称 叶(SPL)可激活巨噬细胞。在 SPL 处理的 RAW264.7 细胞中,观察到免疫刺激介质和吞噬活性的分泌均增加。然而,这种作用被 TLR2/4 的抑制所逆转。此外,p38 的抑制减少了 SPL 诱导的免疫刺激介质的分泌,而 TLR2/4 的抑制减少了 SPL 诱导的 p38 的磷酸化。SPL 增加了 p62/SQSTM1 和 LC3-II 的表达。SPL 诱导的 p62/SQSTM1 和 LC3-II 蛋白水平的增加被 TLR2/4 的抑制所降低。本研究的结果表明,SPL 通过 TLR2/4 依赖性 p38 激活来激活巨噬细胞,并通过 TLR2/4 刺激诱导巨噬细胞自噬。