Fibrinolysis: from blood to the brain

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Classical fibrinolysis involves plasminogen activation for fibrin breakdown, utilized therapeutically for blood clots.
• The plasminogen activating system, particularly tissue-type plasminogen activator (t-PA), has critical, non-fibrinolytic roles in the central nervous system (CNS).
• t-PA influences various CNS cells (astrocytes, neurons, microglia, pericytes) and impacts neurological conditions.

Purpose of the Study:

• To review the multifaceted roles of the plasminogen activating system in CNS biology.
• To discuss the implications of t-PA in neurological disorders such as ischemic stroke, traumatic brain injury, and neurodegenerative diseases.
• To explore the potential unintended consequences of thrombolytic and anti-fibrinolytic therapies in the CNS.

Main Methods:

• Literature review of studies on plasminogen activators in the CNS.
• Analysis of research on t-PA's direct and plasmin-mediated effects on neural cells.
• Examination of animal models and emerging clinical data regarding CNS conditions.

Main Results:

• t-PA exhibits diverse functions in the CNS independent of fibrinolysis.
• Aberrant expression of plasminogen system components is implicated in various CNS pathologies.
• Evidence from animal models suggests significant clinical relevance, with human data emerging.

Conclusions:

• The plasminogen activating system is a key player in CNS function and disease.
• Further research is needed to fully elucidate the clinical significance of t-PA in neurological disorders.
• Thrombolytic and anti-fibrinolytic drugs may have off-target effects in the CNS requiring careful consideration.