Diabetes Mellitus
Conditions
Keywords
exendin-4, GLP-1 receptor imaging, SPECT, pancreas, surgery, quantification
Brief summary
The main goal is to study the correlation of pancreatic uptake of In-111-DTPA-exendin-4 (measured by ex vivo counting) with the beta cell mass determined in the pancreatic specimens obtained after surgery.
Detailed description
In order to fully characterize the highly promising tracer In-111-DTPA-exendin-4 in humans, quantitative SPECT imaging will be correlated to the ex vivo tracer distribution in patients undergoing pancreatectomy or a Whipple procedure. In vivo imaging will be combined with post-pancreatectomy (micro)autoradiography, measurement of In-111-DTPA-exendin-4 concentrations in the pancreas using a gamma counter and morphometric determination of the actual beta cell mass. By this means, the relation between tracer uptake and beta cell mass in non-diabetic patients and T2D patients will be established. These highly relevant data will allow the improvement of the interpretation of clinical quantitative SPECT data in subsequent studies in patients with T1D and T2D. In addition, high uptake has been observed in the duodenum/pyloric area in patients in an ongoing study. At this point in time, it remains unclear which cells are responsible for this uptake. It would be of great interest to identify the GLP-1R positive cells in order to better understand the physiological actions of GLP-1 agonists.
Interventions
RADIATIONindium-111-exendin SPECT/CT
SPECT/CT imaging after injection with In-111-DTPA-exendin-4
Sponsors
Radboud University Medical Center
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
OTHER
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Scheduled for partial or complete pancreatectomy or Whipple procedure at Radboudumc
Exclusion criteria
* Resection that provides insufficient amount of tissue * Previous treatment with synthetic Exendin (Exenatide, Byetta®) or Dipeptidyl- Peptidase IV inhibitors * Breast feeding * Pregnancy or the wish to become pregnant within 6 months * Renal disease * Liver disease * Age \< 18 years
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Correlation between the tracer uptake (counts) and beta cell mass (mg) | 4 years | The primary objective is the correlation between the ex vivo In-111-exendin tracer accumulation in the pancreas (counts) of patients undergoing pancreatectomy or Whipple procedure, and the beta cell mass (mg) in non- diabetic patients and patients with diabetes. |
Countries
Netherlands
Outcome results
None listed