Clinical trial NCT01775813: The Health Influences of Puberty (HIP) Study
Official title: Combined Influence of Puberty and Obesity on Insulin Resistance in Adolescents
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE4
Conditions: Obesity
Insulin Resistance
Gonadal Dysfunction
Type 2 Diabetes
Keywords: Insulin resistance
Puberty
Obesity
Hypogonadism
Gonadal dysfunction
Metformin
Lead sponsor: University of Colorado, Denver
Sponsor class: OTHER
Collaborators: name: American Diabetes Association
name: National Institutes of Health (NIH)
name: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
name: Children's Hospital Colorado
First posted: 2013-01-25
Enrollment: 104
Sex: ALL
Minimum age (years): 9
Maximum age (years): 17
Standard ages: CHILD
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: The Health Influences of Puberty (HIP) Study is designed to explore the relationships between puberty and the onset of type 2 diabetes in adolescents. The results of this study will help us better understand how to prevent type 2 diabetes in these youth. Children go through many changes during puberty, including important hormonal and behavioral alterations. Among these changes, it has long been known that, during puberty, insulin does not work as well as it does before and after puberty. This is called physiologic insulin resistance. In healthy children, this does not cause diabetes or affect blood sugar in any way because the body is able to compensate by making more insulin. Indeed, this is thought to be an important part of the adolescent growth spurt. However, in some children with increased risk for developing type 2 diabetes due to obesity and genetics, the worsening insulin resistance of puberty cannot be compensated for and these youth get diabetes early. The investigators believe this is because type 2 diabetes is rarely, if ever, seen before puberty begins, and the peak of diabetes onset in adolescents occurs at the time of the worst insulin resistance. This specific research project has two goals: 1. To examine effects of obesity on how well the body's insulin works during puberty, and 2. To see if treatment of obese children during this critical period of puberty with a medication that improves insulin resistance (metformin) will help prevent early onset type 2 diabetes.

Detailed description: Specific Aims:

Pediatric insulin resistance and related disorders, such as type 2 diabetes mellitus (T2DM), are increasing in prevalence, and portend significant end-organ and cardiovascular morbidity and mortality. Thus, measures aimed at understanding its causes and preventing its onset are critical. The physiologic decrease in insulin sensitivity in all adolescents during puberty is well-established. It is also known that obese adolescents start out less insulin sensitive at the onset of puberty than lean adolescents, and that their insulin sensitivity worsens as puberty progresses. While there are both longitudinal and cross-sectional data confirming the natural recovery of pre-pubertal insulin sensitivity in normal weight adolescents after puberty is completed, it is unknown whether obese adolescents recover their pre-pubertal insulin sensitivity. Failure to regain pre-pubertal insulin sensitivity at the end of puberty, and failure of compensatory insulin secretion, may accelerate progression from obesity to insulin resistance to T2DM in at-risk youth and contribute to long-term cardiovascular risk.

In addition, obesity and insulin resistance are associated with earlier onset of puberty and premature adrenarche in females. Insulin resistance also contributes to the gonadal dysfunction of polycystic ovarian disease in fully pubertal females and is associated with hypogonadism in older adult males. Little is known about effects of obesity and insulin resistance on gonadal function in young males. However, persistent metabolic changes at the end of puberty may contribute to gonadal dysfunction in obese youth. Currently, there are few longitudinal studies in either sex that evaluate the interactions among obesity, insulin resistance and gonadal function during puberty.

The investigators' long-term goal is to better understand the metabolic changes that occur during puberty, their underlying mechanisms, and their potential contribution to adult disease. The overall aim is to evaluate the effects of obesity on the evolution of insulin sensitivity and gonadal function during puberty. In addition, because improvement in insulin action during puberty may slow β-cell deterioration, the investigators will evaluate whether compensatory insulin secretion is also affected in obese adolescents and whether treatment with metformin improves β-cell response.

HYPOTHESES:

1. Obese adolescents will show decreased improvement in insulin sensitivity from Tanner stage 2/3 to Tanner 5 when compared with lean counterparts.
2. Obese adolescents treated with metformin will have greater improvement in insulin sensitivity from Tanner stage 2/3 to Tanner 5 vs. those treated with placebo. (See hypothesis schematics below)

To test these hypotheses, we propose to address the following Specific Aims:

SPECIFIC AIM 1 (Observational Arm):

1. To compare longitudinal changes in insulin sensitivity and secretion and their correlates in obese and normal weight adolescents during puberty.

   1. Primary outcome: Change in insulin sensitivity (Si), as measured by frequently sampled intravenous glucose tolerance test (IVGTT), from early puberty to puberty completion in obese and normal weight adolescents.
   2. Secondary outcomes: Change in insulin secretion (AIR) and disposition index (DI) as measured by IVGTT, body composition, fat distribution, markers of gonadal function, and inflammatory markers over time in these groups.

   SPECIFIC AIM 2 (Treatment Arm):
2. To compare longitudinal changes in insulin sensitivity and secretion and their correlates in obese adolescents treated with metformin or placebo during puberty.

   1. Primary outcome: Change in Si from early puberty to puberty completion in obese controls and obese adolescents treated with metformin.
   2. Secondary outcome: Change in AIR and DI, body composition, fat distribution, markers of gonadal function, and inflammatory markers over time in these groups.

Eligibility criteria: Inclusion Criteria:

* BMI ≥ 95th percentile
* At least Tanner 2, but no more than Tanner 3
* Age ≥ 9 years
* Absence of impaired glucose tolerance (IGT), impaired fasting glucose (IFG) or Type 2 diabetes mellitus (T2DM)

Exclusion Criteria:

* Presence of T2DM, IGT or IFG
* Any disorder or medication known to effect glucose tolerance;
* Hypertension or hyperlipidemia requiring pharmacological intervention;
* Weight \>300lbs. due to limits of imaging tables.
* Chronic illness

Primary outcomes:
measure: Insulin Sensitivity
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline, 6 mos post-treatment-average 3 yrs from baseline
Secondary outcomes:
measure: Insulin Secretion (Acute Insulin Response to Glucose, AIRg)
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline, 6 mos post-treatment-average 3 yrs from baseline
measure: Disposition Index
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline, 6 mos post-treatment-average 3 yrs from baseline
measure: Low Density Lipoprotein
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline, 6 mos post-treatment-average 3 yrs from baseline
measure: Insulin-like Growth Factor 1
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Total Testosterone
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Estradiol
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Sex Hormone Binding Globulin
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Dehydroepiandrosterone Sulfate
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: High Sensitivity C-reactive Protein
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Aspartate Aminotransferase (AST)
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Alanine Transaminase (ALT)
timeFrame: Baseline (Tanner 2-3), Tanner 4, Tanner 5
measure: Change in Urinary Luteinizing Hormone
timeFrame: Baseline, every 6 months during the trial, Final visit (average 3 yrs after baseline)
measure: Change in Urinary Follicle-stimulating Hormone
timeFrame: Baseline, every 6 months during the trial, Final visit-average 3 yrs after baseline
measure: Change in Urinary Estradiol Metabolites
timeFrame: Baseline, every 6 months during the trial, Final visit-average 3 yrs after baseline
measure: Hemoglobin A1c
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Leptin
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Percent Body Fat
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Visceral Adipose
timeFrame: Baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: Liver Adipose
timeFrame: Baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline
measure: High Density Lipoprotein
timeFrame: Baseline, Tanner (puberty) stage 4-average 1.5 years from baseline, Tanner (puberty) stage 5-average 2.5 yrs from baseline, 6 mos post-treatment-average 3 yrs from baseline
Other outcomes:
Locations:
city: Aurora
country: United States
facility: Children's Hospital Colorado
state: Colorado
Study officials:
affiliation: University of Colorado Denver/Children's Hospital Colorado
name: Megan Kelsey, MD, MS
role: PRINCIPAL_INVESTIGATOR
References:
citation: Kelsey MM, Hilkin A, Pyle L, Severn C, Utzschneider K, Van Pelt RE, Zeitler PS, Nadeau KJ. Two-Year Treatment With Metformin During Puberty Does Not Preserve beta-Cell Function in Youth With Obesity. J Clin Endocrinol Metab. 2021 Jun 16;106(7):e2622-e2632. doi: 10.1210/clinem/dgab170.
citation: Kelsey MM, Pyle L, Hilkin A, Severn CD, Utzschneider K, Van Pelt RE, Nadeau KJ, Zeitler PS. The Impact of Obesity On Insulin Sensitivity and Secretion During Pubertal Progression: A Longitudinal Study. J Clin Endocrinol Metab. 2020 May 1;105(5):e2061-8. doi: 10.1210/clinem/dgaa043.