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Updated: Jan 2, 2026
In Vivo Imaging of Reactive Oxygen Species in a Murine Wound Model
Published on: November 17, 2018
KLF2 Protects against Osteoarthritis by Repressing Oxidative Response through Activation of Nrf2/ARE Signaling In
Xiang Gao1, Shuangpeng Jiang1, Zhangzhen Du1
1Department of Orthopedics, The First Hospital of China Medical University, Shenyang 110000, China.
Abstract:
Osteoarthritis (OA) is a multifactorial and inflammatory disease characterized by cartilage destruction that can cause disability among aging patients. There is currently no effective treatment that can arrest or reverse OA progression. Kruppel-like factor 2 (KLF2), a member of the zinc finger family, has emerged as a transcription factor involved in a wide variety of inflammatory diseases. Here, we identified that KLF2 expression is downregulated in IL-1β-treated human chondrocytes and OA cartilage. Genetic and pharmacological overexpression of KLF2 suppressed IL-1β-induced apoptosis and matrix degradation through the suppression of reactive oxygen species (ROS) production. In addition, KLF2 overexpression resulted in increased expression of heme oxygenase-1 (HO-1) and NAD(P)H dehydrogenase quinone 1 (NQO1) through the enhanced nuclear translocation of nuclear factor erythroid 2-related factor 2 (Nrf2). Further, Nrf2 inhibition abrogated the chondroprotective effects of KLF2. Safranin O/fast green and TUNEL staining demonstrated that adenovirus-mediated overexpression of KLF2 in joint cartilage protects rats against experimental OA by inhibiting cartilage degradation and chondrocyte apoptosis. Immunohistochemical staining revealed that KLF2 overexpression significantly decreases MMP13 expression caused by OA progression in vivo. This in vitro and in vivo study is the first to investigate the antioxidative effect and mechanisms of KLF2 in OA pathogenesis. Our results collectively provide new insights into OA pathogenesis regulated by KLF2 and a rationale for the development of effective OA intervention strategies.
Insights
Kruppel-like factor 2 (KLF2) suppresses reactive oxygen species and protects against osteoarthritis progression by inhibiting cartilage and chondrocyte apoptosis. This study reveals KLF2’s antioxidative role in osteoarthritis pathogenesis.
Area of Science:
- Biochemistry
- Molecular Biology
- Pathology
Background:
- Osteoarthritis (OA) is a degenerative joint disease with no effective treatments to halt progression.
- Kruppel-like factor 2 (KLF2) is a transcription factor implicated in inflammatory diseases.
Purpose of the Study:
- To investigate the role and therapeutic potential of KLF2 in osteoarthritis.
- To elucidate the underlying mechanisms of KLF2's protective effects in OA.
Main Methods:
- Downregulation of KLF2 in IL-1β-treated human chondrocytes and OA cartilage was assessed.
- In vitro and in vivo studies utilized genetic and pharmacological KLF2 overexpression.
- Key molecular pathways involving reactive oxygen species (ROS), Nrf2, HO-1, NQO1, and MMP13 were analyzed.
Main Results:
- KLF2 expression was reduced in OA models.
- KLF2 overexpression suppressed IL-1β-induced apoptosis and matrix degradation by reducing ROS.
- KLF2 enhanced Nrf2 nuclear translocation, increasing HO-1 and NQO1, which mediated its chondroprotective effects.
- In vivo, KLF2 overexpression inhibited cartilage degradation and chondrocyte apoptosis in rats with experimental OA, reducing MMP13 expression.
Conclusions:
- KLF2 exhibits significant antioxidative and chondroprotective effects in OA.
- KLF2 acts via the Nrf2/HO-1/NQO1 pathway to mitigate OA pathogenesis.
- KLF2 represents a promising therapeutic target for osteoarthritis intervention.
