Low Dose Growth Hormone (GH) on Insulin Sensitivity and Cortisol Production Rates
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Purpose
Study hypothesis:
Growth hormone (GH), through its generation of free 'bioavailable' insulin-like growth factor (IGF)-I, can improve insulin sensitivity in adults with GH deficiency.
Study aims:
The purpose of this study is to determine the mechanism of how low dose GH treatment affects the body's sensitivity to insulin actions and whether this low GH dose can affect the body's handling of steroid hormone levels (cortisol clearance) in adults with GH deficiency.
Study design:
Men and women with confirmed GH deficiency, but not recently been on GH treatment will be invited to participate in this study. The subjects will be assessed at the initial visit to ascertain their suitability before further participating in the study. If suitable, an equal number of men and women will be randomized to receive either low dose GH or placebo injection for 3 months. Before, during and after treatment, the subjects will be assessed at regularly with blood tests, scans and fat biopsies. At the first and final visit, testing will include scans to measure the amount of whole body fat and fat in the stomach area, muscle, and liver; blood tests to measure levels of cortisol, and fat tissue (taken from a biopsy) analysis to measure the density of IGF-I in the muscle; whereas blood tests to examine insulin sensitivity will also be collected. This study will use Genotropin and Genotropin pen devices, and the the data will be analyzed using a computer statistical program where the identity of the subjects will be coded to maintain confidentiality.
| Condition | Intervention | Phase |
|---|---|---|
|
Growth Hormone Deficiency |
Drug: Growth hormone (Genotropin) Drug: Placebo |
Phase 0 |
| Study Type: | Interventional |
| Study Design: | Allocation: Randomized Endpoint Classification: Safety/Efficacy Study Intervention Model: Parallel Assignment Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor) Primary Purpose: Treatment |
| Official Title: | Effects of Low Dose Growth Hormone (GH) Therapy on Insulin Sensitivity, Adipocyte Insulin-like Growth Factor-I (IGF-I) and IGF-I/Insulin Receptor Density and Regulation of Cortisol Metabolism in GH Deficient Adults |
- Changes in insulin sensitivity (from the hyperinsulinemic euglycemic clamp [ Time Frame: 3 months ] [ Designated as safety issue: Yes ]
- Changes in fat IGF-I and IGF-I/insulin hybrid receptor density and body composition. [ Time Frame: 3 months ] [ Designated as safety issue: Yes ]
| Enrollment: | 16 |
| Study Start Date: | January 2006 |
| Study Completion Date: | January 2012 |
| Primary Completion Date: | January 2012 (Final data collection date for primary outcome measure) |
| Arms | Assigned Interventions |
|---|---|
|
Active Comparator: A
Growth hormone
|
Drug: Growth hormone (Genotropin)
Growth hormone 0.1 mg self-injected once a day subcutaneously at bedtime.
Other Name: Genotropin
|
|
Placebo Comparator: B
Placebo
|
Drug: Placebo
Placebo self-injected once a day subcutaneously at bedtime.
Other Name: Placebo.
|
Detailed Description:
The study will be double-blinded. One hundred subjects will be screened for eligibility initially, and 24 subjects will be enrolled with 12 subjects being randomized to receive the low GH dose (0.1 mg/day) treatment and 12 subjects to receive Placebo treatment for 3 months, allowing a 10% drop-out rate. The subjects will be taught by either by the Endocrine Nurse Specialists to self-administer the GH by subcutaneous injections using a Genotropin pen device.
Visit 1, Initial Screening Assessment (as out-patient)
- Physical examination, weight, height, and waist circumference measurements
- Fasting blood glucose levels
Visit 2, Baseline Assessment (as in-patient)
- Physical examination, weight, height, and waist circumference measurements
- Fasting blood tests for glucose, insulin, C-peptide, free IGF-I, total IGF-I, IGF-2, IGFBPs -1 and -3, non-esterified fatty acid and lipid profiles
- MRS, abdominal CT and DEXA scans
- One-step 3-hour hyperinsulinaemic euglycaemic clamp
- Cortisol production rates and urine cortisol collections
- Fat biopsies will be taken at the end of the assessment of cortisol production rates
Visit 3, Interim Assessment (Month 1) (as out-patient)
- Documentation of any adverse effects
- Fasting blood tests for glucose, insulin, C-peptide, free IGF-I, total IGF-I, IGF-2, IGFBPs -1 and -3
Visit 4, Final Assessment (Month 3) (as in-patient)
- Physical examination, weight, height, and waist circumference measurements
- Fasting blood tests for glucose, insulin, C-peptide, free IGF-I, total IGF-I, IGF-2, IGFBPs -1 and -3, non-esterified fatty acid and lipid profiles
- MRS, abdominal CT and DEXA scans
- One-step 3-hour hyperinsulinaemic euglycaemic clamp
- Cortisol production rates and urine cortisol collections
- Fat biopsies will be taken at the end of the assessment of cortisol production rates
Any extra blood remaining from the samples of blood drawn may be banked indefinitely with confidential identifiers, and may be given to researchers in the future to examine for other potential causes of diabetes and heart diseases in adults. These blood samples, however, will not be used for genetic studies.
Eligibility| Ages Eligible for Study: | 18 Years to 75 Years |
| Genders Eligible for Study: | Both |
| Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Age range 18 to 75 years
- BMI should not exceed 40 kg/m2
- Confirmed GH deficient with at least one provocative test, e.g. insulin tolerance test and/ or GHRH/arginine
- Not received any GH therapy within last 6 months
- On a stable standardized hydrocortisone replacement dose regimen (twice a day at 8 AM and 4 PM),
- If any other pituitary hormone deficiencies are present, patient must be on optimal pituitary hormone replacement therapy, e.g. Thyroxine, testosterone and oestrogen replacement
- Normal renal and hepatic function
- Prepared to self-inject
Exclusion Criteria:
- Untreated or subclinically hypo/hyperthyroid
- Untreated or subclinically treated hypocortisolism
- Type 1 or 2 diabetes mellitus
- Subjects with evidence of nephropathy from any cause
- Subjects with evidence of retinopathy from any cause
- Any other medical illnesses that may affect the interpretation of the results
- Pregnant
- Emotional/social instability likely to prejudice study completion
- Previous history of known malignancy
- Recurrent or severe unexplained hypoglycaemia
- Known or suspected drug/alcohol abuse
Contacts and Locations| United States, Oregon | |
| Oregon Health and Science University | |
| Portland, Oregon, United States, 97239 | |
| Principal Investigator: | Jonathan Q. Purnell, MD | Oregon Health and Science University |
| Principal Investigator: | Charles T. Roberts, PhD | Oregon Health and Science University |
More Information
Additional Information:
Publications:
| Responsible Party: | Kevin Yuen, Principal Investigator, Oregon Health and Science University |
| ClinicalTrials.gov Identifier: | NCT00517062 History of Changes |
| Other Study ID Numbers: | IRB1844 |
| Study First Received: | August 15, 2007 |
| Last Updated: | May 2, 2012 |
| Health Authority: | United States: Institutional Review Board |
Keywords provided by Oregon Health and Science University:
|
Growth hormone insulin sensitivity cortisol |
Additional relevant MeSH terms:
|
Dwarfism, Pituitary Endocrine System Diseases Insulin Resistance Dwarfism Bone Diseases, Developmental Bone Diseases Musculoskeletal Diseases Bone Diseases, Endocrine Hypopituitarism Pituitary Diseases Hypothalamic Diseases Brain Diseases Central Nervous System Diseases |
Nervous System Diseases Hyperinsulinism Glucose Metabolism Disorders Metabolic Diseases Hormones Insulin Hydrocortisone Hormones, Hormone Substitutes, and Hormone Antagonists Physiological Effects of Drugs Pharmacologic Actions Hypoglycemic Agents Anti-Inflammatory Agents Therapeutic Uses |
ClinicalTrials.gov processed this record on May 23, 2013