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Pupillary Changes as a Potential Biomarker for Escitalopram in Relation to CYP2C19 Polymorphism
| Tracking Information | ||||
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| First Received Date ICMJE | November 6, 2006 | |||
| Last Updated Date | February 5, 2008 | |||
| Start Date ICMJE | December 2006 | |||
| Primary Completion Date | October 2007 (Final data collection date for primary outcome measure) | |||
| Current Primary Outcome Measures ICMJE |
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| Original Primary Outcome Measures ICMJE | Same as current | |||
| Change History | Complete list of historical versions of study NCT00397059 on ClinicalTrials.gov Archive Site | |||
| Current Secondary Outcome Measures ICMJE |
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| Original Secondary Outcome Measures ICMJE | Same as current | |||
| Current Other Outcome Measures ICMJE | Not Provided | |||
| Original Other Outcome Measures ICMJE | Not Provided | |||
| Descriptive Information | ||||
| Brief Title ICMJE | Pupillary Changes as a Potential Biomarker for Escitalopram in Relation to CYP2C19 Polymorphism | |||
| Official Title ICMJE | Pupillary Changes as a Potential Biomarker for Escitalopram in Relation to CYP2C19 Polymorphism | |||
| Brief Summary | To study the impact of CYP2C19 polymorphism on escitalopram pharmacokinetics and pharmacodynamics measured as changes in pupil diameter | |||
| Detailed Description | Escitalopram, the therapeutic active S-enantiomer of citalopram, is a selective serotonine reuptake inhibitor (SSRI) used for treatment of depression and anxiety disorders. The antidepressant effect is probably due to a stimulation of the serotonergic neurotransmission caused by the inhibition of the presynaptic serotonin reuptake. This inhibition may also be responsible for the increased pupil diameter seen in volunteers treated with racemic citalopram. Based on escitaloprams pharmacodynamic properties it is expected to have the same affect on pupil diameter. A dose/response relationship has not yet been established but theoretically the pupillary changes might serve as a biomarker for the serotonergic effect of escitalopram. Escitalopram is demethylated in part by the polymorphic cytochrome P450 enzyme 2C19 (CYP2C19); but the impact of CYP2C19 polymorphism on the total metabolism of escitalopram is still to be investigated. Objective: The aim of this study is to investigate the pharmacokinetics and pharmacodynamics in CYP2C19 extensive metabolizers (EMs) and poor metabolizers (PMs) and to investigate whether change in pupil size reaction to a light stimulus can act as a biomarker for the serotonergic effect of escitalopram. The study will be conducted as a randomized, double blinded; placebo controlled two phases cross-over trial with single and repeated doses of 20 mg escitalopram and equivalent placebo. Sixteen healthy volunteers (8 EMs and 8 PMs) will participate in the trial. Prior to the trial, approximately 400 volunteers will be phenotyped by omeprazole metabolic ratio in order to identify the CYP2C19 EMs and PMs. During the two phases blood samples will be drawn and pupil sizes will be measured at fixed time points after drug administration. |
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| Study Type ICMJE | Interventional | |||
| Study Phase | Phase 4 | |||
| Study Design ICMJE | Allocation: Randomized Intervention Model: Crossover Assignment Masking: Double Primary Purpose: Treatment |
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| Condition ICMJE | Healthy | |||
| Intervention ICMJE | Drug: Escitalopram | |||
| Study Arms | Not Provided | |||
| Publications * | Not Provided | |||
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* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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| Recruitment Information | ||||
| Recruitment Status ICMJE | Completed | |||
| Estimated Enrollment ICMJE | 16 | |||
| Completion Date | October 2007 | |||
| Primary Completion Date | October 2007 (Final data collection date for primary outcome measure) | |||
| Eligibility Criteria ICMJE | Inclusion Criteria:
Exclusion Criteria:
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| Sex/Gender |
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| Ages | 18 Years to 45 Years (Adult) | |||
| Accepts Healthy Volunteers | Yes | |||
| Contacts ICMJE | Contact information is only displayed when the study is recruiting subjects | |||
| Listed Location Countries ICMJE | Denmark | |||
| Removed Location Countries | ||||
| Administrative Information | ||||
| NCT Number ICMJE | NCT00397059 | |||
| Other Study ID Numbers ICMJE | AKF-371 EudraCT no: 2006-001976-19 |
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| Has Data Monitoring Committee | Not Provided | |||
| U.S. FDA-regulated Product | Not Provided | |||
| IPD Sharing Statement | Not Provided | |||
| Responsible Party | Not Provided | |||
| Study Sponsor ICMJE | University of Southern Denmark | |||
| Collaborators ICMJE | H. Lundbeck A/S | |||
| Investigators ICMJE |
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| PRS Account | University of Southern Denmark | |||
| Verification Date | February 2008 | |||
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ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |
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