[Mechanism of Tianhe Zhuifeng Ointment in treating rheumatoid arthritis with syndrome of internal obstruction and cold-dampness and compatibility principles based on "disease-syndrome-formula" association network].

This study aims to explore the mechanism of Tianhe Zhuifeng Ointment in treating rheumatoid arthritis(RA) with syndrome of internal obstruction and cold-dampness and the compatibility characteristics based on the "disease-syndrome-formula" association network. A gene set associated with the clinical symptoms of RA was collected from Integrative Pharmacology-based Research Platform of Traditional Chinese Medicine v2.0(TCMIP v2.0). The different expression gene set of RA with syndrome of internal obstruction and cold-dampness was screened out by transcriptomic expression profile detection and bioinformatics data mining of the comparison of RA patients with syndrome of internal obstruction and cold-dampness and healthy volunteers. The chemical composition information of 35 Chinese medicines from Tianhe Zhuifeng Ointment was collected from TCMIP v2.0 and Traditional Chinese Medicine Bank(TCMBank). The candidate targets were predicted based on the similarity principle of compounds structure. The interactive network of "related gene of RA with syndrome of internal obstruction and cold-dampness-candidate target of Tianhe Zhuifeng Ointment" was constructed. The core network targets were screened out by topological characteristics of calculating network, and the functional exploration was carried out based on Kyoto Encyclopedia of Genes and Genomes(KEGG) and Reactome Pathway Database. The compatibility mechanisms of various efficacy groups of Tianhe Zhuifeng Ointment were further explored. The results showed that the candidate targets of Tianhe Zhuifeng Ointment were mainly involved into the modules of "immune-inflammation" regulation, nervous system function, cell function, and substance and energy metabolism, etc. The mechanisms of various efficacy groups emphasized on different aspects. The group of dispelling wind and removing dampness-dredging channels and activating collaterals, the group of extinguishing wind and stopping convulsions, and the group of pungent analgesia regulated "immune-inflammation" system by warming meridians and dissipating cold. The group of activating blood and resolving stasis and the group of strengthening sinews and bones regulated "immune-inflammation" system by activating blood and dredging channels. The group of dispelling wind and removing dampness-dredging channels and activating collaterals, the group of extinguishing wind and stopping convulsions, the group of activating blood and resolving stasis, the group of strengthening sinews and bones, and the group of clearing heat and draining water affected the nervous system by invigorating Qi-blood and benefiting spirit. The group of dispelling wind and removing dampness-dredging channels and activating collaterals and the group of extinguishing wind and stopping convulsions regulated cell function and substance and energy metabolism by dispelling wind and eliminating cold-dampness. The group of activating blood and resolving stasis and the group of strengthening sinews and bones regulated the cell function and substance and energy metabolism by activating blood and strengthening sinews and bones. The results showed that Tianhe Zhuifeng Ointment exerted the comprehensive efficacy of dispelling wind, removing dampness, activating blood, removing stasis, warming meridians, dredging channels, and strengthening sinews and bones through adjusting the imbalance of "immune-inflammation", regulating nervous system, cell function, and interfering with substance and energy metabolism, thus improving the syndrome of internal obstruction and cold-dampness. The findings of this study laid foundations for clarifying the therapeutic characteristics and clinical orientation of Tianhe Zhuifeng Ointment.