Refinement of a mouse cardiovascular model: Development, application and dissemination.

Area of Science:

• Platelet biology and thromboembolism research.
• Animal model development for biomedical research.

Background:

• European and UK legislation mandates the 3Rs (reduction, refinement, replacement) in animal procedures.
• Platelet biology and thromboembolism studies traditionally rely on animal models, particularly mice.
• Existing in vitro and in vivo methods have limitations regarding animal numbers and ethical considerations.

Purpose of the Study:

• To review developments in the 3Rs for platelet biology and thromboembolism research.
• To highlight advancements in reducing animal use and improving welfare in these studies.
• To advocate for the adoption of newer, more ethical, and scientifically robust animal models.

Main Methods:

• Scaling down in vitro techniques like light transmission assays.
• Developing ex vivo approaches to minimize animal involvement.
• Refining in vivo models, such as real-time monitoring of radiolabeled platelets under anesthesia.
• Implementing micro-sampling and cell counting techniques for simpler monitoring.

Main Results:

• Scaled-down in vitro methods reduce the number of animals required.
• Refined in vivo models, like real-time monitoring, decrease severity and animal numbers while increasing sensitivity.
• Emerging 3Rs models provide improved scientific insights compared to traditional mortality endpoints.
• Simpler monitoring techniques are being developed to encourage the uptake of advanced methods.

Conclusions:

• Traditional thromboembolic mortality models are now considered obsolete.
• Advanced 3Rs models offer superior scientific outcomes and ethical advantages in platelet research.
• The adoption of refined and reduced animal models is crucial for ethical and efficient scientific progress.