Time-dependent Pathologic and Inflammatory Consequences of Various Blood Sampling Techniques in Mice

Area of Science:

• Veterinary Medicine
• Animal Welfare Science
• Biomedical Research

Background:

• Accurate and ethical blood collection is crucial for mouse research.
• Different blood sampling methods carry varying risks of inflammation, stress, and tissue damage.

Purpose of the Study:

• To compare six common mouse blood sampling methods.
• To evaluate the impact of each method on local and systemic inflammation, body weight, and corticosterone levels.

Main Methods:

• Six methods were compared: lateral tail incision, tail-tip amputation, sublingual, submandibular, and saphenous vein puncture, and retrobulbar sinus puncture.
• Assessment included histopathology, gene expression analysis (S1008/9A, Cxcl2, Il1b, Nlrp3, Il6, Il33), plasma haptoglobin, corticosterone levels, and body weight changes.
• Evaluations were conducted 6 hours to 12 days post-sampling.

Main Results:

• Tail-based methods (lateral tail incision, tail-tip amputation, saphenous vein puncture) induced significant, slow-resolving local inflammation and tissue damage.
• Head-based methods (retrobulbar sinus puncture, sublingual, submandibular puncture) and anesthesia resulted in higher corticosterone levels.
• Retrobulbar sinus puncture caused the most significant body weight loss.
• Systemic inflammation was minimal across all methods, except for transient increases in haptoglobin after some procedures.

Conclusions:

• No single blood sampling method is universally superior for mice.
• Tail-based methods cause more prolonged local tissue damage and inflammation.
• Head-based methods are associated with higher acute stress responses (corticosterone).
• Method selection should balance scientific objectives with animal welfare considerations.