- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00513760
Transporter Mediated Uptake of Montelukast (TPORT)
Characterization of Transporter Mediated Uptake of Montelukast in Humans
Leukotriene receptor antagonists (LTRAs) are frequently prescribed to reduce the symptoms associated with asthma. Singulair, manufactured by Merck, is a popular LTRA, however its effectiveness varies greatly between individuals. We are interested in understanding why the effectiveness of Singulair varies so greatly.
For an oral drug such as Singulair to be effective, the body must efficiently absorb it. We have found that blood levels of Singulair vary greatly between individuals, and we think that this variability is responsible for variability in response.
Drug absorption occurs primarily in the intestine. Due to differences in the chemical properties of drugs, some drugs can be absorbed easily while other drugs require help from special proteins produced by the cells that line the intestine. These proteins, or transporters act like turnstiles to allow drugs to move from the intestine to the bloodstream and are known to be inhibited by components of citrus juice. The activity of a transporter can be influenced by individual genetic variability.
We think that Singulair requires help from a transport protein to be absorbed and that genetic variability in this transporter leads to variability in the blood level of Singulair. In this proposal we will use citrus juice (grapefruit and orange) to inhibit intestinal membrane transport proteins and show that Singulair requires these transporters to be efficiently absorbed. Eventually, what we learn from this work will allow doctors to quickly test individuals with asthma to determine how well they will absorb Singulair and possibly other LTRAs. Knowing this will allow the doctor to adjust the drug treatment on an individual basis to maximize benefit in the treatment of asthma.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Montelukast (Merck brand name Singulair) is a selective Cys-LT1 receptor antagonist that is used to control asthma symptoms in children and adults. Although safe and effective, the inter-patient variability in response is substantial (25-60% response rate), which is due in part to genetic variability. For example, we recently reported that polymorphisms in candidate genes that encode proteins in the LT pathway influence responsiveness to the drug.
The long-range goal of our studies is to determine the contribution of genetic variability to the inter-patient variability in montelukast blood levels and responsiveness. In preliminary studies, we found that the plasma concentration vs. time data in single and multiple dose-studies vary more than 10-fold, which could contribute to inter-patient variability in response.
Montelukast is about 64% bioavailable, is cleared by CYP2C9 and CYP3A4 in the liver, and is nearly completely excreted into the bile. The physical properties of montelukast suggest that the drug undergoes transport by solute carrier transporters (SLC family transporters) and/or ATP-binding cassette transporters (ABC family transporters). Recent studies support the idea that genetic variation in genes encoding SLC and ABC transporters can influence the pharmacokinetics of drugs that are substrates for these transporters.
In the present submission, we propose to determine if montelukast is a substrate for SLC and/or ABC transporters. To accomplish this we will coadminister Singulair with citrus juice which contains known inhibitors of membrane transport proteins. If transporters are involved in the absorption of montelukast, then citrus juice should decrease the absorption of montelukast relative to Gatorade. Our working hypothesis for this study is that montelukast is a substrate for SLC (OATP1B3, OATP1B1, OATP2B1, OATP1A2) and ABC (MRP1, MRP2, and MRP3, BCRP) transporters. If true, then the pharmacokinetics of montelukast will be determined by the genetics of the membrane transporters. This highly significant observation will have important implications for understanding the disposition of montelukast in patients, and ultimately will lead to individualization of montelukast therapy in asthma.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Florida
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Jacksonville, Florida, United States, 32207
- Nemours Children's Clinic
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Doctor diagnosed asthma.
- Must not be taking any medications except for inhaled steroids.
Exclusion Criteria:
- Clinical conditions other than asthma.
- Upper respiratory tract infection within the past 30 days.
- Gastrointestinal conditions.
- Unable to stop taking or are required to begin taking any type of oral medication for the duration of the trial
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: 1
Coingestion of 240 ml of grapefruit juice with 10 mg of montelukast.
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Coingestion of 240 ml of grapefruit juice with 10 mg of montelukast.
Other Names:
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Active Comparator: 2
Coingestion of 240 ml of orange juice with 10 mg of montelukast.
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Coingestion of 240 ml of orange juice with 10 mg of montelukast.
Other Names:
|
Placebo Comparator: 3
Coingestion of 240 ml of Gatorade with 10 mg of montelukast.
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Coingestion of 240 ml of Gatorade with 10 mg of montelukast.
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Area under the concentration vs. time curve for the serum concentration of montelukast when coingested with grapefruit juice, orange juice, or Gatorade.
Time Frame: Within 12 hours after administration of a single 10 mg dose.
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Within 12 hours after administration of a single 10 mg dose.
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Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Improvement in respiratory function as assessed by spirometry, and impulse oscillometry vs. serum concentration of montelukast.
Time Frame: Within 12 hours after administration of a single 10 mg dose.
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Within 12 hours after administration of a single 10 mg dose.
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Edward B Mougey, Ph.D., Nemours Children's Clinic
Publications and helpful links
General Publications
- Lima JJ. Treatment heterogeneity in asthma: genetics of response to leukotriene modifiers. Mol Diagn Ther. 2007;11(2):97-104. doi: 10.1007/BF03256228.
- Lima JJ, Zhang S, Grant A, Shao L, Tantisira KG, Allayee H, Wang J, Sylvester J, Holbrook J, Wise R, Weiss ST, Barnes K. Influence of leukotriene pathway polymorphisms on response to montelukast in asthma. Am J Respir Crit Care Med. 2006 Feb 15;173(4):379-85. doi: 10.1164/rccm.200509-1412OC. Epub 2005 Nov 17.
Helpful Links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Other Study ID Numbers
- 32711
- 32-03215-003 (Other Grant/Funding Number: Nemours internal activity number)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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