Clinical trial NCT01581736: Molecular Regulation of Muscle Glucose Metabolism
Official title: Molecular Regulation of Muscle Glucose Metabolism
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: PHASE1
Conditions: Obesity
Type 2 Diabetes Mellitus
Keywords: insulin resistance
mitochondria
Lead sponsor: Mayo Clinic
Sponsor class: OTHER
Collaborators: name: Arizona State University
First posted: 2012-04-20
Enrollment: 48
Sex: ALL
Minimum age (years): 30
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: BASIC_SCIENCE

Brief summary: This protocol is being conducted to determine the mechanisms responsible for insulin resistance, obesity and type 2 diabetes.

Detailed description: This protocol involves performance of a hyperinsulinemic euglycemic clamp with 2 muscle biopsies and an exercise study with a muscle biopsy.

Eligibility criteria: Inclusion Criteria:

1. Subjects must be able to communicate meaningfully with the investigator and must be legally competent to provide written informed consent.
2. Subjects may be of either sex, age as described in each protocol. Female subjects must be non-lactating and must either be at least two years post-menopausal, (if diabetic or obese) or be using adequate contraceptive precautions (i.e. oral contraceptives, approved hormonal implant, intrauterine device, diaphragm with spermicide, condom with spermicide), or be surgically sterilized (i.e. bilateral tubal ligation, bilateral oophorectomy). Female patients (except for those patients who have undergone a hysterectomy or bilateral oophorectomy) are eligible only if they have a negative pregnancy test throughout the study period.
3. Subjects must range in age as described in each specific protocol.
4. All nondiabetic subjects must have normal oral glucose tolerance.
5. Subjects must have the following laboratory values:

   1. Hematocrit ≥ 35 vol%
   2. Serum creatinine ≤ 1.6 mg/dl
   3. Aspartate aminotransferase (AST) (SGOT) \< 2 times upper limit of normal
   4. Alanine aminotransferase (ALT) (SGPT) \< 2 times upper limit of normal
   5. Alkaline phosphatase \< 2 times upper limit of normal
   6. Triglycerides \< 150 mg/dl.
   7. Prothrombin time (PT) 11.7 -14.3 (During Liposyn/heparin infusion, PT will be determined to insure that it is \< 1.5-2.0 times the normal value.)
   8. Partial thromboplastin time (PTT) 23.0-37.0.

Exclusion Criteria:

1. Subjects must not be receiving any of the following medications: thiazide or furosemide diuretics, beta-blockers, or other chronic medications with known adverse effects on glucose tolerance levels unless the patient has been on stable dose of such agents for the past three months before entry into the study. Subjects may be taking a stable dose of estrogens or other hormonal replacement therapy, if the subject has been on these agents for the prior three months. Subjects taking systemic glucocorticoids are excluded.
2. Subjects with a history of clinically significant heart disease (New York Heart Classification greater than grade II; more than non-specific ST-T wave changes on the EKG), peripheral vascular disease (history of claudication), or pulmonary disease (dyspnea on exertion of one flight or less; abnormal breath sounds on auscultation) will not be studied.
3. Recent systemic or pulmonary embolus, untreated high-risk proliferative retinopathy, recent retinal hemorrhage, uncontrolled hypertension, systolic BP \> 180, diastolic BP \> 105, autonomic neuropathy, resting heart rate \> 100, electrolyte abnormalities.

Primary outcomes:
measure: insulin sensitivity
timeFrame: one month from date of volunteer study
Secondary outcomes:
measure: acetylation of mitochondrial adenine nucleotide translocase
timeFrame: within 6 months of volunteer study
Other outcomes:
Locations:
city: Scottsdale
country: United States
facility: Mayo Clinic in Arizona
state: Arizona
Study officials:
affiliation: Mayo Clinic
name: Lori Roust, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Mayo Clinic
name: Lawrence J. Mandarino, PhD
role: PRINCIPAL_INVESTIGATOR
References: