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Pharmacogenetics of Warfarin Induction and Inhibition

15 ottobre 2018 aggiornato da: 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.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

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.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

39

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Stati Uniti
    • Minnesota
      • Minneapolis, Minnesota, Stati Uniti, 55414
        • Clinical and Translational Science Institute

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 18 anni a 60 anni (Adulto)

Accetta volontari sani

Sì

Sessi ammissibili allo studio

Tutto

Descrizione

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.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Scienza basilare
  • Assegnazione: Non randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Altro: 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.
Droga: Control - Warfarin only
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Altri nomi:
  • Coumadin
Droga: Fluconazole - Warfarin
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.
Altri nomi:
  • Diflucan
  • Coumadin
Droga: Rifampin - Warfarin
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.
Altri nomi:
  • Coumadin
  • Rifadin
Altro: 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.
Droga: Control - Warfarin only
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Altri nomi:
  • Coumadin
Droga: Rifampin - Warfarin
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.
Altri nomi:
  • Coumadin
  • Rifadin
Altro: 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.
Droga: Control - Warfarin only
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Altri nomi:
  • Coumadin
Droga: Fluconazole - Warfarin
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.
Altri nomi:
  • Diflucan
  • Coumadin
Droga: Rifampin - Warfarin
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.
Altri nomi:
  • Coumadin
  • Rifadin
Altro: 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.
Droga: Control - Warfarin only
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Altri nomi:
  • Coumadin
Droga: Fluconazole - Warfarin
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.
Altri nomi:
  • Diflucan
  • Coumadin
Droga: Rifampin - Warfarin
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.
Altri nomi:
  • Coumadin
  • Rifadin
Altro: 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.
Droga: Control - Warfarin only
A single 10 mg warfarin dose taken at the start of the study period. No other medications taken during this study period.
Altri nomi:
  • Coumadin
Droga: Fluconazole - Warfarin
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.
Altri nomi:
  • Diflucan
  • Coumadin
Droga: Rifampin - Warfarin
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.
Altri nomi:
  • Coumadin
  • Rifadin

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Warfarin Clearance.
Lasso di tempo: 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.

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

University of Minnesota

Collaboratori

National Institute of General Medical Sciences (NIGMS)

Investigatori

  • Investigatore principale: Richard Brundage, PhD, University of Minnesota

Pubblicazioni e link utili

La persona responsabile dell'inserimento delle informazioni sullo studio fornisce volontariamente queste pubblicazioni. Questi possono riguardare qualsiasi cosa relativa allo studio.

Pubblicazioni generali

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio

1 maggio 2009

Completamento primario (Effettivo)

1 giugno 2013

Completamento dello studio (Effettivo)

1 giugno 2013

Date di iscrizione allo studio

Primo inviato

29 gennaio 2010

Primo inviato che soddisfa i criteri di controllo qualità

4 ottobre 2011

Primo Inserito (Stima)

6 ottobre 2011

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

14 novembre 2018

Ultimo aggiornamento inviato che soddisfa i criteri QC

15 ottobre 2018

Ultimo verificato

1 ottobre 2018

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • 0807M38361
  • P01GM032165-26 (Sovvenzione/contratto NIH degli Stati Uniti)

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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