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Plasma soluble P-selectin in acute myocardial infarction: effects of coronary recanalization therapy
Insights
Plasma P-selectin levels are elevated in acute myocardial infarction (AMI) patients. Direct angioplasty reduced P-selectin, while thrombolysis increased it, suggesting mechanical reperfusion may be more effective for AMI.
Area of Science:
- Cardiology
- Biochemistry
- Vascular Biology
Background:
- P-selectin mediates leukocyte adhesion, contributing to reperfusion injury and no-reflow phenomenon in acute myocardial infarction (AMI).
- Investigating plasma P-selectin levels is crucial for understanding therapeutic outcomes in AMI.
Purpose of the Study:
- To investigate plasma P-selectin levels in AMI patients undergoing coronary recanalization therapy.
- To compare the effects of direct percutaneous transluminal coronary angioplasty (PTCA) and thrombolytic therapy on P-selectin levels in AMI.
Main Methods:
- Studied 40 patients: 20 AMI with direct PTCA, 10 AMI with thrombolysis (TPA), and 10 stable angina with elective PTCA.
- Measured plasma-soluble P-selectin using enzyme immunoassay before and after interventions.
- Analyzed changes in P-selectin levels in response to different recanalization strategies.
Main Results:
- Plasma P-selectin was significantly higher in AMI patients (176.6 ng/mL) compared to stable angina (91.4 ng/mL).
- Direct PTCA decreased P-selectin in AMI patients (176.2 to 141.7 ng/mL).
- Thrombolysis with TPA increased P-selectin in 90% of AMI patients (177.4 to 248.8 ng/mL).
Conclusions:
- Direct PTCA attenuated increased P-selectin activity in AMI.
- Thrombolysis with TPA augmented P-selectin, potentially due to direct stimulatory effects.
- Mechanical recanalization may yield more favorable outcomes in salvaging ischemic myocardium than thrombolytic therapy in AMI.
Abstract:
P-selectin is translocated from platelets and endothelial cells to initiate the first step in a sequence of events leading to the adherence of leukocytes, possibly inducing reperfusion injury and the no-reflow phenomenon in acute myocardial infarction (AMI). This study was undertaken to investigate plasma P-selectin in AMI patients undergoing coronary recanalization therapy. A total of 40 patients were studied: 20 patients with AMI who underwent coronary recanalization by direct percutaneous transluminal coronary angioplasty (PTCA), 10 patients with AMI who underwent thrombolytic therapy by tissue-type plasminogen activator (TPA), and 10 patients with stable angina pectoris who underwent elective PTCA. Blood samples were obtained from systemic arteries before and immediately after PTCA or thrombolytic therapy. Plasma-soluble P-selectin was measured by enzyme immunoassay. Plasma P-selectin was significantly higher in AMI than in stable angina pectoris (176.6 +/- 12.9 ng/mL vs 91.4 +/- 9.5 ng/mL, p<0.001). Plasma P-selectin did not change significantly as a result of elective PTCA in patients with stable angina (from 91.4 +/- 9.5 ng/mL to 87.9 +/- 7.9 ng/mL). Plasma P-selectin was decreased by direct PTCA in all of the 20 patients with AMI (from 176.2 +/- 17.7 ng/mL to 141.7 +/- 12.6 ng/mL; p<0.001, paired t-test), whereas it was increased by thrombolysis using TPA in nine of the 10 AMI patients (from 177.4 +/- 17.2 ng/mL to 248.8 +/- 17.3 ng/mL, p<0.005). Increased P-selectin activity in AMI appeared to be attenuated by direct PTCA, but augmented by thrombolysis, possibly due to direct stimulatory effects of TPA on P-selectin expression. This may lead to less favorable results in salvaging the ischemic myocardium by thrombolytic than mechanical coronary recanalization therapy in AMI.