简介：
Overview
This protocol describes a minimally invasive technique for achieving efficient transgene expression in the hearts of rats and mice using direct intramyocardial injection of a virus under ultrasound guidance. The protocol also includes methods to assess ventricular arrhythmia susceptibility via programmed electrical stimulation in isolated, Langendorff-perfused hearts.
Key Study Components
Research Area
- Cardiac arrhythmias
- Ventricular function
- Gene expression studies in animal models
Background
- Importance of studying cardiac arrhythmias
- Existing conventional approaches involve greater invasiveness
- Potential for using small animal models to study heart disease
Methods Used
- Intramyocardial injection of viral vectors
- Mice and rats as model organisms
- Langendorff perfusion system and ECG monitoring
Main Results
- Injection technique demonstrated effective transgene expression
- Increased susceptibility to arrhythmias in myocardial infarction models
- Protocol validated by contrasting results in healthy vs. affected hearts
Conclusions
- This study provides an efficient methodology for gene expression analysis in cardiac tissues
- The results contribute to understanding arrhythmia mechanisms in heart disease research
What is the purpose of the protocol?
The protocol aims to facilitate gene expression studies and assess cardiac arrhythmia susceptibility in small animal models.
How is the virus injected into the heart?
The virus is injected directly into the left ventricular free wall under ultrasound guidance.
What preliminary step is required before the injection?
The left lower chest region of the animal must be sterilized prior to the procedure.
What technology is used to monitor the heart during the experiment?
An ECG system is used to record the electrical activity of the heart.
Why is the Langendorff perfusion technique used?
It allows for the maintenance of the heart in an isolated setting while ensuring proper perfusion and assessment of arrhythmias.
What types of arrhythmias can be induced using this protocol?
The protocol is designed to induce ventricular tachycardia and fibrillation.
What happens if arrhythmias are not induced?
The heart may be labeled as non-inducible, indicating resistance to arrhythmia under the given conditions.
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