Neutrophil extracellular traps in ischemic stroke thrombi

Area of Science:

• Neuroscience
• Immunology
• Cardiovascular Research

Background:

• Neutrophil extracellular traps (NETs) are implicated in thrombus formation.
• The composition of ischemic stroke thrombi, particularly the role of NETs, remains poorly understood.
• Understanding NETs in cerebral occlusions is crucial for optimizing tissue plasminogen activator (t-PA) therapy.

Purpose of the Study:

• To investigate the presence and quantification of neutrophils and NETs in ischemic stroke thrombi.
• To explore the potential of targeting NETs for improved thrombolytic therapy.

Main Methods:

• Immunostaining of 68 ischemic stroke thrombi using neutrophil and NET markers (CD66b, neutrophil elastase, H3Cit, extracellular DNA).
• Quantification of neutrophils and NETs within thrombi.
• Ex vivo thrombus lysis using DNase 1 and t-PA.

Main Results:

• Neutrophils and NETs (indicated by H3Cit and extracellular DNA) were extensively present in all analyzed thrombi.
• H3Cit was more abundant in cardioembolic thrombi and older thrombi.
• Addition of DNase 1 to t-PA enhanced ex vivo thrombus lysis.

Conclusions:

• Neutrophils and NETs are significant constituents of cerebral thrombi.
• Targeting NETs with DNase 1 shows promise as a prothrombolytic strategy for acute ischemic stroke.
• This finding could lead to improved therapeutic approaches for stroke patients.