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Chen Y, Zhou R, He L, Wang F, Yang X, Teng L, Li C, Liao S, Zhu Y, Yang Y, Chen H. Okra polysaccharide-2 plays a vital role on the activation of RAW264.7 cells by TLR2/4-mediated signal transduction pathways. Int Immunopharmacol 2020; 86:106708. [PMID: 32570039 DOI: 10.1016/j.intimp.2020.106708] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 06/11/2020] [Accepted: 06/11/2020] [Indexed: 01/18/2023]
Abstract
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 (RPS-2) 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-α 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-κB and MAPKs signaling pathways were studied by western blot analysis. It showed RPS-2 induced the phosphorylation of p65, IκBα, p38, ERK1/2 and JNK. At the same time, the specific inhibitors reduced these phosphorylation levels as well as NO, IL-10 and TNF-α amounts. In a word, RPS-2 activated macrophages by NF-κB and MAPKs signal transduction pathways.
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Affiliation(s)
- Yun Chen
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Ruigang Zhou
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Lixing He
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Fengyang Wang
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Xin Yang
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Ling Teng
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Chengheng Li
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Suya Liao
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Yongjian Zhu
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Yuhui Yang
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China
| | - Huricha Chen
- Hainan Key Lab of Tropical Animal Reproduction & Breeding and Epidemic Disease Research, Institute of Traditional South Chinese Veterinary Pharmacology, College of Animal Science and Technology, Hainan University, Haikou 570228, PR China.
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