Related Experiment Video
Updated: Jun 30, 2026
08:53
The Arteriovenous (AV) Loop in a Small Animal Model to Study Angiogenesis and Vascularized Tissue Engineering
Published on: November 2, 2016
Functional arteries grown in vitro
L E Niklason1, J Gao, W M Abbott
1Department of Anesthesia, Duke University, Durham, NC 27710, USA. nikla001@mc.duke.edu
Science (New York, N.Y.)
|April 16, 1999
Summary
Researchers engineered vascular grafts using smooth muscle and endothelial cells. These tissue-engineered vascular grafts demonstrated high strength and contractile function, showing potential for future clinical applications.
Area of Science:
- Biomedical Engineering
- Regenerative Medicine
- Vascular Biology
Background:
- Vascular graft development is crucial for treating cardiovascular diseases.
- Current grafts face limitations such as thrombosis and infection.
- Tissue engineering offers a promising alternative for creating functional vascular substitutes.
Purpose of the Study:
- To develop a tissue engineering strategy for producing vascular graft material.
- To characterize the mechanical and biological properties of engineered vascular grafts.
- To evaluate the in vivo performance of tissue-engineered arteries.
Main Methods:
- Vascular cells (smooth muscle and endothelial) were isolated from bovine vascular tissue biopsies.
- Cells were cultured and seeded onto a scaffold to create vascular grafts.
- Grafts were cultured under pulsatile conditions to mimic physiological flow.
- Mechanical properties (rupture strength, suture retention) and cellular differentiation markers were assessed.
- In vivo implantation in miniature swine was performed, with patency monitored via digital angiography.
Main Results:
- Engineered bovine vessels exhibited high rupture strength (>2000 mmHg) and suture retention strength (up to 90 g).
- Cultured vessels demonstrated contractile responses to pharmacological agents.
- Smooth muscle cells within the grafts displayed differentiation markers (calponin, myosin heavy chains).
- Implanted tissue-engineered arteries remained patent for up to 24 days in miniature swine.
Conclusions:
- A viable tissue engineering approach for creating functional vascular grafts was established.
- The engineered vascular grafts possess promising mechanical and biological characteristics.
- In vivo patency suggests potential for clinical translation in vascular reconstruction.
Related Concept Videos
01:16Arteries and Arterioles
Arteries, the vasculature responsible for transporting blood from the heart, possess robust walls capable of enduring the elevated pressures exerted by the heartbeat. Arteries near the heart are especially thick-walled and enriched with elastic fibers across their three tunics, classifying them as elastic or conducting arteries. These arteries, usually with a diameter exceeding 10 mm, are characterized by their ability to dilate in response to the blood pumped from the heart's ventricles and...
01:07Development of Blood Vessels
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...