cardiovascular system
• aortas of mice at 6 and 9 months of age show patchy presence of proteoglycans and disorganization of elastin in the extracellular matrix
• however, young mice do not exhibit a defect in elastic fiber formation
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• nuclei in aortic tissue exhibit a more significant degree of DNA degradation at 6 months of age
• at 9 months of age, a decrease in the number of smooth muscle cell nuclei is seen, indicating loss of smooth muscle cell tissue with age
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• sinus of Valsalva dilation
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• mice show an increase in aortic diameter (sinus of Valsalva, ascending aorta, aortic arch, descending aorta) at 6, 8, and 12 months of age
• aortic diameters increase more with time than in wild-type mice
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muscle
• nuclei in aortic tissue exhibit a more significant degree of DNA degradation at 6 months of age
• at 9 months of age, a decrease in the number of smooth muscle cell nuclei is seen, indicating loss of smooth muscle cell tissue with age
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mortality/aging
N |
• mice have a normal lifespan
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