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Related Experiment Videos

Spontaneous aortic aneurysms in blotchy mice.

E J Andrews, W J White, L P Bullock

    The American Journal of Pathology
    |February 1, 1975
    PubMed
    Summary

    Blotchy mice with defective collagen and elastin cross-linking rapidly develop aortic aneurysms due to elastin breakdown and inflammation. These mice offer a model for studying aneurysm pathogenesis and potential therapeutic targets.

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    Area of Science:

    • Vascular Biology
    • Connective Tissue Disorders
    • Animal Models of Disease

    Background:

    • Aneurysms are complex vascular diseases with multifactorial pathogenesis.
    • Genetic defects in connective tissue components, like collagen and elastin, are implicated in aneurysm formation.
    • The Blotchy (Blo) mouse model possesses a hereditary defect in collagen and elastin cross-linking.

    Purpose of the Study:

    • To investigate the pathogenesis of aneurysm formation in Blotchy (Blo) mice.
    • To characterize the vascular changes associated with the defective cross-linking.
    • To compare the Blo mouse model with other existing aneurysm models.

    Main Methods:

    • Histopathological examination of the aortic wall in Blotchy mice.
    • Age-related analysis of elastin breakdown and inflammatory cell infiltration.
    • Comparison of survival rates between Blo mice with different genetic backgrounds (e.g., Tfm/Y).

    Main Results:

    • Rapid elastin breakdown and replacement by fibroblasts and ground substance were observed early in life.
    • Advanced lesions showed inflammatory cell infiltrates, hemorrhages, and aortic wall rupture.
    • Lesions were concentrated in the thoracic aorta at points of high stress; no lipid or mineral accumulation was found.
    • Androgen-insensitive (Tfm/Y) Blo mice exhibited significantly reduced lifespan compared to other Blo mice.

    Conclusions:

    • The Blotchy mouse is a valuable genetic model for studying aneurysm pathogenesis, particularly the role of elastin degradation.
    • The study highlights the critical role of proper elastin cross-linking in maintaining aortic integrity.
    • Findings suggest potential therapeutic strategies targeting elastin integrity and inflammation in aneurysm disease.

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