Relationship between oxidative stress and cardiomyopathic changes in ovariectomized rats

Area of Science:

• Cardiovascular Science
• Reproductive Biology
• Biochemistry

Background:

• Menopause negatively impacts cardiovascular function, but its effects on cardiac ultrastructure and underlying pathophysiology remain unclear.
• Understanding menopause-related cardiac changes is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate the overall effect of menopause on cardiac ultrastructure and pathophysiology using an experimental animal model.
• To explore the role of oxidative stress in menopause-induced cardiac alterations.

Main Methods:

• Ovariectomy was performed on 12-week-old female Sprague Dawley rats, creating a menopausal model.
• Cardiac tissues were analyzed for histopathological changes and levels of key oxidative and antioxidant markers.
• Enzymes assessed included catalase (CAT), superoxide dismutase (SOD), myeloperoxidase (MPO), glutathione (GSH), and lipid peroxidation (LPO).

Main Results:

• Ovariectomy led to significant cardiomyopathic changes compared to the control group.
• Increased activities of CAT, SOD, and MPO, along with elevated LPO levels, were observed in the ovariectomy group.
• Significantly lower GSH levels were found in the ovariectomy group, indicating reduced antioxidant capacity.

Conclusions:

• Menopause, induced by ovariectomy in rats, causes cardiomyopathic changes.
• Oxidative stress is proposed as the mediating mechanism for these menopause-induced cardiac alterations.
• This study provides experimental evidence linking menopause, oxidative stress, and cardiac dysfunction.