Aspirin Administration Mitigates Platelet Hyperaggregability After Splenectomy in a Murine Model

Area of Science:

• Hematology
• Surgical Research
• Thrombosis Research

Background:

• Splenectomy (SPLN) is associated with a 10%-35% risk of venous thromboembolic events.
• The mechanisms driving post-splenectomy thrombosis and effective prevention strategies remain unclear.
• Investigating platelet function after splenectomy is crucial for understanding thrombosis risk.

Purpose of the Study:

• To investigate platelet aggregation dynamics following splenectomy (SPLN) in a murine model.
• To evaluate the efficacy of aspirin (ASA) in mitigating post-SPLN platelet hyperaggregability.
• To determine the impact of concomitant hemorrhage on platelet function and aspirin response post-SPLN.

Main Methods:

• Murine models of splenectomy (SPLN) and submandibular hemorrhage (SMB) were employed.
• Mice were assigned to eight groups, including controls, SPLN, SMB, and combinations with aspirin (ASA) administration.
• Platelet counts, rotational thromboelastometry, and aggregometry (using ADP and AA agonists) were analyzed on POD 3.

Main Results:

• Splenectomy led to significant thrombocytosis and increased platelet aggregation mediated by both ADP and AA.
• Aspirin significantly reduced platelet aggregation in splenectomized mice, with or without hemorrhage.
• Hemorrhage did not significantly alter the observed platelet hyperaggregability or aspirin's inhibitory effect.

Conclusions:

• Platelet hyperaggregability post-splenectomy is driven by both ADP and AA signaling pathways.
• Early aspirin administration effectively mitigates increased platelet aggregation after splenectomy.
• Aspirin may serve as a preventative strategy against thrombosis exacerbated by polytrauma.