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Published on: August 31, 2015
Inhibitory effect of paeoniflorin on methylglyoxal-mediated oxidative stress in osteoblastic MC3T3-E1 cells
Eun Mi Choi1, Kwang Sik Suh2, Sang Youl Rhee3
1Department of Food & Nutrition, Kyung Hee University, 1, Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
Purpose:
Methylglyoxal (MG) has been suggested to be one major source of intracellular reactive carbonyl compounds. In the present study, the effect of paeoniflorin on MG-induced cytotoxicity was investigated using osteoblastic MC3T3-E1 cells.
Methods:
Osteoblastic MC3T3-E1 cells were pre-incubated with paeoniflorin before treatment with MG, and markers of oxidative damage and mitochondrial function were examined.
Results:
Pretreatment of MC3T3-E1 cells with paeoniflorin prevented the MG-induced cell death and formation of intracellular reactive oxygen species, cardiolipin peroxidation, and protein adduct in osteoblastic MC3T3-E1 cells. In addition, paeoniflorin increased glutathione level and restored the activity of glyoxalase I to almost the control level. These findings suggest that paeoniflorin provide a protective action against MG-induced cell damage by reducing oxidative stress and by increasing MG detoxification system. Pretreatment with paeoniflorin prior to MG exposure reduced MG-induced mitochondrial dysfunction by preventing mitochondrial membrane potential dissipation and adenosine triphosphate loss. Additionally, the nitric oxide and nuclear respiratory factor 1 levels were significantly increased by paeoniflorin, suggesting that paeoniflorin may induce mitochondrial biogenesis. Paeoniflorin treatment decreased the levels of proinflammatory cytokines such as TNF-α and IL-6.
Conclusions:
These findings indicate that paeoniflorin might exert its therapeutic effects via upregulation of glyoxalase system and mitochondrial function. Taken together, paeoniflorin may prove to be an effective treatment for diabeteic osteopathy.
Insights
Paeoniflorin protects osteoblastic cells from methylglyoxal (MG) damage by reducing oxidative stress and enhancing detoxification. This suggests paeoniflorin could be a potential treatment for diabetic osteopathy.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Methylglyoxal (MG) is a major source of intracellular reactive carbonyl compounds.
- MG contributes to cellular damage and dysfunction, particularly in conditions like diabetic osteopathy.
Purpose of the Study:
- To investigate the protective effects of paeoniflorin against MG-induced cytotoxicity in osteoblastic MC3T3-E1 cells.
- To elucidate the mechanisms underlying paeoniflorin's protective action, focusing on oxidative stress and detoxification pathways.
Main Methods:
- Osteoblastic MC3T3-E1 cells were pre-treated with paeoniflorin before exposure to MG.
- Assessed markers of oxidative damage, mitochondrial function, glutathione levels, glyoxalase I activity, and inflammatory cytokines.
Main Results:
- Paeoniflorin prevented MG-induced cell death, reactive oxygen species formation, and lipid peroxidation.
- It increased glutathione levels, restored glyoxalase I activity, and improved mitochondrial function (membrane potential, ATP levels).
- Paeoniflorin also promoted mitochondrial biogenesis and reduced pro-inflammatory cytokines (TNF-α, IL-6).
Conclusions:
- Paeoniflorin exerts therapeutic effects by upregulating the glyoxalase system and improving mitochondrial function.
- Paeoniflorin demonstrates potential as an effective treatment for diabetic osteopathy by mitigating MG-induced cellular damage.
