Graded Insulin Suppression Test P&F

Inclusion Criteria

• •Body mass index of 18-25 and 30-45 kg/m2
• •Able to understand written and spoken English and/or Spanish
• •Fasting euinsulinemia (fasting serum insulin of 4-10 μU/mL) for reference group or hyperinsulinemia (fasting serum insulin ≥ 13 μU/mL) for hyperinsulinemic group on screening labs
• •Written informed consent (in English or Spanish) and any locally required authorization (e.g., Health Insurance Portability and Accountability Act) obtained from the participant prior to performing any protocol-related procedures, including screening evaluations.
• •Known, documented history, at the time of screening, of any of the following medical conditions:
• •* Pancreatic pathology, including but not limited to: Pancreatic neoplasia (unless appropriately evaluated and considered benign and not producing hormones), Chronic pancreatitis, History of acute pancreatitis within the past 5 years
• •* Cardiovascular diseases (N.B. uncomplicated hypertension is not exclusionary)
• •* Atherosclerotic cardiovascular disease
• •* Stable or unstable angina
• •* Myocardial infarction
• •* Ischaemic or hemorrhagic stroke
• •* Peripheral arterial disease (claudication)
• •* Use of dual antiplatelet therapy (aspirin + P2Y12 inhibitor)
• •* History of percutaneous coronary intervention
• •* Heart rhythm abnormalities (non-sinus)
• •* Congestive heart failure of any New York Heart Association class
• •* Severe valvular heart disease (e.g., aortic stenosis)
• •* Pulmonary hypertension
• •Chronic kidney disease, Stage 3 or higher (estimated glomerular filtration rate \< 60 mL/min/1.73 m2), of any cause
• •Advanced or severe liver disease, including but not limited to:
• •* Advanced liver fibrosis, as determined by non-invasive testing
• •* Cirrhosis of any etiology
• •* Autoimmune hepatitis or other rheumatologic disorder affecting the liver
• •* Biliopathy (e.g., progressive sclerosing cholangitis, primary biliary cholangitis)
• •* Hepatocellular carcinoma
• •* Infiltrative disorders (e.g., sarcoidosis, hemochromatosis, Wilson disease)
• •Gallstone disease, including:
• •* Biliary colic (active)
• •* History of acute cholecystitis not treated with cholecystectomy
• •* History of other gallstone complications (e.g., pancreatitis, cholangitis)
• •Chronic viral illness (N.B. diagnosis based only on medical history and not by laboratory confirmation)
• •Hepatitis B virus (HBV), unless previously successfully eradicated with antiviral drugs that have been discontinued for at least 30 d prior to screening
• •Hepatitis C virus (HCV) infection, unless previously successfully eradicated with antiviral drugs that have been discontinued for at least 30 d prior to screening
• •Human immunodeficiency virus (HIV) infection
• •Active seizure disorder (including controlled with antiepileptic drugs)
• •Psychiatric diseases causing functional impairment that:
• •* Are or have been decompensated within 1 year of screening, and/or
• •* Require use of anti-dopaminergic antipsychotic drugs associated with significant weight gain/metabolic dysfunction (e.g., clozapine, olanzapine), monoamine oxidase inhibitors, tricyclic antidepressants, or lithium
• •Other endocrinopathies:
• •* Cushing syndrome (okay if considered in remission after treatment, provided that no exogenous corticosteroids or other ongoing treatment are required)
• •* Adrenal insufficiency
• •* Primary aldosteronism
• •Venous thromboembolic disease (deep vein thrombosis or pulmonary embolism) or any required use of therapeutic anticoagulation
• •Bleeding disorders, including due to anticoagulation, or significant anemia
• •Active malignancy, or hormonally active benign neoplasm, except allowances for:
• •* Non-melanoma skin cancer
• •* Differentiated thyroid cancer (AJCC Stage I only)
• •Clinical concern for increased risk of volume overload, including due to medications and/or heart/liver/kidney problems, as listed above
• •Clinical concern for increased risk of hypokalemia, including low potassium on screening labs (i.e., below lower limit of normal), use of certain medications, or any medical conditions listed above
• •Use of prescribed medications used for any of the indications in the preceding list of excluded conditions, or their use within 30 d prior to screening, except allowances for:
• •* Use of drugs prescribed for indications other than the exclusionary diagnoses/purposes listed above (e.g., antiepileptic drugs used for non-seizure indications, ACEi/ARB used for uncomplicated hypertension rather than for congestive heart failure, etc.). Note, as above, that antidiabetic drugs except metformin within 30 d of screening are excluded.
• •Oral or parenteral corticosteroids (at greater than prednisone 5 mg daily, or equivalent) for more than 3 days within the previous 30 days; topical and inhaled formulations are permitted.
• •Beta blockers or non-dihydropyridine calcium channel blockers (verapamil or diltiazem)
• •History of certain weight-loss (bariatric) surgery, including:
• •* Roux-en-Y gastric bypass
• •* Biliopancreatic diversion
• •* Restrictive procedures (lap band, sleeve gastrectomy) performed within the past 6 months
• •Clinical concern for alcohol overuse, including recent documented history during screening and/or participant report of regularly consuming more than 2 drinks per day for males or 1 drink per day for females.
• •History of severe infection or ongoing febrile illness within 14 days of screening
• •Any other disease, condition, or laboratory value that, in the opinion of the investigator, would place the participant at an unacceptable risk and/or interfere with the analysis of study data.
• •Known allergy/hypersensitivity to any component of the medicinal product formulations, foods, IV infusion equipment, plastics, adhesive or silicone, history of infusion site reactions with IV administration of other medicines, or ongoing clinically important allergy/hypersensitivity as judged by the investigator.
• •Concurrent enrollment in another clinical study of any investigational drug therapy within 30 days prior to screening or within 5 half-lives of an investigational agent, whichever is longer.