Monocyte procoagulant activity in Whipple's disease

Area of Science:

• Hematology
• Infectious Diseases
• Pathophysiology

Background:

• Whipple's disease is a rare infectious disease with complex pathophysiology.
• Circulating mononuclear cells play a role in immune responses and coagulation.
• Understanding procoagulant activity in monocytes is crucial for disease insight.

Observation:

• Two of four patients with active Whipple's disease exhibited spontaneous procoagulant activity.
• This activity originated from monocytes and directly cleaved prothrombin, distinct from Factor Xa.
• Monocytes from treated patients or healthy subjects did not display this prothrombinase activity.

Findings:

• Active Whipple's disease is associated with endogenous monocyte stimulation, leading to prothrombinase expression.
• Antibiotic therapy resolved this monocyte prothrombinase activity, correlating with symptom improvement.
• Endotoxin stimulation produced thromboplastin in both patients and controls, indicating a separate pathway.

Implications:

• Circulating monocytes in active Whipple's disease may contribute to the condition's pathophysiology through prothrombinase activity.
• This finding offers a potential therapeutic target for managing Whipple's disease.
• Further research can elucidate the mechanisms of monocyte activation in this disease.