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Localization of aortic disease is associated with intrinsic differences in aortic structure
B G Halloran1, V A Davis, B M McManus
1Department of Surgery, University of Nebraska Medical Center, Omaha, NE 68198-3280, USA.
The Journal of Surgical Research
|July 1, 1995
Summary
Structural protein content in the aorta changes distally. The infrarenal aorta has less elastin relative to collagen, potentially impacting its integrity and predisposing it to disease.
Area of Science:
- Vascular Biology
- Biochemistry
- Histology
Background:
- Atherosclerosis and aneurysms often affect the infrarenal aorta.
- Hemodynamic factors are implicated, but aortic anatomy may also play a role.
Purpose of the Study:
- To investigate changes in elastin and collagen content and organization throughout the normal human aorta.
- To identify potential anatomical predispositions to infrarenal aortic diseases.
Main Methods:
- Biochemical analysis (HPLC) of elastin and collagen content in aortic rings.
- Histological examination of intimal, medial, and adventitial thickness and elastin lamellae.
- Comparison of protein content normalized to lumenal surface area across aortic segments.
Main Results:
- Both collagen and elastin decrease from the proximal to distal aorta.
- A significant 58% decrease in elastin was observed between the suprarenal and infrarenal aorta.
- The infrarenal aorta showed a lower elastin to collagen ratio compared to other segments.
Conclusions:
- The infrarenal aorta exhibits unique biochemical and histological characteristics.
- Reduced elastin in the infrarenal aorta may compromise its compliance and integrity.
- These structural differences may contribute to the susceptibility of the infrarenal aorta to atherosclerosis and aneurysm formation.