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Beta-cell Response to Incretin Hormones in Cystic Fibrosis

This study is currently recruiting participants. (see Contacts and Locations)
Verified November 2016 by University of Pennsylvania
Children's Hospital of Philadelphia
Information provided by (Responsible Party):
University of Pennsylvania Identifier:
First received: May 8, 2013
Last updated: November 7, 2016
Last verified: November 2016

In recent years, diabetes has emerged as one of the most significant co-diseases that many Cystic Fibrosis (CF) patients develop. Type 1 (T1D) and Type 2 (T2D) diabetes results when either the body does not make enough insulin or the body does not respond correctly to this insulin, respectively. Insulin is a hormone which is made by cells in the pancreas and helps carry glucose (sugar) from the food we eat to the cells of the body for energy. While cystic fibrosis related diabetes (CFRD) has many features similar to both T1D and T2D, patients with CF may not have the same symptoms as either T1D or T2D patients. Currently, there is little understanding of CFRD and the best options for treatment remain unclear.

The purpose of this research study is to examine and understand the various mechanisms that contribute to CFRD and gain a better understanding of potential means to treat CFRD. In particular, we plan to study the effects of incretin hormones that can enhance insulin production in CF patients.

Condition Intervention
Cystic Fibrosis
Pancreatic Insufficiency
Drug: GLP-1
Drug: GIP

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Official Title: Determination of Beta-cell Responsiveness to the Incretin Hormones GLP-1 and GIP in Cystic Fibrosis

Resource links provided by NLM:

Further study details as provided by University of Pennsylvania:

Primary Outcome Measures:
  • Second-phase insulin response during GPA test [ Time Frame: 5 hours ]
    The key endpoint of interest will be the change in second phase insulin response derived from the Glucose-Potentiated Arginine (GPA) test. The GPA test will measure insulin (and other glucose controlling hormones) which will be a measure of pancreatic endocrine function in response to injection of arginine. Arginine is a naturally occurring amino acid (substance) in the body. It will be given in the veins to make the pancreas secrete insulin. After the first injection of arginine, a glucose infusion will be started in order to raise the level of sugar in the blood to 230 mg/dl. Once the level is achieved, arginine will be injected again and blood samples are measured. After a 2 hour break, the glucose infusion will be started to achieve a blood sugar of 340mg/dl and arginine injection will be repeated. Comparison of responses with incretin vs. placebo will be performed using statistical methods, specifically, paired t-test or Wilcoxon matched pair test.

Secondary Outcome Measures:
  • Change in insulin secretion among CF groups [ Time Frame: 5 hours ]
    The change in second phase insulin secretion induced by incretins will be compared among the different subgroups of patients with CF (Ind-GT, IGT, and early CFRD) groups using nonparametric comparison of changes in slope, estimated using Mann-Whitney methods.

Estimated Enrollment: 45
Study Start Date: May 2013
Estimated Study Completion Date: September 2017
Estimated Primary Completion Date: September 2017 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: GLP-1
The incretin, Glucagon-Like-peptide-1 (GLP-1) will be infused into the veins starting 30 minutes prior to initiating the GPA test. This infusion will continue for a total of 90 mins. (during the GPA for 230 mg/dL glucose levels) and then this will be stopped. The GPA test will be performed for the 340 mg/dL glucose levels but no incretin will be infused during this part of the test. These data will be compared when the subject repeats the GPA test with a placebo (saline or salt containing solution) infusion.
Drug: GLP-1
Each subject in this arm will receive GLP-1 infusion and a placebo infusion during a GPA test.
Experimental: GIP
The incretin, Glucose-dependent Insulinotropic Polypeptide (GIP) will be infused into the veins starting 30 minutes prior to initiating the GPA test. This infusion will continue for a total of 90 mins (during the GPA for 230 mg/dL glucose levels) and then this will be stopped. The GPA test will be performed for the 340 mg/dL glucose levels but no incretin will be infused during this part of the test. These data will be compared when the subject repeats the GPA test with a placebo (saline or salt containing solution) infusion.
Drug: GIP
Each subject in this arm will receive GIP infusion and placebo during a GPA test.
Other Name: Glucose-dependent insulinotrophic polypeptide

Detailed Description:
Previously, cystic fibrosis related diabetes (CFRD) was considered to be a consequence of damage to the pancreas therefore the cells contained in the pancreas--i.e.--islets that house beta cells, which make and release insulin (similar to T1D). Recent evidence suggests that other factors may also be associated that are similar to those with T2D. For example, patients with T2D, have decreased secretion of incretins, hormones released by the small intestine in response to nutrients from food which act, among other things, to increase insulin secretion from Beta cells of the pancreas. When patients with T2D are treated with incretin hormones, their pancreatic Beta cells release more insulin (measured as 'second phase insulin secretion'). Currently, we do not know if patients with CFRD have decreased incretin secretion like T2D or if treating CFRD patients with incretin hormones will improve their insulin levels. This study will measure insulin release from the Beta cells from CFRD patients (second phase insulin secretion) that are being given incretin hormones in the veins. This will be compared with insulin release when the same patients are given a placebo (salt containing solution). The patients and the research team will not know what is being given until all the results are collected. The results will provide unbiased evidence if incretins will help improve insulin release in CFRD patients.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Confirmed diagnosis of cystic fibrosis, defined by positive sweat test or CFTR mutation analysis according to CFF diagnostic criteria,
  2. Age greater than or equal to 18y on date of consent
  3. Pancreatic insufficiency
  4. Recent OGTT consistent with Indeterminate-GT, IGT, CFRD w/o fasting hyperglycemia, or an established diagnosis of CFRD without fasting hyperglycemia
  5. For female subjects, negative urine pregnancy test at enrollment.

Exclusion Criteria:

  1. Established diagnosis of non-CF diabetes (i.e. T1D) or CFRD with fasting hyperglycemia (fasting glucose greater than126 mg/dL)
  2. History of clinically symptomatic pancreatitis within last year
  3. Prior lung or liver transplant
  4. Severe CF liver disease, as defined by portal hypertension
  5. Fundoplication-related dumping syndrome
  6. Medical co-morbidities that are not CF-related or are unstable per investigator opinion (i.e. history of bleeding disorders, immunodeficiency)
  7. Acute illness or changes in therapy (including antibiotics) within 6 weeks prior to study procedures
  8. Treatment with oral or intravenous corticosteroids within 6 weeks of study
  9. Hemoglobin less than10g/dL, within 90 days of Visit 1 or at Screening
  10. Abnormal renal function, within 90 days of Visit 1 or at Screening; defined as Creatinine greater than 2x upper limit of normal (ULN) or potassium greater than 5.5mEq/L on non-hemolyzed specimen
  11. Inability to perform study specific procedures (MMTT, GPA)
  12. Subjects, who in study team opinion, may be non-compliant with study procedures.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01851694

Contact: Christina Kubrak
Contact: Jack N Eiel 215-746-2081

United States, Pennsylvania
Children's Hospital of Philadelphia and University of Pennsylvania Recruiting
Philadelphia, Pennsylvania, United States, 19060
Contact: Christina Kubrak    267-426-5135   
Principal Investigator: Michael Rickels, M.D., M.S         
Principal Investigator: Andrea Kelly, M.D, M.S.         
Sponsors and Collaborators
University of Pennsylvania
Children's Hospital of Philadelphia
Principal Investigator: Michael R. Rickels, MD, MS University of Pennsylvania
  More Information

Responsible Party: University of Pennsylvania Identifier: NCT01851694     History of Changes
Other Study ID Numbers: 817585
Study First Received: May 8, 2013
Last Updated: November 7, 2016
Individual Participant Data  
Plan to Share IPD: Yes
Plan Description: Upon completion of enrollment.

Keywords provided by University of Pennsylvania:
Cystic Fibrosis
Pancreatic insufficiency

Additional relevant MeSH terms:
Cystic Fibrosis
Exocrine Pancreatic Insufficiency
Pathologic Processes
Pancreatic Diseases
Digestive System Diseases
Lung Diseases
Respiratory Tract Diseases
Genetic Diseases, Inborn
Infant, Newborn, Diseases
Glucagon-Like Peptide 1
Gastric Inhibitory Polypeptide
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs
Gastrointestinal Agents processed this record on May 25, 2017