Unveiling the mechanisms of American ginseng and achyranthes in treatment of primary Sjogren's syndrome via mtDNA-cGAS-STING pathway insights from network pharmacology, molecular dynamics, and experimental validation.

OBJECTIVE: With the aim of clarifying the therapeutic mechanisms of the American Ginseng-Achyranthes bidentata (AG&A) herbal pair in primary Sjögren's syndrome (pSS), this study employs an integrated approach combining network pharmacology, molecular docking, molecular dynamics simulations, and animal experiments.

METHODS: Network pharmacology & LC-MS/MS was utilized to identify the active components and potential targets of A&A. Molecular docking and dynamics simulations were performed to evaluate binding affinity and complex stability with key targets. Animal experiments using non-obese diabetic (NOD) mice were conducted to validate symptom improvement by critical active components.

RESULTS: Network pharmacology identified baicalin and quercetin as key active components. Molecular docking revealed strong binding affinities (binding energy ≤ -8.0 kcal/mol) between these compounds and apoptosis-related proteins, BAX and CASP3. Molecular dynamics simulations confirmed the stability of these complexes. Animal experiments demonstrated that baicalin can significantly reduce inflammatory cytokines of IL-18, TNF-α, IFN-α, and IFN-β,CXCL-10 (p < 0.05), decrease mtDNA release, and downregulate cGAS-STING pathway-related proteins including cGAS, STING, CASP3, ZBP1, TBK1, p-STING, p-TBK1, IRF3, p-IRF3 and BAX.

CONCLUSION: The critical components baicalin and quercetin from AG&A, particularly in aqueous extracts, exhibit therapeutic efficacy against pSS. This study provides experimental evidence for their action mechanism through modulating the mtDNA-cGAS-STING pathway. While highlighting their therapeutic potential, additional in vivo and clinical studies are warranted to validate these findings.