Related Experiment Video
Updated: Aug 1, 2026
The Rabbit Model of Accelerated Atherosclerosis: A Methodological Perspective of the Iliac Artery Balloon Injury
Published on: October 3, 2017
Age-related variations in transport properties of the rabbit arterial wall near branches
1Department of Biochemistry and Physiology, University of Reading, UK.
Insights
This study reveals age-related changes in how plasma proteins enter the aorta near branches. These transport variations may explain patterns of lipid accumulation in arteries.
Area of Science:
- Cardiovascular Biology
- Vascular Physiology
- Atherosclerosis Research
Background:
- Lipid accumulation in the human aorta shows age-dependent localization patterns near arterial branches.
- Plasma lipoproteins are a suspected source of lipids in these aortic deposits.
- Previous studies on protein uptake in arteries have yielded conflicting results.
Purpose of the Study:
- To investigate age-related changes in plasma protein uptake by the rabbit aortic wall near arterial branches.
- To correlate these transport properties with observed patterns of lipid accumulation.
Main Methods:
- Albumin, a plasma protein, was fluorescently labeled and administered intravenously to rabbits of varying ages on a normal diet.
- Aortic tissue near branches was collected 3 hours post-injection.
- Digital imaging fluorescence microscopy quantified tracer distribution within the intima-media.
Main Results:
- Young rabbits showed higher albumin uptake downstream of intercostal ostia compared to upstream.
- This downstream preference diminished and reversed with increasing age.
- Overall aortic protein uptake was highest in animals shortly after weaning and decreased in older animals.
Conclusions:
- Age-related variations in aortic protein transport influence lipid deposition patterns.
- These findings help reconcile discrepancies in previous uptake studies and explain human arterial lipid accumulation.
- The study provides insights into the dynamic nature of vascular permeability and its role in early atherosclerosis.
Abstract:
Lipid accumulation in the human aorta occurs predominantly downstream of branches in foetuses, neonates and infants but upstream at later ages. The lipid in these deposits may derive from plasma lipoproteins. We have examined uptake of plasma proteins by the rabbit aortic wall near branches as a function of age. Albumin was labelled with a fluorescent dye and introduced into the circulation of animals fed a normal diet. The aorta was fixed in situ 3 h later and the distribution of tracer in sections through the wall was measured by using digital imaging fluorescence microscopy. Net uptake by the intima-media was higher downstream of intercostal ostia than upstream in young animals but this difference decreased and then reversed with age. Furthermore, the average of uptake by both regions was higher shortly after weaning than at later ages. These age-related variations in transport properties may explain discrepancies between previous studies of uptake, resolve apparent inconsistencies between the properties of rabbit and human arteries and, if applicable to man, might account for the non-uniform and changing pattern of lipid accumulation around arterial branches.
