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Updated: Nov 24, 2025
Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
Published on: March 18, 2022
DUSP5 suppresses interleukin-1β-induced chondrocyte inflammation and ameliorates osteoarthritis in rats
Zhipeng Wu1, Langhai Xu2, Yuzhe He3
1Department of Orthopaedics, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, China.
Abstract:
Osteoarthritis (OA) is a chronic degenerative joint disease characterized by deterioration of articular cartilage. Dual specificity phosphatase 5 (DUSP5), a member of the DUSP subfamily, is known to regulate cellular inflammation. Here, we studied the relationship between DUSP5 and OA by knockdown and overexpression DUSP5, respectively. Results from in vitro experiments demonstrated that the knockdown of DUSP5 increased interleukin-1β (IL-1β)-induced expression of inflammatory genes, such as inducible nitric oxide synthase (iNOS), cyclooxygenase 2 (COX2), and matrix metalloproteinases (MMPs) in chondrocytes, whereas it decreased the expression of anti-inflammatory genes, such as tissue inhibitor of metalloproteinase 3 (TIMP3) and IL-10. Conversely, the overexpression of DUSP5 suppressed the IL-1β-induced expression of iNOS, COX-2, and MMPs, and upregulated the expression of TIMP3 and IL-10. Moreover, knockdown of DUSP5 enhanced the IL-1β-induced activation of NF-κB and ERK pathways, whereas its overexpression inhibited these pathways. DUSP5 overexpression prevented cartilage degeneration in a rat OA model, while its knockdown reversed that effect. Our findings reveal that DUSP5 suppresses IL-1β-induced chondrocyte inflammation by inhibiting the NF-κB and ERK signaling pathways and ameliorates OA.
Insights
Dual specificity phosphatase 5 (DUSP5) suppresses inflammation in osteoarthritis (OA) by inhibiting key cellular pathways. DUSP5 overexpression protects cartilage, offering a potential therapeutic target for OA.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- Osteoarthritis (OA) is a degenerative joint disease marked by articular cartilage breakdown.
- Dual specificity phosphatase 5 (DUSP5) is implicated in regulating cellular inflammation.
Purpose of the Study:
- To investigate the role of DUSP5 in osteoarthritis pathogenesis.
- To explore the effects of DUSP5 modulation on chondrocyte inflammation and OA progression.
Main Methods:
- In vitro studies involving knockdown and overexpression of DUSP5 in chondrocytes.
- Analysis of inflammatory and anti-inflammatory gene expression (iNOS, COX2, MMPs, TIMP3, IL-10).
- Assessment of NF-κB and ERK signaling pathway activation.
- In vivo experiments using a rat OA model.
Main Results:
- DUSP5 knockdown exacerbated IL-1β-induced inflammation and suppressed anti-inflammatory gene expression.
- DUSP5 overexpression inhibited inflammatory gene expression and upregulated anti-inflammatory markers.
- DUSP5 modulated NF-κB and ERK pathway activation in response to IL-1β.
- DUSP5 overexpression ameliorated cartilage degeneration in a rat OA model, while knockdown worsened it.
Conclusions:
- DUSP5 plays a protective role in osteoarthritis by suppressing IL-1β-induced chondrocyte inflammation.
- DUSP5 exerts its anti-inflammatory effects through the inhibition of NF-κB and ERK signaling pathways.
- DUSP5 represents a potential therapeutic target for mitigating osteoarthritis progression.
