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Decreased platelet miR-223 expression is associated with high on-clopidogrel platelet reactivity

Rui Shi1, Lan Ge, Xin Zhou

  • 1Institute of Cardiovascular Disease and Heart Center, Pingjin Hospital, Logistics University of the Chinese People's Armed Police Forces, China.

Thrombosis Research
|March 19, 2013
PubMed

Insights

Decreased platelet miR-223 expression is linked to reduced responsiveness to clopidogrel in coronary heart disease patients. This finding offers a new understanding of clopidogrel resistance mechanisms.

Area of Science:

  • Cardiovascular Medicine
  • Molecular Biology
  • Pharmacogenomics

Background:

  • Clopidogrel is a P2Y12 inhibitor widely used to prevent atherothrombotic events in patients with coronary heart disease (CHD).
  • Individual variability in clopidogrel response can lead to suboptimal clinical outcomes.
  • Platelet microRNAs (miRNAs) are emerging as potential regulators of drug response.

Purpose of the Study:

  • To investigate the association between platelet miR-223 and miR-96 expression and clopidogrel responsiveness in Chinese patients with CHD.
  • To identify potential miRNA-based biomarkers for predicting clopidogrel response.

Main Methods:

  • Platelet reactivity was assessed using the platelet reactivity index (PRI) and ADP-induced platelet aggregation (PAG).
  • Platelet miR-223 and miR-96 expression levels were quantified using real-time PCR.
  • Statistical analyses, including correlation and logistic regression, were performed to determine the relationship between miRNA expression and clopidogrel responsiveness.

Main Results:

  • Decreased platelet miR-223 expression was significantly associated with low clopidogrel responsiveness as determined by PRI (P = 0.037).
  • miR-223 expression levels were inversely correlated with PRI (Spearman r = -0.403, P = 0.020).
  • Reduced miR-223 expression was identified as an independent predictor of low clopidogrel response (OR 0.189, P = 0.028), independent of other clinical and genetic factors.

Conclusions:

  • Decreased platelet miR-223 expression represents a novel mechanism contributing to blunted platelet response to clopidogrel.
  • Platelet miR-223 may serve as a potential biomarker for predicting clopidogrel responsiveness in CHD patients.
Abstract

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