Related Experiment Video
Updated: Jul 8, 2026
09:00
The Rabbit Blood-shunt Model for the Study of Acute and Late Sequelae of Subarachnoid Hemorrhage: Technical Aspects
Published on: October 2, 2014
Endothelial NO synthase gene expression in experimental vasospasm in rabbits
Qiang Fu1, Xiang-Yang Fu, Xiao-Hua Fu
1Department of Cardiology, Zhujiang Hospital, First Military Medical University, Guangzhou 510282, China. fq-tong@263.net
Di 1 Jun Yi Da Xue Xue Bao = Academic Journal of the First Medical College of PLA
|October 12, 2002
Summary
Reduced endothelial NO synthase (eNOS) gene expression in rabbits with hypercholesterolemia contributes to experimental vasospasm. This finding highlights eNOS
Area of Science:
- Cardiovascular Biology
- Molecular Medicine
- Vascular Physiology
Background:
- Endothelial nitric oxide synthase (eNOS) plays a critical role in vascular homeostasis.
- Dysregulation of eNOS is implicated in various cardiovascular diseases.
- Experimental vasospasm serves as a model to study vascular dysfunction.
Purpose of the Study:
- To elucidate the association between eNOS gene expression and the development of experimental vasospasm.
- To investigate the impact of hypercholesterolemia on eNOS expression in the context of vascular injury.
Main Methods:
- A rabbit model of balloon endothelial denudation was employed.
- Animals were fed either a normal or hypercholesterol diet.
- Vasospasm was assessed via angiography after ergonovine administration.
- eNOS mRNA expression was quantified using Northern blotting and localized with in situ hybridization.
Main Results:
- Hypercholesterolemic rabbits exhibited significant vasospasm at denuded sites.
- In situ hybridization revealed lower eNOS mRNA levels in the endothelium of hypercholesterolemic rabbits.
- Northern blotting confirmed a marked decrease in eNOS mRNA expression in the hypercholesterolemic group.
Conclusions:
- A reduction in eNOS mRNA expression, induced by endothelial denudation and hypercholesterolemia, is a key factor in experimental vasospasm.
- These findings suggest that impaired eNOS function contributes to the pathogenesis of vasospastic disorders.
- Modulating eNOS expression may offer therapeutic potential for vasospasm.
Related Concept Videos
01:24Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
01:16Vascular Spasm
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...