Procoagulant activity during viral infections.

Area of Science:

• Immunology
• Hematology
• Virology

Background:

• Inflammation during viral infections disrupts the balance between pro-coagulant and anti-coagulant states.
• Endothelial dysfunction in systemic viral infections critically impacts hemostasis and can lead to organ failure.
• Elevated plasma markers like TAT, D-dimer TF-positive MPs, and vWF indicate a prothrombotic state during viral infections.

Purpose of the Study:

• To review the pathological mechanisms linking viral infections to a prothrombotic state.
• To discuss the role of tissue factor (TF)-dependent coagulation activation in viral infections.
• To explore Toll-like receptors (TLRs) signaling pathways activated by viral infections and their contribution to coagulation.

Main Methods:

• Literature review focusing on TF-dependent coagulation and TLR signaling in viral infections.
• Analysis of studies investigating procoagulant markers (TAT, D-dimer TF-positive MPs, vWF) in viral infections.
• Discussion of cell type- and species-specific TLR activation and its impact on research models.

Main Results:

• Viral infections induce inflammation that skews hemostasis towards a prothrombotic state.
• Endothelial activation and dysfunction are key contributors to organ failure during systemic viral infections.
• TLR activation by viruses is complex and varies by cell type and species, complicating direct translation of animal model findings to humans.

Conclusions:

• The procoagulant response during viral infections is multifactorial, involving inflammation, endothelial dysfunction, and specific signaling pathways.
• Further research is needed to fully elucidate the pathological mechanisms underlying viral infection-associated thrombosis.
• Understanding these mechanisms is vital for developing targeted therapies to mitigate thrombotic complications in viral diseases.