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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
Published on: October 27, 2009
[Mean platelet volume: interactions with platelet aggregation activity and glycoprotein IIb-IIIa and Ib expression
Abstract:
Increased mean platelet volume (MPV) is an independent risk factor of thrombotic events in patients with cardiovascular diseases. Interactions of MPV with platelet aggregation activity and contents of glycoprotein (GP) IIb-IIIa (alphaIIb/beta3 integrin, fibrinogen receptor) and GP Ib (von Willebrand factor receptor) were investigated in this study. Investigation was performed in a group of healthy volunteers (n = 38) and in a group of patients with acute coronary syndrome (ACS). In patients blood was collected at days 1, 3-5 and 8-12 after ACS development. As an antiaggregant therapy all patients received acetylsalicylic acid (ASA, inhibitor of thromboxane A2 synthesis) and most of them--clopidogrel (ADP receptor antagonist) with the exception of part of the patients (n = 44) at day 1 who had not taken clopidogrel before first blood collection. In volunteers platelet aggregation was stimulated by 1.25, 2.5, 5 and 20 M ADP, and in patients--by 5 and 20 M ADP. GP IIb-IIIa and GP Ib content on platelet surface was measured using 125I-labelled monoclonal antibodies. GP IIb-IIIa and GP Ib genetic polymorphisms were determined in ACS patients. In healthy donors significant correlations between MPV and aggregation levels were revealed at 1.25 and 2.5 M ADP (coefficients of correlation (r)--0.396 and 0.373, p < 0.05) and at 5 and 20 those interactions did not reach significant level (r--0.279 and 0.205, p > 0.05). Correlations between MPV and aggregation levels were observed at day 1 of ACS in a subgroup of patients who received ASA but had not started clopidogrel treatment (r--0.526, p < 0.01 and 0.368, p < 0.05 for 5 and 20 M ADP respectively). Interactions between these parameters were not registered upon combined treatment with ASA and clopidogrel. Strong direct correlations between MPV and GP IIb-IIIa and GP Ib contents were detected in healthy donors and ACS patients (at all time points) -r from 0.439 to 0.647 (p < or = 0.001 for all correlations). Genetic polymorphisms of GP IIb-IIIa (GP IIIa Leu33Pro) and GP Ib ((-5)T/C (Kozak) and Thr145Met) identified in ACS patients did not affect expression levels of corresponding glycoproteins. The data obtained indicated that increased MPV values correlate with increased platelet aggregation activity and enhanced GP IIb-IIIa and GP Ib expression.
Insights
Increased mean platelet volume (MPV) is linked to higher platelet aggregation and glycoprotein expression in cardiovascular patients. This finding highlights MPV
Area of Science:
- Cardiovascular Medicine
- Hematology
- Platelet Physiology
Background:
- Increased mean platelet volume (MPV) is a recognized risk factor for thrombotic events in cardiovascular diseases.
- Platelet function, including aggregation and glycoprotein expression, is crucial in thrombotic processes.
Purpose of the Study:
- To investigate the interactions between MPV, platelet aggregation, and the expression of glycoprotein (GP) IIb-IIIa and GP Ib.
- To assess these interactions in healthy volunteers and patients with acute coronary syndrome (ACS).
Main Methods:
- Blood samples were collected from healthy volunteers and ACS patients at various time points post-event.
- Platelet aggregation was measured using ADP stimulation.
- Expression levels of GP IIb-IIIa and GP Ib were quantified using labeled monoclonal antibodies.
- Genetic polymorphisms of GP IIb-IIIa and GP Ib were analyzed in ACS patients.
Main Results:
- Significant correlations were found between MPV and platelet aggregation in healthy donors at lower ADP concentrations.
- In ACS patients not on clopidogrel, MPV correlated with aggregation, particularly on day 1 post-ACS.
- Strong positive correlations were observed between MPV and the surface expression of GP IIb-IIIa and GP Ib in both healthy and ACS groups.
- Genetic polymorphisms did not significantly influence the expression levels of GP IIb-IIIa and GP Ib.
Conclusions:
- Increased MPV is associated with enhanced platelet aggregation activity.
- Elevated MPV correlates with increased expression of GP IIb-IIIa and GP Ib on platelets.
- These findings suggest MPV as a potential marker reflecting platelet activation and thrombotic potential in cardiovascular disease.
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