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Pharmacogenetics of Warfarin Induction and Inhibition

15. října 2018 aktualizováno: University of Minnesota

This research study will help determine how a person's genetic makeup affects their response to drugs, the ability of the body to break down drugs, and their potential to experience an interaction between drugs. The investigators are investigating the drug interactions with the commonly used anticoagulant drug called warfarin. Warfarin is used for the treatment and prevention of life-threatening abnormal blood clots such as deep vein thrombosis, heart attacks, and strokes. The investigators chose warfarin for this study because it is a commonly used drug and must be monitored closely to avoid side effects. The investigators are interested in studying whether individuals with certain genetic profiles react differently to warfarin when it is combined with other drugs. This research is being done to see if certain genetic profiles require us to adjust warfarin doses differently than is needed for the general population. Genetic profiles of subjects are determined from their participation in the Pharmacogenetics Registry study (investigator Richard Brundage, University of Minnesota).

The study hypothesis is: Functionally defective CYP2C9 alleles attenuate the warfarin-fluconazole inhibitory interaction and exacerbate the warfarin-rifampin inductive interaction.

Přehled studie

Detailní popis

The research question is: How does CYP2C9 genotype modify warfarin drug interactions?

People differ in their genetic makeup. This includes differences in genes involved in drug metabolism, transport, and effect in the body. People with certain genetic profiles produce altered enzymes, transporters, and receptors that may respond in different ways to drugs. Altered enzymes cause some drugs to be broken down at a different rate than normal. As a result, drug concentrations build up in the blood, and increase the risk of side effects. Furthermore, when two drugs are taken together, the possibility exists for the drugs to interact, with one drug causing a change in the metabolism of the other or both of the drugs. It is not known whether people with an altered genetic makeup also have an altered experience with drug interactions. Altered drug transporters can affect the absorption and elimination of drugs as compared to normal causing differences in how long the drug stays in the body. Finally, altered drug receptors can respond differently to drugs and, thus, produce altered desired or undesired effects.

In this study, the investigators will be investigating the drug interactions with the commonly used anticoagulant drug warfarin in subjects with five different CYP2C9 genotypes. The CYP2C9 genotype is particularly important because this drug metabolizing enzyme governs the metabolic clearance of the more potent chemical entity (the S-enantiomer) of the drug. Warfarin is used for the treatment and prevention of life-threatening abnormal blood clots such as deep vein thrombosis, myocardial infarction, and strokes. The investigators chose warfarin for this study because it is a commonly used drug and must be monitored closely to avoid side effects. The investigators are interested in studying whether individuals with certain genetic alleles of the CYP2C9 genotype react differently to warfarin when it is combined with an antifungal (fluconazole) that inhibits CYP2C9-mediated metabolism and an antibiotic (rifampin) that induces CYP2C9-mediated metabolism. This research is being done to see if certain genetic profiles require us to adjust warfarin doses differently than is needed for the general population.

The study hypothesis is: Functionally defective CYP2C9 alleles attenuate the warfarin-fluconazole inhibitory interaction and exacerbate the warfarin-rifampin inductive interaction.

Typ studie

Intervenční

Zápis (Aktuální)

39

Fáze

  • Nelze použít

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní místa

    • Minnesota
      • Minneapolis, Minnesota, Spojené státy, 55414
        • Clinical and Translational Science Institute

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let až 60 let (Dospělý)

Přijímá zdravé dobrovolníky

Ano

Pohlaví způsobilá ke studiu

Všechno

Popis

Inclusion Criteria:

  • Subjects will be 18-60 years old.
  • Women of child bearing age must be willing to use measures to avoid conception during the study period.
  • Subjects must agree not to take any known substrates, inhibitors, inducers or activators of either CYP2C9 or CYP3A4 from 1 week prior to the start of each study through the last day of study.

Exclusion Criteria:

  • Current cigarette smoker
  • Abnormal renal, liver function tests, physical exam, or recent history of hepatic, renal, gastrointestinal or neoplastic disease.
  • Allergy to warfarin, fluconazole or rifampin and other chemically related drugs.
  • Recent ingestion (< 1 week) of any medication known to be metabolized by or alter CYP2C9 or CYP3A4 activity.
  • A positive pregnancy test at the time of the pharmacokinetic study.
  • Lab tests indicative of abnormal blood clotting capacity.

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Primární účel: Základní věda
  • Přidělení: Nerandomizované
  • Intervenční model: Paralelní přiřazení
  • Maskování: Žádné (otevřený štítek)

Zbraně a zásahy

Skupina účastníků / Arm
Intervence / Léčba
Jiný: CYP2C9*1/*1 Genotype
This genotype is considered the wild type genotype. Individuals with the CYP2C9*1/*1 genotype have two *1 alleles and participated in the following interventions: Control - Warfarin only, Fluconazole - Warfarin, and Rifampin - Warfarin.
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Ostatní jména:
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 400 mg fluconazole taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Diflucan
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 300 mg rifampin taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Coumadin
  • Rifadin
Jiný: CYP2C9*1B/*1B Haplotype
Individuals with the CYP2C9*1B/*1B haplotype have two CYP2C9*1B alleles and participated in the following interventions: Control - Warfarin only and Rifampin - Warfarin.
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Ostatní jména:
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 300 mg rifampin taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Coumadin
  • Rifadin
Jiný: CYP2C9*1/*3 Genotype
Individuals with the CYP2C9*1/*3 genotype have one *1 allele and one *3 allele and participated in the following interventions: Control - Warfarin only, Fluconazole - Warfarin, and Rifampin - Warfarin.
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Ostatní jména:
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 400 mg fluconazole taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Diflucan
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 300 mg rifampin taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Coumadin
  • Rifadin
Jiný: CYP2C9*2/*3 Genotype
Individuals with the CYP2C9*2/*3 genotype have one *2 and one *3 allele and participated in the following interventions: Control - Warfarin only, Fluconazole - Warfarin, and Rifampin - Warfarin.
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Ostatní jména:
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 400 mg fluconazole taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Diflucan
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 300 mg rifampin taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Coumadin
  • Rifadin
Jiný: CYP2C9*3/*3 Genotype
Individuals with the CYP2C9*3/*3 genotype have two *3 alleles and participated in the following interventions: Control - Warfarin only, Fluconazole - Warfarin, and Rifampin - Warfarin.
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Ostatní jména:
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 400 mg fluconazole taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Diflucan
  • Coumadin
A single 10 mg warfarin dose taken at the start of the study period. 300 mg rifampin taken every morning starting a week before the start of the study period and continuing throughout the study period.
Ostatní jména:
  • Coumadin
  • Rifadin

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Warfarin Clearance.
Časové okno: Over three (two for CYP2C9*1B/*1B participants) 12-16 day study periods.
Warfarin enantiomer (S-warfarin and R-warfarin) clearance was measured in healthy volunteers genotyped for CYP2C9*1/*1, CYP2C9*1B/*1B, CYP2C9*1/*3, CYP2C9*2/*3 and CYP2C9*3/*3 to determine the magnitude of the warfarin-fluconazole (inhibition) and warfarin-rifampin (induction) drug interactions.
Over three (two for CYP2C9*1B/*1B participants) 12-16 day study periods.

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Vyšetřovatelé

  • Vrchní vyšetřovatel: Richard Brundage, PhD, University of Minnesota

Publikace a užitečné odkazy

Osoba odpovědná za zadávání informací o studiu tyto publikace poskytuje dobrovolně. Mohou se týkat čehokoli, co souvisí se studiem.

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia

1. května 2009

Primární dokončení (Aktuální)

1. června 2013

Dokončení studie (Aktuální)

1. června 2013

Termíny zápisu do studia

První předloženo

29. ledna 2010

První předloženo, které splnilo kritéria kontroly kvality

4. října 2011

První zveřejněno (Odhad)

6. října 2011

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

14. listopadu 2018

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

15. října 2018

Naposledy ověřeno

1. října 2018

Více informací

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .

Klinické studie na Zdravý

Klinické studie na Control - Warfarin only

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