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Soyasaponin Bb Inhibits the Recruitment of Toll-Like Receptor 4 (TLR4) Into Lipid Rafts and Its Signaling Pathway by Suppressing the Nicotinamide Adenine Dinucleotide Phosphate (NADPH) Oxidase-Dependent Generation of Reactive Oxygen Species

Soyasaponin Bb Inhibits the Recruitment of Toll-Like Receptor 4 (TLR4) Into Lipid Rafts and Its Signaling Pathway by Suppressing the Nicotinamide Adenine Dinucleotide Phosphate (NADPH) Oxidase-Dependent Generation of Reactive Oxygen Species

Yajie Zhang, Fengping Chen, Jiading Chen, Suqun Huang, Junbin Chen, Jian Huang, Nan Li, Suxia Sun, Xinwei Chu, Longying Zha

Mol Nutr Food Res. 2016 Jul;60(7):1532-43.

PMID: 27005845

Abstract:

Scope:
We and others recently showed that soyasaponin Bb (SSBb ) inhibited lipopolysaccharide (LPS)-induced inflammation in macrophages. Since the recruitment of toll-like receptor 4 (TLR4) into lipid rafts is vital for LPS-initiated signaling, we investigated whether this process would be modulated by SSBb .
Methods and results:
By using sucrose gradient ultracentrifuge, we found that pretreatment of macrophages with SSBb inhibited LPS-induced recruitments of TLR4, myeloid differentiation primary response protein 88 (MyD88) and Toll/IL-1 receptor domain-containing adaptor inducing interferon-β (TRIF) into fractions enriched with lipid rafts marker flotillin-1. We also found SSBb decreased co-localization of TLR4 and lipid rafts by utilizing confocal immunofluorescence microscopy. Additionally, we observed that SSBb suppressed LPS-induced formation of TLR4/MyD88 and TLR4/TRIF complexes, production of pro-inflammatory molecules, and activation of nuclear factor kappa B (NF-κB). Furthermore, we found that these inhibitory effects of SSBb were associated with reduced reactive oxygen species (ROS) because pretreating cells with N-acetyl-L-cysteine and NADPH oxidase inhibitor diphenyleneiodonium (DPI) inhibited LPS-induced TLR4 recruitment into lipid rafts and NF-κB activation. SSBb also inhibited NADPH oxidase activation by blocking interaction between gp91(phox) and p47(phox) similarly as DPI.
Conclusion:
SSBb can inhibit TLR4 recruitment into lipid rafts and its signaling by suppressing the NADPH oxidase-dependent ROS generation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP51330279	Soyasaponin Bb		51330-27-9	Price

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