Elimination of Incretin Hormones in Patients With Severe Kidney Failure

Study Overview
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Brief Summary
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The prevalence of type 2 diabetes (T2D) is increasing rapidly worldwide. T2D is characterized by a severely impaired incretin effect. The incretin effect refers to the insulinotropic action of the nutrient-released incretin hormones glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic peptide (GIP). The incretin effect is defined as the difference in insulin secretory responses between oral and isoglycaemic intravenous glucose challenges (OGTT and IIGI, respectively) and in healthy individuals it accounts for as much as 70% of the insulin response following oral glucose, whereas patients with T2D exhibit an incretin effect in the range of 0 to 30%. Patients with T2D and non-diabetic patients with severe kidney failure share several pathophysiological characteristics, including decreased insulin sensitivity, fasting hyperinsulinaemia and impaired beta-cell function. The reason for these findings remains to be fully elucidated. An ongoing study in our research group is investigating the incretin effect and the incretin hormone secretory responses following OGTT, IIGI and meal ingestion, respectively. In continuation of this study, essential knowledge of metabolism of incretin hormones in an uremic milieu will be obtained in the present study prior to evaluation of the use of incretin-based agents in patients with impaired kidney function. In this second study we evaluate the elimination and biodegradation of GLP-1 and GIP. The biological active incretin hormones are rapidly degraded by the ubiquitous enzyme dipeptidyl peptidase-4 (DPP-4), generating inactive metabolites. The active hormones are however also eliminated by renal clearance, although the importance of this remains questionable. It is likely that the degradation and elimination of the active hormones will be significantly affected in patients with severe kidney impairment. We hypothesize that elimination and biodegradation of the two incretin hormones, both in it´s active and inactive forms, will be affected in non-diabetic patients with severe kidney failure.

Official Title
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Elimination and Biodegradation of the Incretin Hormones GLP-1 and GIP in Patients With End-stage Renal Disease

Conditions
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Uremia

Participation Criteria
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Eligibility Criteria
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1) Inclusion Criteria: Male or female; aged 18-90 years CKD stage 5 in chronic maintenance dialysis treatment BMI: 18,5-28 kg/m2 Normal fasting plasma glucose (<6,1 mM) Normal or impaired glucose tolerance (PG120 min <11,1 mM following OGTT) Inclusion Criteria: Male or female; aged 18-90 years Healthy including normal kidney function BMI: 18,5-28 kg/m2 Normal fasting plasma glucose (<6,1 mM) Normal or impaired glucose tolerance (PG120 min <11,1 mM following OGTT) 1+2) Exclusion Criteria: Diabetes mellitus Chronic pancreatitis / previous acute pancreatitis Treatment with oral glucocorticoids, calcineurin inhibitors, thiazides, dipeptidyl peptidase 4 (DPP4) inhibitors or other drugs, which could interfere with glucose or lipid metabolism Inflammatory bowel disease Malignant disease Bowel resection Severe anemia (hemoglobin <6.5 mmol/L)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Dialysis, Non-diabetic<br>Hemodialysis | |
| Healthy control<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intact GLP-1 concentration | During GLP-1 infusion 0-60 min | -60 min - 180 min | 
| Total GLP-1 concentration | GLP-1 infusion 0-60 min | -60 min - 180 min | 
| Intact GIP concentration | GIP infusion 0-60 min | - 60 min - 180 min | 
| Total GIP infusion | GIP infusion 0-60 min | -60 min - 180 min | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Incretin hormones, GLP-1, GIP, Uremia, Dialysis