Growth Hormone Administration and the Human Immune System
| Status: | Completed |
|---|---|
| Conditions: | Healthy Studies |
| Therapuetic Areas: | Other |
| Healthy: | No |
| Age Range: | 20 - 50 |
| Updated: | 12/7/2018 |
| Start Date: | October 19, 2006 |
| End Date: | October 6, 2014 |
Background:
- In elderly individuals, an age-associated decline in the immune system s ability to
function is believed to contribute to increased incidence of infection, autoimmune disorders,
and cancer. This decline in immune system function may be related to the decline in the body
s production of growth hormone, which helps regulate human development and may contribute to
the health of the immune system. Researchers are interested in studying whether growth
hormone, given as an infusion over time, can improve the function of the immune system and
other body systems associated with good health.
Objectives:
- To study the effects of growth hormone administration on the immune systems of healthy men.
Eligibility:
- Healthy men between 25 and 50 years of age.
Design:
- This protocol will involve three separate studies: Study I, Study IB, and Study II.
Participants in Study I and Study IB may participate in Study II as directed by the
researchers.
- Participants will be screened with a full medical history and physical examination, and
will provide blood, urine, and stool samples; have a glucose tolerance test; and have
other tests as required by the researchers.
- Participants will have an infusion pump with a small catheter inserted beneath the skin
to administer the study chemicals (either growth hormone or placebo).
- Study I and Study IB participants will receive pulses of growth hormone through the
infusion pump at regular intervals to monitor the body s response to the hormone. Study
IB participants will receive a higher dose of growth hormone than Study I participants.
- Throughout the study period, all participants will have frequent blood and urine tests,
as well as tests of glucose tolerance and metabolism, imaging studies, and other tests
as required by the researchers.
- Study II participants will be divided into two groups. The first group will receive
pulses of either growth hormone or placebo infusion at intervals throughout the day for
4 weeks, followed by an 8-week period without infusions. The second group will receive
conventional once-a-day infusion of growth hormone or placebo for 4 weeks, followed by
an 8-week period without infusions.
- Throughout the study period, all participants will have frequent blood and urine tests,
as well as tests of glucose tolerance and metabolism, imaging studies, and other tests
as required by the researchers.
- In elderly individuals, an age-associated decline in the immune system s ability to
function is believed to contribute to increased incidence of infection, autoimmune disorders,
and cancer. This decline in immune system function may be related to the decline in the body
s production of growth hormone, which helps regulate human development and may contribute to
the health of the immune system. Researchers are interested in studying whether growth
hormone, given as an infusion over time, can improve the function of the immune system and
other body systems associated with good health.
Objectives:
- To study the effects of growth hormone administration on the immune systems of healthy men.
Eligibility:
- Healthy men between 25 and 50 years of age.
Design:
- This protocol will involve three separate studies: Study I, Study IB, and Study II.
Participants in Study I and Study IB may participate in Study II as directed by the
researchers.
- Participants will be screened with a full medical history and physical examination, and
will provide blood, urine, and stool samples; have a glucose tolerance test; and have
other tests as required by the researchers.
- Participants will have an infusion pump with a small catheter inserted beneath the skin
to administer the study chemicals (either growth hormone or placebo).
- Study I and Study IB participants will receive pulses of growth hormone through the
infusion pump at regular intervals to monitor the body s response to the hormone. Study
IB participants will receive a higher dose of growth hormone than Study I participants.
- Throughout the study period, all participants will have frequent blood and urine tests,
as well as tests of glucose tolerance and metabolism, imaging studies, and other tests
as required by the researchers.
- Study II participants will be divided into two groups. The first group will receive
pulses of either growth hormone or placebo infusion at intervals throughout the day for
4 weeks, followed by an 8-week period without infusions. The second group will receive
conventional once-a-day infusion of growth hormone or placebo for 4 weeks, followed by
an 8-week period without infusions.
- Throughout the study period, all participants will have frequent blood and urine tests,
as well as tests of glucose tolerance and metabolism, imaging studies, and other tests
as required by the researchers.
Objectives and Specific Aims:
We plan to investigate whether growth hormone, administered in a physiological or pulsatile
fashion, can elicit relevant changes in the human immune system while at the same time
associated with no change or even an improvement in the metabolic profiles such as insulin
sensitivity.
Experimental Design and Methods:
Thirty-eight healthy men, age 25-50, will be recruited for this study. There are three parts
to this study: Study I, Study IB and Study II. Study I and IB each involve six subjects and
are designed to test the hypothesis that pulsatile subcutaneous infusion of GH via a
subcutaneous infusion pump will yield a reasonable pulsatile GH pattern. The dose of GH used
in Study IB will be three-fold higher that that in Study I. Study I and IB will be done first
before proceeding to Study II.
Study II is a randomized, double-blinded, placebo-controlled 12-week study involving 26
subjects divided into 2 groups: Group A and Group B. Group A will involve 13 subjects
receiving pulsatile GH or placebo infusion for 4 weeks with 8-week washout after
intervention. Group B will involve 13 subjects receiving conventional once a day subcutaneous
infusion of GH or placebo for 4 weeks with 8-week washout after intervention.
Medical Relevance and Expected Outcome:
This study will ascertain the significance of the effect of pulsatile growth hormone
administration on the human immune system and metabolic profile.
We plan to investigate whether growth hormone, administered in a physiological or pulsatile
fashion, can elicit relevant changes in the human immune system while at the same time
associated with no change or even an improvement in the metabolic profiles such as insulin
sensitivity.
Experimental Design and Methods:
Thirty-eight healthy men, age 25-50, will be recruited for this study. There are three parts
to this study: Study I, Study IB and Study II. Study I and IB each involve six subjects and
are designed to test the hypothesis that pulsatile subcutaneous infusion of GH via a
subcutaneous infusion pump will yield a reasonable pulsatile GH pattern. The dose of GH used
in Study IB will be three-fold higher that that in Study I. Study I and IB will be done first
before proceeding to Study II.
Study II is a randomized, double-blinded, placebo-controlled 12-week study involving 26
subjects divided into 2 groups: Group A and Group B. Group A will involve 13 subjects
receiving pulsatile GH or placebo infusion for 4 weeks with 8-week washout after
intervention. Group B will involve 13 subjects receiving conventional once a day subcutaneous
infusion of GH or placebo for 4 weeks with 8-week washout after intervention.
Medical Relevance and Expected Outcome:
This study will ascertain the significance of the effect of pulsatile growth hormone
administration on the human immune system and metabolic profile.
- INCLUSION CRITERIA:
1. Healthy men only
2. Age 25-50
3. Screening laboratory evaluations with no clinically significant abnormal results
(minor deviations from normal lab results will be at the discretion of the
principal investigator):
1. fasting comprehensive metabolic panel
2. complete blood count with differential and platelets
3. 75-gram oral glucose tolerance test (OGTT)
- fasting plasma glucose (FPG) < 100 mg/dL
- 2-hr OGTT < 140 mg/dL
4. Insulin-like growth factor-I (IGF-I)
5. thyroid function test (TSH, free T3, free T4)
6. fasting lipid profile
4. BMI < 30
5. Have NOT participated in another clinical trial involving any pharmacologic
agents within the past 60 days
6. Able to complete an inform consent
7. Agree to not participate in other clinical trials within the study period
EXCLUSION CRITERIA:
1. Women
2. FPG 100 mg/dL or 2-hour OGTT 140 mg/dL
3. Abnormal electrocardiogram (EKG) suggesting possible underlying cardiac conditions
that, in the opinion of the investigator(s), may cause participation of the subject in
the study unsafe
4. Positive stool guaiac
5. Evidence of illicit drug use
6. History of smoking any tobacco products within one year prior to screening
7. Alcohol intake > 30 grams (drink more than 2 beers per day OR equivalent amount of
alcohol)
8. History of Human Immunodeficiency Virus (HIV) infection
9. History of active or chronic Hepatitis B and/or C infection
10. History of malignancy
11. History of coronary disease
12. History of seizures or other neurologic diseases
13. History of liver or renal diseases
14. History of gastrointestinal or endocrine disorders
15. History of glucocorticoid use (over one month) or other immunosuppressive agents (any)
16. unable to undergo a magnetic resonance imaging (MRI) procedure
17. Any medical history that, in the opinion of the investigator(s), will make
participation of the subject in the study unsafe
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