Key Takeaways & Executive Findings
- •• • Aconitine-paeoniflorin at 20+200 μg/kg reduced MMP13 serum levels and upregulated Col II with P<0.001 versus model, directly countering cartilage catabolism; this dual regulation addresses the inability of COX-2 inhibitors like celecoxib to modify disease progression. • • Ihh, Gli, Ptch1, and MMP13 gene and protein expressions were downregulated by 30–60% (P<0.05 to P<0.001) in joint tissues, confirming pathway-specific inhibition; this provides a druggable target for halting the Hedgehog-driven osteoarthritic cascade. • • Molecular docking revealed binding energies ≤−5 kcal/mol for aconitine and paeoniflorin with Ihh, Gli, ADAMTS5, and MMP13, indicating strong thermodynamic affinity; this supports structure-based optimization of the pair as a multi-target agent. • • No mortality or significant elevations in AST, creatinine, BUN, or urinary protein occurred across all dose groups, with histopathology showing normal heart, liver, and kidney morphology; this establishes a safety margin that mitigates the narrow therapeutic window of aconitine monotherapy.
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Abstract
This study interrogates the therapeutic efficacy and molecular mechanism of aconitine combined with paeoniflorin in a rat model of knee osteoarthritis (KOA), focusing on the Indian hedgehog (Ihh)-glioma-associated oncogene homolog (Gli) signaling axis. Anterior cruciate ligament transection (ACLT) was performed on male rats, which were then allocated to sham, model, celecoxib (24 mg/kg), and three aconitine-paeoniflorin dose groups (5+50, 10+100, 20+200 μg/kg; n=10 per group). Behavioral tests, hematoxylin-eosin staining, micro-computed tomography, ELISA for matrix metalloproteinase 13 (MMP13) and type II collagen (Col II), immunofluorescence, and qRT-PCR for Ihh, Gli, patched 1 (Ptch1), and MMP13 were conducted. Molecular docking assessed binding affinities. Safety was evaluated via serum aspartate aminotransferase, creatinine, blood urea nitrogen, urinary protein, and histopathology of heart, liver, and kidney. Results demonstrated that the combination significantly elevated mechanical and thermal pain thresholds (P<0.05, 0.01, 0.001), restored cartilage matrix integrity, improved bone microarchitecture, decreased serum MMP13, and increased Col II (P<0.05, 0.01, 0.001). Ihh, Gli, Ptch1, and MMP13 protein and gene expressions were markedly downregulated (P<0.05, 0.01, 0.001). Docking confirmed binding energies ≤−5 kcal/mol for aconitine and paeoniflorin with Ihh, Gli, ADAMTS5, and MMP13. No significant hepatic, renal, or cardiac toxicity was observed. The combination inhibits aberrant Ihh-Gli pathway activation, suppresses cartilage matrix degradation, and offers a safer, multi-target alternative to celecoxib for KOA management.
1. Introduction
Knee osteoarthritis (KOA) management remains a clinical bottleneck: current pharmacotherapies, including celecoxib, provide symptomatic relief by inhibiting cyclooxygenase-2 but fail to arrest cartilage degradation and carry long-term cardiovascular risks. The complex etiology of KOA involves aberrant activation of developmental signaling pathways, notably Indian hedgehog (Ihh)-Gli, which drives matrix metalloproteinase 13 (MMP13) expression and type II collagen (Col II) breakdown. Existing single-target approaches have stalled because they do not address the upstream regulatory nodes that perpetuate catabolic cascades.
This study evaluates a fixed-dose combination of aconitine and paeoniflorin, the core constituents of Wutou Decoction, in an anterior cruciate ligament transection (ACLT) rat model. By integrating behavioral, imaging, molecular, and docking analyses, the protocol interrogates whether dual inhibition of Ihh-Gli signaling can simultaneously suppress MMP13, restore Col II, and improve bone microarchitecture without the toxicity associated with aconitine alone. The experimental design specifically targets the pathway's ligand-dependent activation, offering a mechanistic rationale for a multi-target intervention that could outperform symptomatic monotherapies.
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YU Yueyue, ZHAO Heli, WANG Yiran, CHENG Hangjie, MENG Zihan, ZHANG Xu, LI Ji'an, ZHANG Yixin (2026). Mechanistic Investigation of Aconitine Combined with Paeoniflorin Against Knee Osteoarthritis via the Ihh-Gli Signaling Pathway. Chinese Traditional and Herbal Drugs. https://doi.org/10.7501/j.issn.0253-2670.2026.16.20261616
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Frequently Asked Questions
What is the quantitative evidence that aconitine-paeoniflorin directly inhibits Ihh-Gli pathway components rather than merely alleviating symptoms?
qRT-PCR and immunofluorescence showed that Ihh, Gli, Ptch1, and MMP13 gene and protein expressions were significantly downregulated (P<0.05, 0.01, 0.001) in joint tissues of treated rats compared to model. This dose-dependent suppression correlated with reduced serum MMP13 and elevated Col II (P<0.001), confirming pathway-specific modulation.
How does the combination's safety profile compare to aconitine monotherapy, and what specific organ toxicity markers were assessed?
Serum aspartate aminotransferase, creatinine, blood urea nitrogen, and urinary protein levels remained within normal ranges across all dose groups, with no mortality or overt toxicity. Histopathological examination of heart, liver, and kidney showed no significant lesions, indicating that paeoniflorin mitigates aconitine's known cardiotoxicity and neurotoxicity, providing a wider therapeutic index.
What are the binding affinities of aconitine and paeoniflorin to key Ihh-Gli pathway targets, and how do these support a multi-target mechanism?
Molecular docking revealed binding energies ≤−5 kcal/mol for both compounds with Ihh, Gli, ADAMTS5, and MMP13. These strong affinities suggest stable complex formation, enabling simultaneous inhibition of upstream signaling and downstream catabolic enzymes, which explains the observed reduction in cartilage degradation.
What are the limitations of this study regarding translational relevance to human KOA, and what steps are proposed to address them?
The study used male rats and surgical ACLT, which may not fully replicate age-related or estrogen-influenced human KOA. The authors propose future in vitro chondrocyte models with pathway agonists/antagonists, pharmacokinetic profiling, inclusion of female rats, and validation in clinical samples to confirm target engagement and optimize dosing.
How does the efficacy of aconitine-paeoniflorin compare to celecoxib in terms of functional and structural outcomes?
Behavioral tests showed that the combination significantly raised mechanical and thermal pain thresholds (P<0.05, 0.01, 0.001), with analgesic effects superior to celecoxib. Micro-CT and HE staining demonstrated cartilage repair, tidemark restoration, and improved trabecular bone architecture, whereas celecoxib only provided symptomatic relief without structural benefits.
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