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Development of heart and aortic lesions in DBA/2NCrj mice
Abstract:
The development of heart and aortic lesions was investigated in 3- to 8-week-old DBA/2NCrj mice. In the heart, small foci of myocardial calcification and severe calcification with subsequent inflammation were observed. Severe lesions were restricted to the myocardium below the right ventricular epicardium. Small foci of myocardial calcification were found from 4 to 8 weeks of age with almost the same frequency. The incidence of severe calcification showed a drastic increase between 6 and 7 weeks of age. Aortic lesions were observed from 3 weeks of age and characterized by focal calcification of the smooth muscle cells and elastic laminae. The frequency of aortic calcification was about 50% and not age-related.
Insights
This study observed heart and aortic calcification in young DBA/2NCrj mice. Severe myocardial calcification increased significantly between 6 and 7 weeks, while aortic calcification occurred frequently and was not age-dependent.
Area of Science:
- Cardiovascular Research
- Mouse Models
- Pathology
Background:
- Vascular calcification is a significant health concern.
- Understanding early lesion development is crucial for prevention.
- DBA/2NCrj mice are a relevant model for studying cardiovascular pathologies.
Purpose of the Study:
- To investigate the development and characteristics of heart and aortic lesions in young DBA/2NCrj mice.
- To determine the age-related incidence and severity of myocardial and aortic calcification.
- To characterize the histological features of observed lesions.
Main Methods:
- Histopathological examination of heart and aortic tissues from DBA/2NCrj mice aged 3 to 8 weeks.
- Macroscopic and microscopic analysis to identify and quantify calcific lesions.
- Age-specific incidence rates were calculated for both myocardial and aortic calcification.
Main Results:
- Myocardial calcification, ranging from small foci to severe lesions with inflammation, was observed.
- Severe myocardial lesions were localized below the right ventricular epicardium.
- Aortic lesions, characterized by smooth muscle cell and elastic lamina calcification, were present from 3 weeks of age in approximately 50% of mice, independent of age.
- A significant increase in severe myocardial calcification incidence occurred between 6 and 7 weeks of age.
Conclusions:
- DBA/2NCrj mice exhibit distinct patterns of early heart and aortic calcification.
- The rapid increase in severe myocardial calcification between 6 and 7 weeks suggests a critical developmental window.
- Aortic calcification in this model is prevalent and not influenced by age within the studied period.