Gout Inflammation Time Programming: Molecular Clock from Crystal Triggering to Tissue Remodeling
Abstract
1. Introduction
2. Gout Inflammatory Three-Stage Transformation
2.1. Acute Phase (0–24 h): Crystal Trigger and Outbreak Response
2.2. Transition Phase (24–72 h): Immunometabolic Reprogramming
2.3. Chronic Phase (>72 h): Tissue Memory Formation
2.3.1. Epigenetic Memory Formation
2.3.2. Triad of Osteoarticular Destruction
| Target Tissue | Core Mechanism | Key Effector Molecules/Pathways | Clinical/Imaging Correlation |
|---|---|---|---|
| Cartilage | Chondrocyte Pyroptosis and Matrix Degradation | Gasdermin D, Various Matrix Degrading Enzymes | Double contour sign on US; Cartilage erosion on MRI [30,37,57] |
| Bone | Enhanced Osteoclast Activation | RANKL/RANK/OPG System | Bone erosions and bone marrow edema detectable by DECT/MRI [30,44,69] |
| Tendons/Ligaments | Pathological Calcification, Fibrosis and Tophus Formation | BMP-2, Wnt5a, TGF-β | DECT allows volume quantification of urate deposits; US visualizes tophi and aggregates [29,37,58] |
| Target Tissue | Core Mechanism | Key Effector Molecules/Pathways | Clinical/Imaging Correlation |
3. Treatment Transformation
3.1. Phase-Specific Interventions
3.1.1. Targeted Intervention in the Acute Phase (<24 h)
3.1.2. Key Regulatory Mechanisms During the Transformation Period (24–72 h)
3.1.3. Chronic Phase Tissue Protection (>72 h)
3.2. Frontier Technology
4. Disputes and Prospects
4.1. The Unsolved Mystery: The Underlying Puzzle Revealed by the Model
4.1.1. The Mystery of Disease Resilience: Why Do Some Patients Not Progress to Chronicity
| Mechanism Category | Key Factors/Pathways | Proposed Protective Role | Research Status/Evidence Level |
|---|---|---|---|
| Genetic Buffering | CARD8 loss-of-function variants (e.g., p.C10X) | Disrupts stable NLRP3 inflammasome assembly, reducing IL-1β release. | GWAS-validated; functional studies support [113,114]. |
| IL1RN promoter SNPs | May increase baseline IL-1Ra expression, enhancing feedback inhibition of IL-1 signaling. | Association studies; mechanistic plausibility. | |
| ABCG2/SLC2A9 high-function variants | Promotes urate excretion, reducing intracellular urate load and crystallization risk. | Validated in multiple populations; functionally established [97,114]. | |
| Epigenetic Buffering | Enriched H3K27me3/reduced H3K4me3 at pro-inflammatory gene promoters | Maintains repressive chromatin state, resisting excessive activation by inflammatory signals. | Inferred from epigenomic concepts; analogy to other diseases [116]. |
| Non-coding RNAs (e.g., miR-146a) upregulation | Targets and inhibits signaling nodes (e.g., IRAK1, TRAF6), providing negative feedback. | Preliminary detection in gout; established in RA. | |
| Butyrate via HDAC inhibition | Enhances anti-inflammatory gene expression and suppresses pro-inflammatory cytokines. | Supported byin vitroexperiments [38,39,117]. | |
| Metabolic Buffering | Macrophage metabolic plasticity (rapid glycolysis → OXPHOS switch) | Prevents succinate accumulation, HIF-1α stabilization, and epigenetic dysregulation, favoring timely resolution. | Supported by metabolic flux analyses; pending validation in gout [35,36,61]. |
| Lower serum succinate/α-ketoglutarate ratio | Reflects TCA cycle integrity; may inversely correlate with chronicity risk. | Preliminary metabolomic cohort findings [98,118]. | |
| Systemic Buffering | Gut microbiota-derived butyrate | Promotes Treg differentiation via GPR109A/PPARγ, enhancing immune tolerance. | Animal model support; associative human data [119,120,121,122]. |
| Microbiota-immune axis homeostasis | Maintains systemic inflammatory threshold, reducing risk of excessive sterile inflammation. | Conceptual support; mechanisms require elucidation. |
4.1.2. Gut–Joint Axis: What Is the Precise Mechanism of Remote Regulation
- Metabolite-Mediated Communication: Gut microbiota-derived metabolites act as crucial systemic messengers. A key pathway involves short-chain fatty acids (SCFAs). Reduced levels of anti-inflammatory SCFAs (e.g., butyrate) in gout patients may weaken their inhibitory effects on peripheral immune cells. Butyrate has been shown to suppress MSU crystal-induced cytokine production in human monocytes via inhibition of class I histone deacetylases (HDACs) [2,39]. Conversely, other microbial metabolites may exert pro-inflammatory effects. For instance, succinate, which can be produced by certain gut bacteria, may reach the joint and exacerbate inflammation via the SUCNR1 receptor on macrophages, linking gut metabolism to in situ immunometabolic reprogramming [36,118]. Furthermore, the gut microbiome contributes to the host’s purine and uric acid pool through the metabolism of dietary nucleotides and the expression of microbial uricase, directly influencing hyperuricemia [124,125].
- Systemic Immune Cell Training: Microbial components or metabolites may systemically “train” innate immune cells, altering their baseline state and subsequent response to MSU crystals. This aligns with the broader concept of “trained immunity” [51]. For example, systemic exposure to microbial ligands may prime bone marrow myeloid precursors, leading to neutrophils with a heightened propensity for NETosis or monocytes/macrophages with a lower activation threshold upon encountering crystals [9,126]. This could explain the “hyper-responsive” phenotype observed in some gout patients.
- Barrier Integrity and Antigenic Mimicry: Intestinal dysbiosis is often associated with increased gut permeability (“leaky gut”). This may facilitate the translocation of microbial products (e.g., lipopolysaccharide, LPS) into the circulation, contributing to a low-grade systemic inflammatory state that could lower the threshold for acute gout flares [127]. A more speculative hypothesis involves molecular mimicry, where immune responses primed against gut microbial antigens cross-react with structurally similar components in joint tissues, potentially contributing to chronic synovitis [110].
- Future Imperative: Disentangling this complex axis requires an integrated multi-omics approach. Future studies should concurrently analyze the gut metagenome, serum metabolome (particularly microbial metabolites), and synovial immunome from the same patients across disease phases to move from association to causal understanding [51,106,118].
4.2. Future Directions: TOWARD Precision Prevention and Treatment
4.2.1. Spatiotemporal Multi-Omics Integration Analysis
4.2.2. Precision Stratification in Clinical Trial Enrollment
4.3. Limitations of the Current Evidence and the Temporal Programming Model
5. Summary
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
| MSU | monosodium urate |
| NLRP3 | NOD-like receptor thermal protein domain associated protein 3 |
| ROS | reactive oxygen species |
| IL-1β | interleukin-1β |
| NETs | neutrophil extracellular traps |
| TLR4 | Toll-like receptors 4 |
| MYD88 | Myeloid Differentiation Primary Response 88 |
| ASICs | acid-sensing ion channels |
| SYK | Spleen tyrosine kinase |
| MRGPRX2 | Mas-related G protein-coupled receptor member X2 |
| STING | stimulator of interferon genes |
| ASC | apoptosis-associated speck-like protein containing a CARD |
| NETosis | neutrophil extracellular trap |
| MPO-HOCl | myeloperoxidase-hypochlorous acid |
| NAD | Nicotinamide Adenine Dinucleotide |
| SIRT1 | silent information regulator 1 |
| NF-κB | nuclear factor kappa-B |
| HDACs | histone deacetylases |
| CD39 | Ectonucleoside triphosphate diphosphohydrolase-1 |
| FLSs | Fibroblast-like synoviocytes |
| SQSTM1/p62 | Sequestosome 1 |
| mTORC1 | Mechanistic Target of Rapamycin Complex 1 |
| GAS | gout activity score |
| HDL-C | High density lipoprotein cholesterol |
| NUMB | NUMB endocytic adaptor protein |
| ABCG2 | ATP binding cassette subfamily G member 2 Gene |
| TNF-α | tumor necrosis factor-α |
| IL-6 | interleukin-6 |
| H3K4me3 | Tri-methylation of lysine 4 on histone H3 |
| H3K27ac | H3 K27 acetylation |
| ox-LDL | oxidized low-density lipoprotein |
| hs-CRP | high-sensitivity C-reactive protein |
| TADs | topologically associating domains |
| NFIL3 | nuclear factor, interleukin 3 regulated Gene |
| REDD1 | Regulated in Development and DNA Damage Response 1 |
| mTOR | mammalian target of rapamycin |
| MRI | magnetic resonance imaging |
| RANKL | Tumor necrosis factor ligand superfamily member 11 |
| RANK | Tumor necrosis factor receptor superfamily member 11A |
| OPG | osteoclastogenesis inhibitory factor |
| BMP-2 | Bone Morphogenetic Protein 2 |
| DECT | Dual Energy Computed Tomography |
| WNT5A | Wnt family member 5A Gene |
| TGF-β | Transforming growth factor beta |
| T2T | treat-to-target |
| ROS-NLRP3 | reactive oxygen species- NOD-like receptor thermal protein domain associated protein 3 |
| MitoQ | Mitoquinone mesylate |
| PAD4 | peptidylarginine deiminase 4 |
| GSK484 | peptidyl arginine deiminase 4 inhibitors |
| AMPK | Adenosine 5′-monophosphate (AMP)-activated protein kinase |
| MPC | mitochondrial pyruvate carrier |
| MLT-MLP | macrophage membrane-coated melatonin-loaded liposomes |
| SUCNR1 | succinate receptor |
| BET | Bromodomain and extraterminal |
| JQ1 | BET protein inhibitor |
| UMOD | uromodulin |
| CT | computed tomography |
| CARD8 | caspase recruitment domain family member 8 Gene |
| TNF | tumor necrosis factor domains |
| SCFAs | short-chain fatty acids |
| TGF-β1 | Transforming Growth Factor β1 |
| COMP | artilage oligomeric matrix protein |
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| Target | Intervention | Mechanism | Example Agent |
|---|---|---|---|
| SYK Kinase | Inhibitor | Blocks proximal signal transduction following crystal recognition | Fostamatinib |
| Mitochondrial ROS | Scavenger | Inhibits NLRP3 activation | MitoQ |
| NETosis | PAD4 inhibitor | Prevents histone citrullination | GSK484 |
| IL-1β | Inhibitor delivery | Localized cytokine blockade | ROS-hydrogel/IL-1β inhibitor |
| Target | Intervention | Mechanism | Example Agent |
|---|---|---|---|
| Macrophage Glycolysis | AMPK activator | Shifts M1 → M2 metabolism | Metformin |
| Succinate/SUCNR1 | Antagonist | Blocks inflammatory memory | SUCNR1 antagonist |
| Autophagy Flux | Inducer | Clears p62, inhibits mTORC1/fibrosis | Tat-Beclin1 peptide |
| Strategy Type | Target | Intervention | Mechanism | Example Agent |
|---|---|---|---|---|
| Epigenetic Modulation | BET proteins | Inhibitor | Resets proinflammatory chromatin | JQ1 |
| Stem Cell Protection | Wnt5a signaling | Monoclonal antibody | Blocks ectopic osteogenesis | Anti-Wnt5a mAb |
| Urate Excretion | ABCG2 pathway | Corrective therapy | Enhances uric acid clearance | Under development |
| Phenotype | Defining Biomarkers/Criteria | Potential Targeted Therapy |
|---|---|---|
| Metabolic Dysregulation | Elevated succinate/lactate; dysregulated nicotinamide metabolism | SUCNR1 antagonists, AMPK activators |
| High Fibrosis Risk | High COMP; DECT urate volume; mTORC1 activation | Autophagy inducers, anti-fibrotics |
| Epigenetic Dysregulation | High H3K4me3/H3K27ac; UMOD hypermethylation | BET inhibitors, HDAC inhibitors |
| Acute Inflammatory | High IL-1β, IL-6, neutrophil count | NLRP3 inhibitors, NETosis blockers |
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© 2026 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
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Chen, X.; Zhang, C.; Zheng, H.; Shi, Q.; Chen, B.; Han, J. Gout Inflammation Time Programming: Molecular Clock from Crystal Triggering to Tissue Remodeling. Int. J. Mol. Sci. 2026, 27, 1523. https://doi.org/10.3390/ijms27031523
Chen X, Zhang C, Zheng H, Shi Q, Chen B, Han J. Gout Inflammation Time Programming: Molecular Clock from Crystal Triggering to Tissue Remodeling. International Journal of Molecular Sciences. 2026; 27(3):1523. https://doi.org/10.3390/ijms27031523
Chicago/Turabian StyleChen, Xin, Chunyuan Zhang, Hanwen Zheng, Qingping Shi, Beiyan Chen, and Jieru Han. 2026. "Gout Inflammation Time Programming: Molecular Clock from Crystal Triggering to Tissue Remodeling" International Journal of Molecular Sciences 27, no. 3: 1523. https://doi.org/10.3390/ijms27031523
APA StyleChen, X., Zhang, C., Zheng, H., Shi, Q., Chen, B., & Han, J. (2026). Gout Inflammation Time Programming: Molecular Clock from Crystal Triggering to Tissue Remodeling. International Journal of Molecular Sciences, 27(3), 1523. https://doi.org/10.3390/ijms27031523

