Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure
December 2nd, 2014
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Heart failure is the leading cause of hospitalization and a major cause of mortality. A model of permanent ligation of the left anterior descending coronary artery in mice is applied to investigate ventricular remodelling and cardiac dysfunction post-myocardial infarction. The technique of invasive hemodynamic measurements in mice is presented.
Overview
This article presents a model of permanent ligation of the left anterior descending coronary artery in mice to study cardiac remodeling and heart failure following myocardial infarction. The technique includes invasive hemodynamic measurements to evaluate cardiac function.
Key Study Components
Area of Science
- Cardiology
- Cardiac physiology
- Animal models of heart disease
Background
- Heart failure is a leading cause of hospitalization and mortality.
- Myocardial infarction leads to significant cardiac dysfunction.
- Understanding ventricular remodeling is crucial for developing treatments.
- Invasive hemodynamic measurements provide insights into cardiac function.
Purpose of Study
- To demonstrate the technique of permanent ligation of the left anterior descending coronary artery in mice.
- To investigate cardiac remodeling post-myocardial infarction.
- To evaluate cardiac function using in vivo invasive hemodynamic measurements.
Methods Used
- Permanent ligation of the left anterior descending coronary artery in mice.
- Invasive hemodynamic measurements to assess cardiac function.
- Demonstration of the surgical procedure and evaluation techniques.
- Use of sedated mice for accurate measurement and observation.
Main Results
- Successful demonstration of the ligation technique.
- Evaluation of cardiac function post-surgery.
- Insights into the process of cardiac remodeling.
- Establishment of a reliable model for future heart failure studies.
Conclusions
- The model provides a valuable tool for studying heart failure mechanisms.
- Invasive hemodynamic measurements are effective for assessing cardiac function.
- Further research can build on this model to explore therapeutic interventions.
Frequently Asked Questions
What is the significance of this study?
This study provides insights into cardiac remodeling and heart failure mechanisms, which are crucial for developing new treatments.
How does the ligation technique work?
The ligation technique involves permanently blocking the left anterior descending coronary artery to induce myocardial infarction in mice.
What are invasive hemodynamic measurements?
Invasive hemodynamic measurements assess the heart's performance by directly measuring pressures and flows within the heart and blood vessels.
Who conducted the experiments?
The experiments were conducted by Marlin Locks, a senior animal technician, and Eja, a PhD student.
What can be learned from this model?
This model helps researchers understand the progression of heart failure and test potential therapeutic strategies.
Executive Industry Relevance
The permanent ligation of the left anterior descending coronary artery in mice provides a robust preclinical model for studying post-myocardial infarction ventricular remodeling and heart failure. This model enables quantitative assessment of cardiac function and structural changes, supporting mechanistic de-risking and target validation in cardiovascular drug discovery. Its reproducibility and pathophysiological relevance make it a critical tool for portfolio triage and translational research in heart failure therapeutics.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of therapeutic hypotheses related to myocardial injury and remodeling.
- Supports biological de-risking by modeling fixed infarct size and subsequent cardiac remodeling.
- Facilitates functional target validation through direct measurement of cardiac performance post-infarction.
- Provides predictive confidence for advancing cardiovascular targets in the pipeline.
Screening & Assay Development
- Establishes a validated in vivo system for evaluating candidate interventions on cardiac remodeling.
- Delivers standardized, quantitative hemodynamic outputs for assay reproducibility.
- Supports screening readiness by enabling consistent infarct induction and measurement endpoints.
- Allows for reliable comparison of compound effects on ventricular function and structure.
Translational & Preclinical Research
- Aligns with disease-relevant mechanisms of heart failure progression post-myocardial infarction.
- Enables continuity from discovery through preclinical validation of cardiac remodeling interventions.
- Supports risk-adjusted advancement decisions based on quantitative functional and structural readouts.
- Provides a platform for evaluating translational biomarkers of cardiac injury and repair.
Pipeline & Workflow Integration
This model integrates into the discovery-to-preclinical continuum for cardiovascular drug development, bridging early mechanistic studies and translational validation.
- Discovery Biology: Facilitates hypothesis testing on infarct expansion, healing, and ventricular remodeling.
- Screening: Provides reproducible, quantitative hemodynamic and histological endpoints for compound evaluation.
- Analytics: Enables measurement of infarct size, ventricular pressures, and remodeling indices for comparative analysis.
- Translational Research: Connects preclinical findings to clinical heart failure mechanisms and biomarker development.
- Enterprise Reuse: Serves as a reusable platform for diverse cardiovascular research and therapeutic screening.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in heart failure research.
- Operational Value: Standardizes infarct induction and functional assessment for reproducibility and scalability.
- Strategic Value: Informs go/no-go decisions and enhances capital efficiency by de-risking early-stage cardiovascular programs.
- Portfolio Impact: Supports risk-adjusted prioritization and advancement of heart failure therapeutic candidates.
Implementation Considerations
- Requires expertise in microsurgical techniques and invasive hemodynamic measurements.
- Demands specialized instrumentation for pressure catheterization and data acquisition.
- Necessitates cross-team standardization of surgical and analytical protocols.
- Adaptation may be needed for different mouse strains or comorbid models.
- Limitations include fixed infarct size and potential variability in surgical outcomes.
Biopharma FAQs
Why does null hypothesis testing matter for infarct size quantification?
Null hypothesis testing in infarct size quantification enables objective evaluation of intervention effects, supporting target validation and reducing false positives in early discovery. This statistical rigor ensures that observed differences in infarct area or remodeling are attributable to the tested variable rather than random variation.
How does independent variable isolation fit invasive hemodynamic measurements?
Isolating the independent variable, such as a specific intervention, during invasive hemodynamic measurements allows for precise attribution of changes in cardiac function to that intervention. This approach strengthens mechanistic insights and informs decision-making in the discovery pipeline.
What do quantitative ventricular pressure measurements enable in this model?
Quantitative ventricular pressure measurements provide direct, reproducible readouts of cardiac function, enabling comparison across experimental groups and supporting robust assessment of therapeutic impact on heart failure progression.
Why are replication requirements critical for infarct expansion analysis?
Replication in infarct expansion analysis ensures that findings are consistent and reproducible across experiments, facilitating cross-functional collaboration and increasing confidence in translational relevance for portfolio advancement.
Which statistical analysis capabilities are required before implementing infarct quantification?
Implementing infarct quantification requires statistical capabilities for comparing infarct size, ventricular pressures, and remodeling indices, ensuring that observed effects are significant and actionable for R&D decision-making.
Chapters in this video
0:05
Title
1:09
Permanent Ligation of the Left Anterior Descending Coronary Artery
3:22
Chest Retractor Removal
4:20
In Vivo Invasive Hemodynamic Measurements in Mice
7:21
Results: Area at Risk and Infarct Size Assessment After Myocardial Infarction
9:01
Conclusion
