Related Experiment Videos
Pyrroloquinoline Quinone Decelerates Rheumatoid Arthritis Progression by Inhibiting Inflammatory Responses and Joint
Zhongbing Liu1, Chi Sun1, Ran Tao1
1Department of Orthopaedics, Affiliated Hospital of Nantong University, and Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target, Nantong University, Nantong, 226001, China.
Abstract:
Pyrroloquinoline quinone (PQQ) is a naturally occurring redox cofactor that acts as an essential nutrient and antioxidant and has been reported to exert potent immunosuppressive effects. However, the therapeutically potential of PQQ on rheumatoid arthritis (RA) has not been explored. In the present study, the anti-inflammatory effects of PQQ were investigated in interleukin (IL)-1β-treated SW982 cells, a RA-like fibroblast-like synoviocytes (FLSs) injury model. Our observations showed that pretreatment with PQQ significantly inhibited the expression of matrix metalloproteinase (MMP)-1 and MMP-3 and suppressed the production of proinflammatory mediators such as TNF-α and IL-6 in IL-1β-treated SW982 cells. The nuclear translocation of nuclear factor kappa B (NF-κB) and the phosphorylation level of p65, p38, and JNK MAP kinase pathways were also inhibited by PQQ in IL-1β-stimulated SW982 cells. To further confirm the therapeutic effects of PQQ on RA in vivo, a collagen-induced arthritis (CIA) model was used. Mice treated with PQQ demonstrated marked attenuation of arthritic symptoms based on histopathology and clinical arthritis scores. These results collectively suggested that PQQ might be a promising therapeutic agent for alleviating the progress of RA.
Related Concept Videos
Gene Regulation in Microbial Communities: Quorum Sensing
Inflammatory Response
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
NF-κB-dependent Signaling Pathway
NF-κB-dependent Signaling Mechanism
The...
Inflammatory Bowel Disease IV: Pharmacological Management
Pharmacologic...
T Cell Types and Functions
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...