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PD184352 exerts anti-inflammatory and antioxidant effects by promoting activation of the Nrf2/HO-1 axis
Xiaohang Zheng1, Jianxin Qiu1, Han Zhang1
1Orthopedic Department, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, China; Enze Medical Research Center, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, China.
Abstract:
Osteoarthritis (OA) is a disabling joint disease characterized by cartilage degeneration. Reactive oxygen species (ROS)-induced oxidative stress is an important cause of early chondrocyte death. For this reason, we investigated PD184352, a small molecule inhibitor with potential anti-inflammatory and antioxidant activity. We evaluated the protective effect of PD184352 against destabilized medial meniscus (DMM)-induced OA in mice. The knee joints of the PD184352-treated group had higher Nrf2 expression and milder cartilage damage. Moreover, in in vitro experiments, PD184352 suppressed IL-1β-induced NO, iNOS, PGE2 production, and attenuated pyroptosis. PD184352 treatment promoted antioxidant protein expression and reduced the accumulation of ROS by activating the Nrf2/HO-1 axis. Finally, the anti-inflammatory and antioxidant effects of PD184352 were shown to be partially dependent on Nrf2 activation. Our study reveals the potential role of PD184352 as an antioxidant and provides a new strategy for OA treatment.
Insights
PD184352, an inhibitor, shows promise in treating osteoarthritis (OA) by reducing cartilage damage and inflammation. It acts as an antioxidant, activating the Nrf2/HO-1 pathway to combat oxidative stress in chondrocytes.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Osteoarthritis (OA) is a degenerative joint disease causing cartilage breakdown.
- Oxidative stress from reactive oxygen species (ROS) contributes to early chondrocyte death in OA.
- Developing effective treatments for OA remains a significant medical challenge.
Purpose of the Study:
- To investigate the potential anti-inflammatory and antioxidant effects of PD184352 in osteoarthritis.
- To evaluate the protective role of PD184352 in a mouse model of destabilized medial meniscus (DMM)-induced OA.
- To elucidate the molecular mechanisms underlying PD184352's therapeutic actions, particularly its interaction with the Nrf2 pathway.
Main Methods:
- Administration of PD184352 to mice with DMM-induced OA.
- Assessment of knee joint histology and Nrf2 expression in treated mice.
- In vitro studies using chondrocytes to evaluate the effects of PD184352 on IL-1β-induced inflammatory mediators (NO, iNOS, PGE2) and pyroptosis.
- Analysis of antioxidant protein expression and ROS levels following PD184352 treatment, focusing on the Nrf2/HO-1 axis.
Main Results:
- PD184352 treatment led to milder cartilage damage and increased Nrf2 expression in DMM-induced OA mouse knees.
- In vitro, PD184352 suppressed IL-1β-induced nitric oxide (NO), inducible nitric oxide synthase (iNOS), and prostaglandin E2 (PGE2) production.
- PD184352 treatment attenuated pyroptosis, enhanced antioxidant protein expression, and reduced ROS accumulation via Nrf2/HO-1 activation.
Conclusions:
- PD184352 exhibits significant anti-inflammatory and antioxidant properties relevant to osteoarthritis.
- The therapeutic effects of PD184352 are partially mediated by the activation of the Nrf2 signaling pathway.
- PD184352 represents a potential novel therapeutic strategy for osteoarthritis treatment, targeting oxidative stress and inflammation.
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