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Localization of Hemostasis Elements in Aspirated Coronary Thrombi at Different Stages of Evolution

Dóra Pituk1,2, László Balogh3, Emőke Horváth4

  • 1Division of Clinical Laboratory Science, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary.

International Journal of Molecular Sciences
|November 9, 2024
PubMed

Insights

Investigating ST-segment elevation myocardial infarction (STEMI) thrombi reveals activated protein C (APC/PC) aids neutrophil extracellular trap (NET) degradation. This finding suggests new therapeutic targets for STEMI patients.

Area of Science:

  • Cardiovascular Biology
  • Hematology
  • Immunology

Background:

  • Coronary thrombus structure in STEMI is not fully understood.
  • Activated protein C (APC/PC) and neutrophil extracellular traps (NETs) play roles in thrombosis.
  • Fibrin-related factors like FXIII and α2-PI are crucial in thrombus formation.

Purpose of the Study:

  • To characterize coronary thrombi in STEMI patients based on age.
  • To investigate the presence and role of APC/PC in relation to NETs.
  • To analyze the association of FXIII and α2-PI with fibrin in thrombus evolution.

Main Methods:

  • Histopathological analysis of 24 male STEMI patient thrombi.
  • Immunofluorescent staining and confocal microscopy for detailed analysis.
  • Classification of thrombi into fresh, lytic, and organized stages.

Main Results:

  • FXIII consistently co-localized with fibrin across all thrombus ages.
  • α2-PI levels increased significantly in the lytic phase, associating with fibrin.
  • APC/PC was present from the fresh stage, and its co-localization with NETs suggests a role in NET degradation.

Conclusions:

  • APC/PC appears to play a role in degrading NETs within evolving STEMI thrombi.
  • The study highlights the dynamic interplay of APC/PC, NETs, and fibrin-related factors in STEMI.
  • Findings suggest potential for novel therapeutic strategies targeting these pathways in STEMI.

Keywords:
NETs (neutrophil extracellular traps)confocal microscopycoronary thrombosisfactor XIIIfibrinogenhistopathologymyocardial Infarctionprotein Cthrombus aspirationα2-plasmin inhibitor

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