Familial Renal GlucosuriaNCT03965000
Human Solute Carrier Family 5 Member 2 (SLC5A2) Deficiency and the Glucagon-Incretin Axis
An observational study of Familial Renal Glucosuria and Diabetes Mellitus, run by Medical University Innsbruck at 1 site in Austria.
Trial summary
Sodium-glucose-cotransporter 2 (SGLT2) are a new type of oral antidiabetic drugs. SGLT2 inhibitors increase the urinary glucose excretion and thereby decrease blood glucose levels. Beside their glucose lowering effects SGLT2 inhibitors showed beneficial effects on the cardiovascular health. Read more about this study
- Who is it for?
- Ages 18 to 80 yearsHealthy volunteers can take part
- Conditions the study is for
- Familial Renal Glucosuria, Diabetes Mellitus, Cardiovascular Diseases
- What is being tested?
- Mixed-meal-tolerance-test
- How many people
- 10 participants
- Where
- 1 siteAustria
- Study dates
- 24 Jan 2019to Jan 2022
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 80 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: One compound heterozygous female index patient and four heterozygous children. The control group consists of age, sex and BMI matched participants from nearly the same area to avoid environmental factors.
Who may be able to join
- At least 18 years
- Capable of giving consent
- One or more SLC5A2 mutations leading to FRG
- Written consent
Who cannot join
- Impaired glucose tolerance
- Diabetes mellitus
Trial locations and contacts
1 site in 1 country.
Austria1 site, 1 recruiting
- Recruiting
Medical University Innsbruck
Innsbruck, Tyrol, 6020
Christoph Ebenbichler, MD, Prof., +43 512 504 81394, mui-sponsor@i-med.ac.at
Christoph Ebenbichler, MD, Prof.
About this study
Official title: Human SLC5A2 Deficiency and the Glucagon-Incretin Axis: A Pilot Study
Sodium-glucose-cotransporter 2 (SGLT2) are a new type of oral antidiabetic drugs. SGLT2 inhibitors increase the urinary glucose excretion and thereby decrease blood glucose levels. Beside their glucose lowering effects SGLT2 inhibitors showed beneficial effects on the cardiovascular health. But several studies in cell culture and mice showed that the physiological inhibition of glucagon after meal consumption is impaired when using SGLT2 inhibitors.
The patients carry a rare genetical disease called Familial renal glucosuria (FRG), a human model of life long SGLT2 inhibition. To elucidate the effects of partial and complete SGLT2 inhibition in humans the investigators perform a mixed-meal tolerance test (MMTT), the gold standard for elucidation of insulin and glucagon dynamics.
Read the detailed description
The index patient was referred to the Department of Internal Medicine I at the Medical University of Innsbruck for evaluation of unclear glucosuria in combination with normal blood glucose levels. The patient suffered from recurrent urinary tract infections and increased urinary frequency, showed a physiological hemoglobin A1c and no further signs of renal dysfunction. Sequencing of the SLC5A2 coding region confirmed that the patient was compound heterozygous for two SLC5A2 mutations. The patient is a mother of five healthy children which are willing to take part in the test. The children show a 50/50 distribution of the mother's mutations. The MMTT will take place after 48 hours of alcohol, sport abstinence and an overnight fasting period. The patients will be given 6 ml/kg body weight of a standardized liquid meal. Blood samples will be collected 10 minutes before consumption of the meal, at the time point of consumption and 15, 30, 60, 120, 150, 180, 210 and 240 minutes after consumption. At each time point six blood tubes will be taken, except at time point -10 and 240 minutes, there is one sample more collected. The investigators aim to assess glucagon, insulin, c-peptide, gastric inhibitory polypeptide (GIP), Glucagon-like peptide-1 (GLP-1), Glucagon-like peptide-2 (GLP-2) levels.
Glucose tolerance will be assessed by using the 4 hours area under the curve (AUC) for glucose. To evaluate the beta-cell function the 4h-AUC's for insulin, c-peptide and the 4h-AUC insulin:glucose ratio will be calculated and compared. The calculation of the alpha-cell function will be performed with the AUC of glucagon and the AUC glucagon/glucose ratio. GIP, GLP-1 and GLP-2 will be determined using the AUC. The AUC's will be calculated by the trapezoidal method.
- Being tested
- Mixed-meal-tolerance-test
- Keywords
- SGLT2, SLC5A2, glucose metabolism, glucagon, incretin
- Medical subject headings
- Glycosuria, Renal, Diabetes Mellitus, Cardiovascular Diseases
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Mixed-meal-tolerance-testOther
To assess the dynamics of the glucagon-incretin axis we need to perform the MMTT. Thereby the patients need to consume a body weight adjusted, standardized meal and we draw blood at fixed time points over 4 hours.
| Study group | Role | What they receive |
|---|---|---|
| Patients | Patients carrying one or both mutations. Receives: Other: Mixed-meal-tolerance-test | |
| Controls | Patients not carrying a mutation Familial renal glucosuria causing mutation in the SLC5A2 gene and without impaired glucose tolerance and type 1 or 2 diabetes mellitus. Receives: Other: Mixed-meal-tolerance-test |
What is being measured
The primary outcome is the main question the study is designed to answer.
Changes in the glucagon-incretin axis.
Glucose tolerance will be assessed by using the 4 hours area under the curve (AUC) for glucose.
Beta-cell function will be assessed by the 4h-AUC's for insulin, c-peptide and the 4h-AUC insulin:glucose ratio will be calculated and compared. The calculation of the alpha-cell function will be performed with the AUC of glucagon and the AUC glucagon/glucose ratio. GIP, GLP-1 and GLP-2 will be determined using the AUC. The AUC's will be calculated by the trapezoidal method
Measured: 18 months
Changes in the gene expression
By collecting blood samples for gene expression analysis before and after the test and comparing it to our healthy controls.
Measured: 18 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 May 2019
- Study start24 Jan 2019
- Primary completionJan 2021 (estimated)
- Study completionJan 2022 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (6)Papers the sponsor has linked to this study.
- Other trials for Familial Renal GlucosuriaStudies of the same condition, open and under way.
- More trials run by Medical University InnsbruckThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Family based
- Time perspective
- Prospective
- Enrolment
- 10 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Medical University Innsbruck
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03965000
- Sponsor's protocol ID
- 20190121-1930
- Status last verified
- May 2019
- First submitted
- 23 May 2019
- Last updated
- 29 May 2019
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Zinman B, Wanner C, Lachin JM, Fitchett D, Bluhmki E, Hantel S, Mattheus M, Devins T, Johansen OE, Woerle HJ, Broedl UC, Inzucchi SE; EMPA-REG OUTCOME Investigators. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2015 Nov 26;373(22):2117-28. doi: 10.1056/NEJMoa1504720. Epub 2015 Sep 17.
PubMed 26378978Rosenstein R, Hough A. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2016 Mar 17;374(11):1093-4. doi: 10.1056/NEJMc1600827. No abstract available.
PubMed 26981944Zinman B, Lachin JM, Inzucchi SE. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2016 Mar 17;374(11):1094. doi: 10.1056/NEJMc1600827. No abstract available.
PubMed 26981940Ferrannini E, Muscelli E, Frascerra S, Baldi S, Mari A, Heise T, Broedl UC, Woerle HJ. Metabolic response to sodium-glucose cotransporter 2 inhibition in type 2 diabetic patients. J Clin Invest. 2014 Feb;124(2):499-508. doi: 10.1172/JCI72227. Epub 2014 Jan 27.
PubMed 24463454Bonner C, Kerr-Conte J, Gmyr V, Queniat G, Moerman E, Thevenet J, Beaucamps C, Delalleau N, Popescu I, Malaisse WJ, Sener A, Deprez B, Abderrahmani A, Staels B, Pattou F. Inhibition of the glucose transporter SGLT2 with dapagliflozin in pancreatic alpha cells triggers glucagon secretion. Nat Med. 2015 May;21(5):512-7. doi: 10.1038/nm.3828. Epub 2015 Apr 20.
PubMed 25894829Pedersen MG, Ahlstedt I, El Hachmane MF, Gopel SO. Dapagliflozin stimulates glucagon secretion at high glucose: experiments and mathematical simulations of human A-cells. Sci Rep. 2016 Aug 18;6:31214. doi: 10.1038/srep31214.
PubMed 27535321
Study at a glance
From the registry record, last updated by the sponsor on 29 May 2019. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Human SLC5A2 Deficiency and the Glucagon-Incretin Axis: A Pilot Study
- ClinicalTrials.gov ID
- NCT03965000
- Acronym / sponsor ID
- 20190121-1930
- Keywords
- SGLT2, SLC5A2, glucose metabolism, glucagon, incretin
- Study type
- Observational
- Recruitment status
- Unknown status
- Enrolment
- 10 participants (estimated)
- Lead sponsor
- Medical University InnsbruckUniversity, hospital or other
- Study start
- 24 Jan 2019 (actual)
- Primary completion
- Jan 2021 (estimated)
- Study completion
- Jan 2022 (estimated)
- First posted
- 28 May 2019 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Sodium-glucose-cotransporter 2 (SGLT2) are a new type of oral antidiabetic drugs. SGLT2 inhibitors increase the urinary glucose excretion and thereby decrease blood glucose levels. Beside their glucose lowering effects SGLT2 inhibitors showed beneficial effects on the cardiovascular health. But several studies in cell culture and mice showed that the physiological inhibition of glucagon after meal consumption is impaired when using SGLT2 inhibitors.
The patients carry a rare genetical disease called Familial renal glucosuria (FRG), a human model of life long SGLT2 inhibition. To elucidate the effects of partial and complete SGLT2 inhibition in humans the investigators perform a mixed-meal tolerance test (MMTT), the gold standard for elucidation of insulin and glucagon dynamics.
Detailed description
The index patient was referred to the Department of Internal Medicine I at the Medical University of Innsbruck for evaluation of unclear glucosuria in combination with normal blood glucose levels. The patient suffered from recurrent urinary tract infections and increased urinary frequency, showed a physiological hemoglobin A1c and no further signs of renal dysfunction. Sequencing of the SLC5A2 coding region confirmed that the patient was compound heterozygous for two SLC5A2 mutations. The patient is a mother of five healthy children which are willing to take part in the test. The children show a 50/50 distribution of the mother's mutations. The MMTT will take place after 48 hours of alcohol, sport abstinence and an overnight fasting period. The patients will be given 6 ml/kg body weight of a standardized liquid meal. Blood samples will be collected 10 minutes before consumption of the meal, at the time point of consumption and 15, 30, 60, 120, 150, 180, 210 and 240 minutes after consumption. At each time point six blood tubes will be taken, except at time point -10 and 240 minutes, there is one sample more collected. The investigators aim to assess glucagon, insulin, c-peptide, gastric inhibitory polypeptide (GIP), Glucagon-like peptide-1 (GLP-1), Glucagon-like peptide-2 (GLP-2) levels.
Glucose tolerance will be assessed by using the 4 hours area under the curve (AUC) for glucose. To evaluate the beta-cell function the 4h-AUC's for insulin, c-peptide and the 4h-AUC insulin:glucose ratio will be calculated and compared. The calculation of the alpha-cell function will be performed with the AUC of glucagon and the AUC glucagon/glucose ratio. GIP, GLP-1 and GLP-2 will be determined using the AUC. The AUC's will be calculated by the trapezoidal method.
Study design
- Observational model
- Family based
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Patients | – | Other: Mixed-meal-tolerance-testPatients carrying one or both mutations. |
| Controls | – | Other: Mixed-meal-tolerance-testPatients not carrying a mutation Familial renal glucosuria causing mutation in the SLC5A2 gene and without impaired glucose tolerance and type 1 or 2 diabetes mellitus. |
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- One compound heterozygous female index patient and four heterozygous children. The control group consists of age, sex and BMI matched participants from nearly the same area to avoid environmental factors.
Key inclusion criteria (4 listed)
- At least 18 years
- Capable of giving consent
- One or more SLC5A2 mutations leading to FRG
- Written consent
Key exclusion criteria (2 listed)
- Impaired glucose tolerance
- Diabetes mellitus
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Mixed-meal-tolerance-testTo assess the dynamics of the glucagon-incretin axis we need to perform the MMTT. Thereby the patients need to consume a body weight adjusted, standardized meal and we draw blood at fixed time points over 4 hours. | Other | Controls, Patients |
Primary outcome
Changes in the glucagon-incretin axis.
Time frame: 18 months
Glucose tolerance will be assessed by using the 4 hours area under the curve (AUC) for glucose. Beta-cell function will be assessed by the 4h-AUC's for insulin, c-peptide and the 4h-AUC insulin:glucose ratio will be calculated and compared. The calculation of the alpha-cell function will be performed with the AUC of glucagon and the AUC glucagon/glucose ratio. GIP, GLP-1 and GLP-2 will be determined using the AUC. The AUC's will be calculated by the trapezoidal method
Changes in the gene expression
Time frame: 18 months
By collecting blood samples for gene expression analysis before and after the test and comparing it to our healthy controls.
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 May 2019.
- Background: PubMed 26378978Zinman B, Wanner C, Lachin JM, Fitchett D, Bluhmki E, Hantel S, Mattheus M, Devins T, Johansen OE, Woerle HJ, Broedl UC, Inzucchi SE; EMPA-REG OUTCOME Investigators. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2015 Nov 26;373(22):2117-28. doi: 10.1056/NEJMoa1504720. Epub 2015 Sep 17.
- Background: PubMed 26981944Rosenstein R, Hough A. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2016 Mar 17;374(11):1093-4. doi: 10.1056/NEJMc1600827. No abstract available.
- Background: PubMed 26981940Zinman B, Lachin JM, Inzucchi SE. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2016 Mar 17;374(11):1094. doi: 10.1056/NEJMc1600827. No abstract available.
- Background: PubMed 24463454Ferrannini E, Muscelli E, Frascerra S, Baldi S, Mari A, Heise T, Broedl UC, Woerle HJ. Metabolic response to sodium-glucose cotransporter 2 inhibition in type 2 diabetic patients. J Clin Invest. 2014 Feb;124(2):499-508. doi: 10.1172/JCI72227. Epub 2014 Jan 27.
- Background: PubMed 25894829Bonner C, Kerr-Conte J, Gmyr V, Queniat G, Moerman E, Thevenet J, Beaucamps C, Delalleau N, Popescu I, Malaisse WJ, Sener A, Deprez B, Abderrahmani A, Staels B, Pattou F. Inhibition of the glucose transporter SGLT2 with dapagliflozin in pancreatic alpha cells triggers glucagon secretion. Nat Med. 2015 May;21(5):512-7. doi: 10.1038/nm.3828. Epub 2015 Apr 20.
- Background: PubMed 27535321Pedersen MG, Ahlstedt I, El Hachmane MF, Gopel SO. Dapagliflozin stimulates glucagon secretion at high glucose: experiments and mathematical simulations of human A-cells. Sci Rep. 2016 Aug 18;6:31214. doi: 10.1038/srep31214.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Familial Renal Glucosuria and Diabetes Mellitus, run by Medical University Innsbruck at 1 site in Austria.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 29 May 2019. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Austria. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
Each site lists its own contact: choose the nearest one under Trial locations. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Changes in the glucagon-incretin axis. (time frame: 18 months). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03965000, which also lists 6 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 May 2019.