Scutellarein Ameliorated Chondrocyte Inflammation and Osteoarthritis in Rats

Shao-ze Jing, Shu-han Yang, Yun-kun Qu, Hai-hu Hao, Hua Wu

Current Medical Science ›› 2024, Vol. 44 ›› Issue (2) : 355-368.

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Current Medical Science ›› 2024, Vol. 44 ›› Issue (2) : 355-368. DOI: 10.1007/s11596-024-2854-6
Original Article

Scutellarein Ameliorated Chondrocyte Inflammation and Osteoarthritis in Rats

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Abstract

Objective

Osteoarthritis (OA) is a degenerative joint disorder characterized by the gradual degradation of joint cartilage and local inflammation. This study aimed to investigate the anti-OA effect of scutellarein (SCU), a single-unit flavonoid compound obtained from Scutellaria barbata D. Don, in rats.

Methods

The extracted rat chondrocytes were treated with SCU and IL-1β. The chondrocytes were divided into control group, IL-1β group, IL-1β+SCU 50 µmol/L group, and IL-1β+SCU 100 µmol/L group. Morphology of rat chondrocytes was observed by toluidine blue and safranin O staining. CCK-8 method was used to detect the cytotoxicity of SCU. ELISA, qRT-PCR, Western blotting, immunofluorescence, SAβ-gal staining, flow cytometry, and bioinformatics analysis were applied to evaluate the effect of SCU on rat chondrocytes under IL-1β intervention. Additionally, anterior cruciate ligament transection (ACL-T) was used to establish a rat OA model. Histological changes were detected by safranin O/fast green, hematoxylin-eosin (HE) staining, and immunohistochemistry.

Results

SCU protected cartilage and exhibited anti-inflammatory effects via multiple mechanisms. Specifically, it could enhance the synthesis of extracellular matrix in cartilage cells and inhibit its degradation. In addition, SCU partially inhibited the nuclear factor kappa-B/mitogen-activated protein kinase (NF-κB/MAPK) pathway, thereby reducing inflammatory cytokine production in the joint cartilage. Furthermore, SCU significantly reduced IL-1β-induced apoptosis and senescence in rat chondrocytes, further highlighting its potential role in OA treatment. In vivo experiments revealed that SCU (at a dose of 50 mg/kg) administered for 2 months could significantly delay the progression of cartilage damage, which was reflected in a lower Osteoarthritis Research Society International (OARSI) score, and reduced expression of matrix metalloproteinase 13 (MMP13) in cartilage.

Conclusion

SCU is effective in the therapeutic management of OA and could serve as a potential candidate for future clinical drug therapy for OA.

Keywords

scutellarein / osteoarthritis / apoptosis / mitogen-activated protein kinase (MAPK) / nuclear factor kappa-B (NF-κB)

Cite this article

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Shao-ze Jing, Shu-han Yang, Yun-kun Qu, Hai-hu Hao, Hua Wu. Scutellarein Ameliorated Chondrocyte Inflammation and Osteoarthritis in Rats. Current Medical Science, 2024, 44(2): 355‒368 https://doi.org/10.1007/s11596-024-2854-6
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