- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02201602
Sulphonylurea Receptor Mutation and Responsiveness to Gliclazide - a Pilot Proof of Concept, Randomised Cross-over Study
August 31, 2016 updated by: Su Chi Lim, Khoo Teck Puat Hospital
Gliclazide has greater glucose lowering efficacy than glibenclamide among type 2 diabetes mellitus patients with minor haplotype (K23/A1369) at the KCNJ11/ABCC gene locations.
Study Overview
Detailed Description
Sulphonylurea (SU) is a glucose-lowering agent used widely to treat type 2 diabetes mellitus (T2DM).
SU promotes insulin secretion from the pancreatic islet beta cell via binding and inhibition of the ATP-sensitive potassium (KATP) channel.
The KATP channel is made up of two subcomponents, an inner Kir6.2 K+ channel (coded by the KCNJ11 gene) and an outer SU receptor 1 (SUR1) (coded by the ABCC8 gene).
Although all SUs are mechanistically similar in terms of increasing insulin secretion, they bind to distinct regions of Kir 6.2 and SUR1 to exert their function.
Different types of SU (e.g.
tolbutamide, glibenclamide, glipizide, glimepiride and gliclazide) can therefore be grouped by their binding sites (A/B/A+B site) on the KATP channel [3].
Interestingly, the KCNJ11 E23K (rs5219) variant was shown to confer susceptibility to T2DM and the ABCC8 S1369A (rs757110) variant was found to be in complete linkage disequilibrium with it i.e. inherited together as a genetic block (haplotype).
A recent in vitro molecular study suggested that the minor haplotype (K23/A1369) of KATP channel is sensitive to inhibition by gliclazide (binds to A-site) but not glibenclamide (binds to A+B site), and that the increased responsiveness to gliclazide was largely due to the A1369 allele.
Understanding how the response to these two SUs may vary with the presence of the minor haplotype (K23/A1369) would therefore be beneficial for customization of patient treatment to achieve better clinical outcomes.
Study Type
Interventional
Enrollment (Actual)
8
Phase
- Phase 4
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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Singapore, Singapore, 768828
- Khoo Teck Puat Hospital
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
21 years to 65 years (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Type 2 diabetes
- Age 21-65
- HbA1c >8.0% on two consecutive visits
Exclusion Criteria:
- Currently taking insulin at a regime more complex than basal insulin
- Not willing to perform self-blood glucose monitoring (SBGM)
- Renal impairment i.e. eGFR<50mls/min
- Pregnancy or unwilling to practice adequate contraception
- Taking other medications that may affect blood glucose e.g. systemic glucocorticoids.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Gliclazide
Gliclazide, 80 mg tablet, half to maximal dose, 3 weeks
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Other Names:
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Active Comparator: Glibenclamide
Glibenclamide, 5 mg tablet, half to maximal dose, 3 weeks
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Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Mean blood glucose level
Time Frame: 6 days
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6 days
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Glycemic variability
Time Frame: 6 days
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Glycemic variability will be assessed using the EasyGV software (http://www.phc.ox.ac.uk/research/diabetes/software/easygv/) which is capable of calculating 10 different measures of glycemic variability from continuous glucose monitoring data, such as Standard Deviation (SD) and M-value, mean amplitude of glycemic excursions (MAGE).
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6 days
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Su Chi Lim, MBBS, PhD, Khoo Teck Puat Hospital
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
General Publications
- Gloyn AL, Weedon MN, Owen KR, Turner MJ, Knight BA, Hitman G, Walker M, Levy JC, Sampson M, Halford S, McCarthy MI, Hattersley AT, Frayling TM. Large-scale association studies of variants in genes encoding the pancreatic beta-cell KATP channel subunits Kir6.2 (KCNJ11) and SUR1 (ABCC8) confirm that the KCNJ11 E23K variant is associated with type 2 diabetes. Diabetes. 2003 Feb;52(2):568-72. doi: 10.2337/diabetes.52.2.568.
- Hamming KS, Soliman D, Matemisz LC, Niazi O, Lang Y, Gloyn AL, Light PE. Coexpression of the type 2 diabetes susceptibility gene variants KCNJ11 E23K and ABCC8 S1369A alter the ATP and sulfonylurea sensitivities of the ATP-sensitive K(+) channel. Diabetes. 2009 Oct;58(10):2419-24. doi: 10.2337/db09-0143. Epub 2009 Jul 8.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
August 1, 2014
Primary Completion (Actual)
June 1, 2016
Study Completion (Actual)
July 1, 2016
Study Registration Dates
First Submitted
July 22, 2014
First Submitted That Met QC Criteria
July 25, 2014
First Posted (Estimate)
July 28, 2014
Study Record Updates
Last Update Posted (Estimate)
September 1, 2016
Last Update Submitted That Met QC Criteria
August 31, 2016
Last Verified
August 1, 2016
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- Gliclazide
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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