Characterization of aortic endothelial dysfunction in ovariectomized allergic asthmatic mice

Area of Science:

• Cardiovascular Research
• Pulmonary Medicine
• Endocrinology

Background:

• Clinical observations suggest sex hormones influence cardiovascular disease (CVD) in women with asthma.
• The underlying mechanisms connecting sex hormones, asthma, and CVD remain unclear.

Purpose of the Study:

• To investigate the impact of ovariectomy (OVX) on asthma severity and vascular reactivity in a mouse model.
• To determine if the absence of sex hormones exacerbates asthma-related cardiovascular effects.

Main Methods:

• Female C57/BL6 mice were divided into four groups: sham vehicle control, OVX vehicle control, sham asthma, and OVX asthma.
• Asthma was induced using ovalbumin sensitization and aerosol challenges.
• Lung eosinophil counts, plasma anti-IgE levels, bronchoalveolar lavage fluid cytokines, and acetylcholine-induced aortic relaxation were measured.

Main Results:

• OVX asthma mice exhibited significantly higher lung eosinophil counts and plasma anti-IgE levels compared to sham asthma mice.
• Elevated cytokines were observed in bronchoalveolar lavage fluids of OVX asthma mice.
• Aortic relaxation was reduced in both sham and OVX asthma groups, with no significant difference between them, indicating impaired endothelial function.

Conclusions:

• Ovariectomy exacerbates allergic lung responses in asthmatic mice.
• Lung-initiated inflammation in asthma can negatively impact aortic endothelial function, potentially contributing to cardiovascular risks.
• These findings highlight a potential role for sex hormones in modulating asthma's cardiovascular consequences.