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Menadione-induced cytotoxicity to rat osteoblasts
J S Sun1, Y H Tsuang, W C Huang
1Department of Orthopedic Surgery, National Taiwan University Hospital, Taipei, ROC.
Cellular and Molecular Life Sciences : CMLS
|February 3, 1998
Summary
Menadione induces oxidative stress and apoptosis in osteoblasts by increasing reactive oxygen species. Antioxidants like catalase protect against this damage, highlighting oxidative stress
Area of Science:
- Cell Biology
- Biochemistry
- Toxicology
Background:
- Oxygen-derived free radicals contribute to various cytopathic conditions.
- Osteoblasts are susceptible to oxidative damage, impacting bone health.
Purpose of the Study:
- To investigate the effects of menadione-induced oxidative stress on osteoblasts.
- To elucidate the role of reactive oxygen species in osteoblast apoptosis.
Main Methods:
- In vitro culture of osteoblasts with menadione.
- Measurement of oxidative stress using chemiluminescence and tetrazolium assays.
- Assessment of apoptosis via Annexin V staining and TUNEL assay.
Main Results:
- Menadione exposure induced oxidative stress in osteoblasts, evidenced by superoxide and hydrogen peroxide production.
- Catalase and dimethyl sulfoxide demonstrated protective effects against menadione-induced cytotoxicity.
- Menadione-treated osteoblasts showed increased Annexin V binding and positive TUNEL staining, indicating apoptosis.
Conclusions:
- Menadione triggers reactive oxygen species production, leading to osteoblast apoptosis.
- Targeting oxidative stress pathways may offer therapeutic strategies for bone-related conditions.