Related Experiment Videos
Patterns of drug-induced cardiovascular pathology in the beagle dog: relevance for humans
1Safety of Medicines Group, ZENECA Pharmaceuticals, Macclesfield, Cheshire, UK.
Abstract:
In toxicity studies, the examination of tissue sections for pathological changes is the principle method for the identification of organ toxicity and characterisation of the hazard of novel drugs for humans. Study of the patterns of pathological alterations also represents an important means of developing an understanding of the mechanism of toxicity. However as pathological change frequently represents a final common expression of diverse processes, additional functional information is often required for a clear understanding of the mechanisms of toxicity. This is exemplified in the evaluation of the effects of drugs on the beagle dog cardiovascular system where an understanding of mechanisms is crucial in the assessment of human risk. Particular patterns of drug-induced structural change in the myocardium or blood vessels are frequently linked to specific mechanisms of toxicity. However, assessment based on the interpretation of patterns of cardiovascular pathology alone may be misleading. Quite different changes in cardiac and vascular function or direct cellular toxicity may also be manifest by pathological features in common. Therefore, a clear understanding of mechanism frequently requires additional in vivo or in vitro physiological, pharmacological, biochemical or other mechanistic information. The beagle dog remains an important model for the study of cardiovascular toxicity because in this species, haemodynamic changes and pathological alterations can be related in a way that provides the basis for the safe study in humans of novel drugs with cardiovascular activity.
Insights
Pathological changes in toxicity studies are key but may be misleading. Integrating functional data with pathology in beagle dogs is crucial for understanding drug mechanisms and human risk.
Area of Science:
- Toxicology
- Cardiovascular Pharmacology
- Drug Safety Evaluation
Background:
- Pathological examination of tissue sections is standard for identifying organ toxicity and drug hazards.
- Understanding the mechanisms of toxicity is crucial for accurate hazard characterization and human risk assessment.
- Cardiovascular pathology patterns can be misleading without additional functional data.
Purpose of the Study:
- To highlight the importance of integrating functional and pathological data in cardiovascular toxicity studies.
- To emphasize the role of the beagle dog model in assessing novel cardiovascular drugs.
- To underscore the necessity of mechanistic information for interpreting drug-induced pathological changes.
Main Methods:
- Review of pathological alterations in drug toxicity studies.
- Integration of in vivo/in vitro physiological, pharmacological, and biochemical data.
- Utilizing the beagle dog model for correlating hemodynamic changes with pathological findings.
Main Results:
- Pathological changes alone may not fully elucidate toxicity mechanisms.
- Specific cardiovascular pathologies can arise from diverse underlying processes.
- The beagle dog model allows for relating functional and structural changes.
Conclusions:
- A comprehensive understanding of drug-induced cardiovascular toxicity requires combining pathological findings with mechanistic data.
- The beagle dog is a valuable model for cardiovascular safety assessment due to its capacity to link hemodynamic and pathological alterations.
- Accurate human risk assessment for novel cardiovascular drugs relies on integrated mechanistic and pathological evaluations.