Abstract
Identification of bioactive compounds directly from complex herbal extracts is a key issue in the study of Chinese herbs. The present study describes the establishment and application of a sensitive, efficient, and convenient method based on surface plasmon resonance (SPR) biosensors for screening active ingredients targeting tumor necrosis factor receptor type 1 (TNF-R1) from Chinese herbs. Concentration-adjusted herbal extracts were subjected to SPR binding assay, and a remarkable response signal was observed in Rheum officinale extract. Then, the TNF-R1-bound ingredients were recovered, enriched, and analyzed by UPLC-QTOF/MS. As a result, physcion-8-O-β-d-monoglucoside (PMG) was identified as a bioactive compound, and the affinity constant of PMG to TNF-R1 was determined by SPR affinity analysis (K D = 376 nM). Pharmacological assays revealed that PMG inhibited TNF-α-induced cytotoxicity and apoptosis in L929 cells via TNF-R1. Although PMG was a trace component in the chemical constituents of the R. officinale extract, it had considerable anti-inflammatory activities. It was found for the first time that PMG was a ligand for TNF receptor from herbal medicines. The proposed SPR-based screening method may prove to be an effective solution to analyzing bioactive components of Chinese herbs and other complex drug systems.
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Scheme of the method based on SPR biosensor for screening and recovering active ingredients from complex herbal extracts and UPLC-MS for identifying them. Scheme of the method based on SPR biosensor for screening and recovering active ingredients from complex herbal extracts and UPLC-MS for identifying them
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Abbreviations
- AA:
-
Acetic acid
- FA:
-
Formic acid
- PMG:
-
Physcion-8-O-β-d-monoglucoside
- SPR:
-
Surface plasmon resonance
- TFA:
-
Trifluoro acid
- TNF:
-
Tumor necrosis factor
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 81202496 and 81273472) and grants from the Second Military Medical University (No. 2011QN04).
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Yan Cao, Ying-hua Li and Di-ya Lv contributed equally to this work.
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Cao, Y., Li, Yh., Lv, Dy. et al. Identification of a ligand for tumor necrosis factor receptor from Chinese herbs by combination of surface plasmon resonance biosensor and UPLC-MS. Anal Bioanal Chem 408, 5359–5367 (2016). https://doi.org/10.1007/s00216-016-9633-6
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DOI: https://doi.org/10.1007/s00216-016-9633-6