期刊
INTERNATIONAL IMMUNOPHARMACOLOGY
卷 86, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.intimp.2020.106708
关键词
Okra polysaccharide-2; Toll-like receptor; NF-kappa B; MAPKs
资金
- Hainan Provincial Natural Science Foundation of China [317092, 318QN202]
- China Scholarship Council
- National Natural Science Foundation of China [31802234]
- Hainan Provincial Key R&D Program of China [ZDYF2019085]
- Scientific Research Staring Foundation of Hainan University [KYQD(ZR)1825]
Polysaccharide is the main active component of okra (Abelmoschus esculentus L.) and it can effectively stimulate the activation of macrophages. However, the immune regulatory mechanism is still not clear. Therefore, the present study aimed to reveal the possible mechanism by investigating the effect of okra polysaccharide-2 (RPS2) on Toll-like receptor (TLR) 2/4-mediated signal transduction pathways in RAW264.7 murine macrophage cells. In order to confirm whether RPS-2 stimulated macrophages activation via TLR2 or TLR4, RAW264.7 murine macrophage cells were pretreated with TLR2/4 inhibitors for 1 h before RPS-2 treatment, and then the NO, IL-10, TNF-alpha levels were tested. The results indicated that both TLR2 and TLR4 were the keys of immune regulatory effect of RPS-2. Afterwards, the effect of RPS-2 on NF-kappa B and MAPKs signaling pathways were studied by western blot analysis. It showed RPS-2 induced the phosphorylation of p65, I kappa B alpha, p38, ERK1/2 and JNK. At the same time, the specific inhibitors reduced these phosphorylation levels as well as NO, IL-10 and TNF-alpha amounts. In a word, RPS-2 activated macrophages by NF-kappa B and MAPKs signal transduction pathways.
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