Impaired frequencies and function of platelets and tissue remodeling in chronic Chagas disease

Area of Science:

• Immunology
• Cardiovascular Medicine
• Hematology

Background:

• Chronic inflammation from Trypanosoma cruzi infection drives immune system activation in Chagas disease.
• Previous work linked elevated soluble P-selectin to Chagas cardiomyopathy severity.

Purpose of the Study:

• To investigate biomarkers of platelet and endothelial activation, tissue remodeling, and coagulation in chronic Chagas heart disease stages.
• To understand hemostatic changes associated with Trypanosoma cruzi infection.

Main Methods:

• Assessed frequencies of activated platelets (CD41a, CD62P) and adenosine diphosphate-induced platelet activation.
• Measured serum levels of fibrinogen, endothelin-1, and procollagen I in patients across different clinical stages.
• Compared findings between infected subjects and uninfected controls.

Main Results:

• Activated platelet frequencies (CD41a, CD62P) were decreased in T. cruzi-infected patients, inversely correlating with disease severity.
• Platelet activation by adenosine diphosphate was reduced in infected individuals.
• Increased serum fibrinogen was observed in many infected subjects.
• Severe cardiac dysfunction correlated with elevated endothelin-1, while procollagen I levels were normal.

Conclusions:

• Chronic Trypanosoma cruzi infection induces significant hemostatic alterations.
• These alterations occur even in patients without overt cardiac symptoms, suggesting early impact on coagulation and platelet function.