Xenin-25: Novel Regulator of Insulin Secretion and Beta-cell Function
Phase 1
Completed
- Conditions
- Type 2 Diabetes Mellitus
- Interventions
- Drug: PlaceboDrug: Glucose-dependent Insulinotropic Polypeptide (GIP)Drug: Glucose-dependent Insulinotropic Polypeptide plus Xenin-25
- Registration Number
- NCT00949663
- Lead Sponsor
- Washington University School of Medicine
- Brief Summary
An intestinal hormone called Glucose-dependent Insulinotropic Polypeptide (GIP) is released into the blood immediately after ingestion of a meal and plays an important role in regulating blood sugar levels. However, GIP is not active in persons with type 2 diabetes mellitus (T2DM) which is also known as adult onset or non-insulin-dependent diabetes. This study is being conducted to determine whether a hormone called xenin-25 can restore the activity of GIP in persons with T2DM.
- Detailed Description
Each eligible participant will be administered an oral glucose tolerance test so he/she can be assigned to the group with "normal glucose tolerance", "impaired glucose tolerance" (between normal and diabetic), or type 2 diabetes mellitus. Each study subject will then be administered a meal tolerance test (MTT) on 4 separate occasions. For the MTT, a liquid meal (Boost Plus)will be ingested following an overnight fast. A primed-continuous infusion of vehicle alone, GIP alone, xenin-25 alone, or the combination of GIP plus xenin-25 (each peptide at a dose of 4 pmoles x kg-1 x min-1) will be initiated at the same time the meal is ingested. Blood samples will be collected before and during the MTT for the measurement of glucose, insulin, C-peptide, glucagon, GIP and xenin-25 levels.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 38
Inclusion Criteria
- Ages 18-65. No minors will be studied.
- Individuals must be able to consent for their own participation (no mental impairment affecting cognition or willingness to follow study instructions).
- Healthy volunteers with no clinical evidence of T2DM (see below).
- Otherwise healthy volunteers that have impaired glucose tolerance (see below).
- Otherwise healthy volunteers with Diet Controlled T2DM (see below).
- Otherwise healthy volunteers with T2DM that take oral agents only and if the subject's pre-existing oral anti-diabetic agents can be safely discontinued for 48 hours prior to Oral Glucose Tolerance Test.
- Otherwise healthy volunteers with T2DM who do not use insulin for blood glucose control.
- Persons with HbA1c ≤ 9%.
- Women of childbearing potential must be currently taking/using a method of birth control that is acceptable to the investigators. A pregnancy test will be done at the beginning of each visit. Any woman with a positive pregnancy test will be removed from the study.
- Willingness to return have 8-10ml of blood drawn 25-30 days after the last Xenin infusion; to check for Xenin peptide antibodies that MAY develop. (All efforts will be made to complete this visit during study participation.
Exclusion Criteria
- <18years of age or >65 years of age
- Lacks cognitive ability to sign the consent &/or follow the study directions for themselves
- Women unwilling to comply with using an acceptable method of contraception during the course of the study, or who are currently breast-feeding.
- Any subject whose screening HbA1c is >9.0%
- Type 2 diabetes requiring the use of supplemental insulin @ home
- Volunteers with a history of Acute Pancreatitis
- Volunteer with a history of Chronic Pancreatitis and/or risk factors for chronic pancreatitis including hypertriglyceridemia (triglycerides >400mg/ml) hypercalcemia (blood calcium level >11.md/dl) and/or the presence of gallstones.
- Volunteers with a history of gastrointestinal disorders, particularly related to gastric motility/emptying such as gastric bypass, documented gastro-paresis in diabetic volunteers.
- Volunteers with a history of cancer. Exception: skin cancer.
- Diabetics that have the potential to have a low blood sugar without them being aware that their blood sugar is low (hypoglycemia unawareness).
- Known heart, kidney. liver or pancreatic disease requiring medications.
- Subjects unwilling to allow the use of their own blood or the human albumin in the preparation of the peptides.
- Unwillingness to allow blood glucose level adjustment (if needed) with IV insulin.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- CROSSOVER
- Arm && Interventions
Group Intervention Description Normal Glucose Tolerance Glucose-dependent Insulinotropic Polypeptide (GIP) Healthy individuals exhibiting plasma glucose levels less than 140mg/dl two hours after ingestion of 75-g of glucose. Normal Glucose Tolerance Placebo Healthy individuals exhibiting plasma glucose levels less than 140mg/dl two hours after ingestion of 75-g of glucose. Impaired Glucose Tolerance Glucose-dependent Insulinotropic Polypeptide plus Xenin-25 Healthy individuals exhibiting plasma glucose levels between 140 and 199 mg/dl two hours after ingestion of 75-g of glucose. Type 2 Diabetes Mellitus Placebo Healthy individuals exhibiting plasma glucose levels greater than 150 mg/dL under fasting conditions OR greater than 199 mg/dl two hours after ingestion of 75-g of glucose. Normal Glucose Tolerance Xenin-25 Healthy individuals exhibiting plasma glucose levels less than 140mg/dl two hours after ingestion of 75-g of glucose. Impaired Glucose Tolerance Glucose-dependent Insulinotropic Polypeptide (GIP) Healthy individuals exhibiting plasma glucose levels between 140 and 199 mg/dl two hours after ingestion of 75-g of glucose. Type 2 Diabetes Mellitus Glucose-dependent Insulinotropic Polypeptide (GIP) Healthy individuals exhibiting plasma glucose levels greater than 150 mg/dL under fasting conditions OR greater than 199 mg/dl two hours after ingestion of 75-g of glucose. Type 2 Diabetes Mellitus Glucose-dependent Insulinotropic Polypeptide plus Xenin-25 Healthy individuals exhibiting plasma glucose levels greater than 150 mg/dL under fasting conditions OR greater than 199 mg/dl two hours after ingestion of 75-g of glucose. Normal Glucose Tolerance Glucose-dependent Insulinotropic Polypeptide plus Xenin-25 Healthy individuals exhibiting plasma glucose levels less than 140mg/dl two hours after ingestion of 75-g of glucose. Impaired Glucose Tolerance Xenin-25 Healthy individuals exhibiting plasma glucose levels between 140 and 199 mg/dl two hours after ingestion of 75-g of glucose. Impaired Glucose Tolerance Placebo Healthy individuals exhibiting plasma glucose levels between 140 and 199 mg/dl two hours after ingestion of 75-g of glucose. Type 2 Diabetes Mellitus Xenin-25 Healthy individuals exhibiting plasma glucose levels greater than 150 mg/dL under fasting conditions OR greater than 199 mg/dl two hours after ingestion of 75-g of glucose.
- Primary Outcome Measures
Name Time Method The effects of GIP, xenin-25, or a combination of GIP plus xenin-25 on insulin secretion and blood glucose levels 3 years
- Secondary Outcome Measures
Name Time Method We will develop an assay to measure the normal fasting and postprandial concentrations of endogenous xenin-25 and determine whether they are altered in T2DM. 3 years
Trial Locations
- Locations (1)
Washington University School of Medicine
🇺🇸St. Louis, Missouri, United States