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Protein C antigen is not an acute phase reactant and is often high in ischemic heart disease and diabetes
Insights
High protein C antigen (PC:Ag) levels were observed in patients with ischemic heart disease and diabetes, suggesting a specific link to thrombotic tendency. This finding was distinct from acute-phase reactions, warranting further investigation into the underlying mechanisms.
Area of Science:
- Biochemistry
- Hematology
- Clinical Medicine
Background:
- Protein C is a crucial antithrombotic protein.
- Thromboembolism is a significant clinical concern.
- Understanding protein C regulation is vital for thrombotic disease management.
Purpose of the Study:
- To investigate protein C antigen (PC:Ag) levels in patients with conditions predisposing to thromboembolism.
- To determine if elevated PC:Ag is specifically associated with thrombotic risk or a general inflammatory response.
Main Methods:
- Immunological measurement of protein C antigen (PC:Ag).
- Analysis of PC:Ag levels in 299 patients across various clinical conditions.
- Comparative analysis with acute-phase reactants (fibrinogen, orosomucoid, prothrombin) in specific patient groups.
Main Results:
- Elevated mean PC:Ag levels were found in patients with ischemic heart disease and, to a lesser extent, in diabetics.
- Normal mean PC:Ag levels were observed in patients with thrombotic strokes, deep-vein thrombosis, and tumors.
- High PC:Ag levels did not correlate with acute-phase reactants, ruling out a non-specific inflammatory response.
Conclusions:
- Elevated PC:Ag may be specifically linked to the thrombotic tendency in certain patient groups, such as those with ischemic heart disease and diabetes.
- The findings suggest a potential specific relationship between high PC:Ag and increased risk of thrombosis.
- Further research is needed to elucidate the precise mechanism behind this observed relationship.
Abstract:
Protein C, an antithrombotic protein, was measured immunologically in 299 patients with clinical conditions associated with a high frequency of venous or arterial thromboembolism. The mean protein C antigen (PC:Ag) level was high for 48 patients with ischemic heart disease and, to a lesser extent, for 95 diabetics. In 28 patients with thrombotic strokes, 48 patients with proximal deep-vein thrombosis and in 80 patients with localized or metastatic tumors, mean PC:Ag was normal. Comparison of the pattern of changes of PC:Ag levels with those of fibrinogen, orosomucoid and prothrombin in 21 patients during the postoperative period and in 20 patients with active rheumatoid arthritis ruled out the possibility that high PC:Ag is non-specific, acute-phase reaction to inflammation, tissue injury or neoplastic growth. Therefore, high PC:Ag might be specifically related to the thrombotic tendency of these patients, but the mechanism of such a relationship remains to be clarified.