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Published on: September 15, 2023
Coronary artery bypass graft surgery up-regulates genes involved in platelet aggregation
1Department of Medicine, Atherosclerosis Research Unit, Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.
Insights
Coronary artery bypass graft surgery increases platelet aggregation. Key proteins like glycoprotein (GP)IIb/IIIa show elevated mRNA and expression post-surgery, potentially increasing thrombus formation risk.
Area of Science:
- Cardiovascular Surgery
- Thrombosis Research
- Platelet Biology
Background:
- Coronary artery bypass graft (CABG) surgery can lead to increased thromboembolic events.
- The hypercoaguable state post-CABG is linked to platelet activation and regeneration.
- Platelets play a crucial role in thrombosis, especially after inflammatory stimuli like CABG.
Purpose of the Study:
- To investigate changes in platelet messenger RNA (mRNA) profiles after CABG.
- To test the hypothesis that platelets are in a prothrombotic state following CABG surgery.
- To identify specific genes and proteins involved in post-CABG platelet activity.
Main Methods:
- Blood samples collected from 11 patients before and after CABG (3-6 days).
- Platelets were purified for gene expression profiling using low-density arrays (LDA).
- Seven patients underwent gene expression profiling; four additional patients had flow cytometry for GPIIb/IIIa receptor analysis.
Main Results:
- Significant up-regulation of glycoprotein (GP)IIb, GPIIIa, and cyclooxygenase-1 (COX-1) mRNA was observed.
- Findings confirmed in additional patients, including flow cytometry analysis of the GPIIb/IIIa receptor.
- Elevated GPIIb/IIIa mRNA levels correlated with increased GPIIb/IIIa expression on platelets post-CABG.
Conclusions:
- CABG surgery increases mRNA and protein levels of key platelet aggregation factors.
- Marked elevation of GPIIb/IIIa mRNA leads to significantly increased GPIIb/IIIa expression post-CABG.
- Increased GPIIb/IIIa expression may contribute to heightened thrombus formation and myocardial infarction risk after CABG.
Background:
During and shortly after coronary artery bypass graft (CABG) surgery, there is an increase in thromboembolic events. CABG, a strong inflammatory stimulus, is associated with a hypercoaguable state. Platelets might contribute to this hypercoaguable state because they have a pivotal role in thrombosis. In the days following surgery there is augmented platelet regeneration in response to the inflammatory stimulus.
Objectives:
The aim of this study was to investigate any changes in platelet mRNA profiles to test the hypothesis that post-CABG surgery platelets are associated with a prothrombotic state.
Methods:
Blood was sampled and platelets purified from 11 patients before and 3-6 days after CABG. Gene expression profiling was performed using low density array (LDA) plates for seven of the patients.
Results:
Forty-five genes were examined and those significantly up-regulated were glycoprotein (GP)IIb, GPIIIa and cyclooxygenase-1 (COX-1). These findings were confirmed in four more patients, including flow cytometry analysis of the GPIIb/IIIa receptor.
Conclusions:
CABG surgery up-regulates mRNA and protein levels of proteins that are key players in platelet aggregation. Marked elevation of GPIIb/IIIa mRNA levels results in significantly increased GPIIb/IIIa expression in platelets post-CABG surgery, which may be a reason for increased thrombus formation and myocardial infarction after CABG.
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