TCM and related active compounds in the treatment of gout: the regulation of signaling pathway and urate transporter

Gout is a painful form of arthritis caused by the accumulation of monosodium urate crystals in the joints, resulting from elevated levels of uric acid in the blood. This comprehensive review analyzes how Traditional Chinese Medicine (TCM) offers promising alternatives for the treatment of this debilitating condition. The researchers compiled evidence from the last five years from electronic databases such as PubMed, Web of Science, and CNKI, focusing specifically on the molecular mechanisms by which Chinese medicinal herbs exert their anti-gout effects. The methodology involved a systematic analysis of studies that investigated both individual medicinal plants and traditional compound formulas, examining their effects in cellular and animal models.

The results reveal that TCM acts through multiple interconnected molecular pathways. The main signaling pathways identified include MAPK, NF-κB, PI3K/Akt, NLRP3, and JAK/STAT, all crucial in the regulation of the inflammatory response and uric acid metabolism. Particularly noteworthy is the role of the NLRP3 pathway, which when activated by urate crystals triggers an inflammatory cascade. Compounds such as scutellarin, tetrahydropalmatine, and berberine have demonstrated the capacity to inhibit this pathway, significantly reducing joint inflammation.

The NF-κB pathway, considered a key intermediary in inflammation, has also been shown to be effectively modulated by compounds such as paeonol, icariin, and curcumin. These compounds prevent the degradation of inhibitory proteins and reduce the expression of pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6. Equally important is the finding that TCM affects uric acid transporters, including URAT1, GLUT9, and ABCG2, which are responsible for the reabsorption and excretion of uric acid in the kidneys and intestines. Medicines such as berberine, naringin, and chlorogenic acid have demonstrated the capacity to modulate these transporters, promoting greater uric acid excretion and preventing its accumulation.

The clinical implications of these findings are significant. Unlike conventional medications that frequently cause gastrointestinal side effects, skin rashes, and potential renal dysfunction, TCM-based therapies offer a multi-target approach with lower toxicity. Traditional formulas such as Simiao San, Wuling San, and several others have demonstrated efficacy in both the prevention and treatment of acute gout flares. The study also highlights the importance of metabolomics research to better understand the mechanisms of action.

The interaction between metabolites and receptors offers new avenues to investigate potential therapeutic targets and the regulatory role of TCM within signaling pathways. Particularly interesting is the involvement of purine metabolism, where purinergic receptors such as P2X7 and P2Y modulate immune and inflammatory responses. Despite the promising results, the review identifies several important limitations. Most of the studies were conducted in cellular and animal models, with a need for more clinical research to confirm efficacy in humans.

In addition, interspecies differences may mean that some therapeutic effects observed in the laboratory do not translate directly to human applications. The variability in the quality and standardization of plant extracts also represents a challenge for the reproducibility of results. The future of research in this area points to the need for more robust clinical studies that investigate specific biomarkers and target proteins involved in the pathogenesis of gout. The integration of metabolomic approaches with traditional pharmacological validation promises to reveal new insights into the underlying mechanisms and potential therapeutic targets.

This holistic approach, characteristic of TCM, which aims at both the reduction of inflammation and the improvement of uric acid excretion, offers a unique and valuable perspective for the management of gout, complementing or potentially replacing conventional therapies with a superior safety profile.