Influence of paraoxonase-1 Q192R and cytochrome P450 2C19 polymorphisms on clopidogrel response

Rolf Kreutz, Perry Nystrom, Yvonne Kreutz, Jia Miao, Zeruesenay Desta, Jeffrey Breall, Lang Li, ChienWei Chiang, Richard Kovacs, David A. Flockhart, Yan Jin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Background: The metabolic activation of clopidogrel is a two-step process. It has been suggested that paraoxonase-1 (PON1) is a rate-limiting enzyme in the conversion of 2-oxo- clopidogrel to an active thiol metabolite. Conflicting results have been reported in regard to (1) the association of a common polymorphism of PON1 (Q192R) with reduced rates of coronary stent thrombosis in patients taking clopidogrel and (2) its effects on platelet inhibition in patient populations of European descent. Methods: Blood samples from 151 subjects of mixed racial background with established coronary artery disease and who received clopidogrel were analyzed. Platelet aggregation was determined with light transmittance aggregometry and VerifyNow® P2Y12 assay. Genotyping for cytochrome P450 2C19 (CYP2C19)*2 and *3 and PON1 (Q192R) polymorphisms was performed. Results: Carriers of CYP2C19*2 alleles exhibited lower levels of platelet inhibition and higher on-treatment platelet aggregation than noncarriers. There was no significant difference in platelet aggregation among PON1 Q192R genotypes. Homozygous carriers of the wild-type variant of PON1 (QQ192) had similar on-treatment platelet reactivity to carriers of increasedfunction variant alleles during maintenance clopidogrel dosing, as well as after administration of a clopidogrel 600 mg loading dose. Conclusion: CYP2C19*2 allele is associated with impaired platelet inhibition by clopidogrel and high on-treatment platelet aggregation. PON1 (Q192R) polymorphism does not appear to be a significant determinant of clopidogrel response.

Original languageEnglish
Pages (from-to)13-20
Number of pages8
JournalClinical Pharmacology: Advances and Applications
Volume4
Issue number1
DOIs
StatePublished - 2012

Fingerprint

clopidogrel
Aryldialkylphosphatase
Cytochrome P-450 Enzyme System
Platelet Aggregation
Blood Platelets
Alleles
Coronary Thrombosis
Sulfhydryl Compounds
Stents
Coronary Artery Disease

Keywords

  • Aggregation
  • Cytochrome P450 enzymes
  • Platelet
  • PON1

ASJC Scopus subject areas

  • Pharmacology (medical)

Cite this

Influence of paraoxonase-1 Q192R and cytochrome P450 2C19 polymorphisms on clopidogrel response. / Kreutz, Rolf; Nystrom, Perry; Kreutz, Yvonne; Miao, Jia; Desta, Zeruesenay; Breall, Jeffrey; Li, Lang; Chiang, ChienWei; Kovacs, Richard; Flockhart, David A.; Jin, Yan.

In: Clinical Pharmacology: Advances and Applications, Vol. 4, No. 1, 2012, p. 13-20.

Research output: Contribution to journalArticle

Kreutz, Rolf ; Nystrom, Perry ; Kreutz, Yvonne ; Miao, Jia ; Desta, Zeruesenay ; Breall, Jeffrey ; Li, Lang ; Chiang, ChienWei ; Kovacs, Richard ; Flockhart, David A. ; Jin, Yan. / Influence of paraoxonase-1 Q192R and cytochrome P450 2C19 polymorphisms on clopidogrel response. In: Clinical Pharmacology: Advances and Applications. 2012 ; Vol. 4, No. 1. pp. 13-20.
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AU - Kreutz, Rolf

AU - Nystrom, Perry

AU - Kreutz, Yvonne

AU - Miao, Jia

AU - Desta, Zeruesenay

AU - Breall, Jeffrey

AU - Li, Lang

AU - Chiang, ChienWei

AU - Kovacs, Richard

AU - Flockhart, David A.

AU - Jin, Yan

PY - 2012

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N2 - Background: The metabolic activation of clopidogrel is a two-step process. It has been suggested that paraoxonase-1 (PON1) is a rate-limiting enzyme in the conversion of 2-oxo- clopidogrel to an active thiol metabolite. Conflicting results have been reported in regard to (1) the association of a common polymorphism of PON1 (Q192R) with reduced rates of coronary stent thrombosis in patients taking clopidogrel and (2) its effects on platelet inhibition in patient populations of European descent. Methods: Blood samples from 151 subjects of mixed racial background with established coronary artery disease and who received clopidogrel were analyzed. Platelet aggregation was determined with light transmittance aggregometry and VerifyNow® P2Y12 assay. Genotyping for cytochrome P450 2C19 (CYP2C19)*2 and *3 and PON1 (Q192R) polymorphisms was performed. Results: Carriers of CYP2C19*2 alleles exhibited lower levels of platelet inhibition and higher on-treatment platelet aggregation than noncarriers. There was no significant difference in platelet aggregation among PON1 Q192R genotypes. Homozygous carriers of the wild-type variant of PON1 (QQ192) had similar on-treatment platelet reactivity to carriers of increasedfunction variant alleles during maintenance clopidogrel dosing, as well as after administration of a clopidogrel 600 mg loading dose. Conclusion: CYP2C19*2 allele is associated with impaired platelet inhibition by clopidogrel and high on-treatment platelet aggregation. PON1 (Q192R) polymorphism does not appear to be a significant determinant of clopidogrel response.

AB - Background: The metabolic activation of clopidogrel is a two-step process. It has been suggested that paraoxonase-1 (PON1) is a rate-limiting enzyme in the conversion of 2-oxo- clopidogrel to an active thiol metabolite. Conflicting results have been reported in regard to (1) the association of a common polymorphism of PON1 (Q192R) with reduced rates of coronary stent thrombosis in patients taking clopidogrel and (2) its effects on platelet inhibition in patient populations of European descent. Methods: Blood samples from 151 subjects of mixed racial background with established coronary artery disease and who received clopidogrel were analyzed. Platelet aggregation was determined with light transmittance aggregometry and VerifyNow® P2Y12 assay. Genotyping for cytochrome P450 2C19 (CYP2C19)*2 and *3 and PON1 (Q192R) polymorphisms was performed. Results: Carriers of CYP2C19*2 alleles exhibited lower levels of platelet inhibition and higher on-treatment platelet aggregation than noncarriers. There was no significant difference in platelet aggregation among PON1 Q192R genotypes. Homozygous carriers of the wild-type variant of PON1 (QQ192) had similar on-treatment platelet reactivity to carriers of increasedfunction variant alleles during maintenance clopidogrel dosing, as well as after administration of a clopidogrel 600 mg loading dose. Conclusion: CYP2C19*2 allele is associated with impaired platelet inhibition by clopidogrel and high on-treatment platelet aggregation. PON1 (Q192R) polymorphism does not appear to be a significant determinant of clopidogrel response.

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