Effects of RM-493 on Energy Expenditure in Obese Individuals
Effects of RM-493 on Energy Expenditure in Obese Individuals
Background:

 - RM-493 is a drug that stimulates parts of the brain that control eating and metabolism. It
 has helped to reduce body weight and improve insulin sensitivity in lab tests. However, it is
 not fully known whether RM-493 causes weight loss by just decreasing appetite or by
 increasing metabolism or both. Researchers want to see how RM-493 affects metabolism and
 hormones that affect the metabolic rate. They also want to see how RM-493 affects appetite by
 assessing feelings of hunger and fullness. They will study this drug in people who are obese
 but are otherwise in good health.

 Objectives:

 - To see how RM-493 affects metabolic rate and appetite in obese but otherwise healthy
 individuals.

 Eligibility:

 - Individuals between 18 and 50 years old who are obese (body mass index between 30 and 40
 kg/m2) but are otherwise healthy.

 Design:

 -  The study consists of three phases. The first phase is the screening visit. The second
 phase is an 8-day inpatient stay. The final phase is a follow-up phone call one week
 after the end of the second phase.

 -  Participants will be divided into two groups. One group will receive the study drug
 first, followed by a placebo. The other group will receive the placebo followed by the
 study drug. The study drug and placebo will be given under the skin for 3 days each by a
 small device (OmniPod) that normally is used to give insulin to people with diabetes.

 -  Participants will be screened with a physical exam and medical history. Blood and urine
 samples will be collected. They will also meet with a dietitian. The OmniPod device will
 be demonstrated before use.

 -  Participants will have the following procedures during their 8-day inpatient stay:

 -  Daily exercise routine (walking on treadmill) after setting a comfortable pace (miles
 per hour) during an exercise test

 -  Wear physical activity monitors

 -  Body composition study to measure amounts of fat and muscle

 -  Calorie controlled study diet

 -  Study drug/placebo dose through the OmniPod (Days 2 through 4 and 5 through 7)

 -  Metabolic rate studies using a cart or the metabolic chamber

 -  Daily blood samples

 -  Urine collection for 24 hours

 -  Questions about weight history and appetite

 -  About a week after the inpatient stay, participants will have a followup phone call to
 ask about any side effects from the study.
Obesity is a chronic relapsing health problem and a strong risk factor for type 2 diabetes,
 hypertension, heart disease and stroke. Life expectancy is shorter in obese individuals who
 often suffer from costly related co-morbidities such as certain cancers, liver disease,
 osteoarthritis, sleep apnea and depression. Weight loss improves the co-morbidities. Diet and
 exercise are effective in the short term, but are rarely effective over a span of years. New
 therapies are needed especially for patients with obesity. The melanocortin system, and
 specifically, melanocortin 4 receptor (MC4R) is involved in the regulation of energy
 homeostasis and body weight. This role is validated in human genetic mutations, and in animal
 models of obesity, stimulation of MC4R reduces food intake and increases metabolic rate,
 causing a reduction in body weight.

 RM-493 is a potent, selective peptide agonist for the MC4R that suppressed food intake and
 reduced body weight in preclinical studies. RM-493 has been studied in single dose and
 multiple ascending dose clinical studies in obese volunteers. This study is a randomized,
 double-blind, placebo-controlled, multiple-dose, 2-period, crossover study to assess the
 effects of RM-493 on resting energy expenditure measured in a room calorimeter. Twelve obese
 but otherwise healthy adult subjects between the ages of 18 and 50 inclusive, will be
 enrolled and randomized to one of 2 treatment sequences (RM-493 then placebo; or placebo then
 RM-493) over an 8-day study interval. Components of 24-hour energy expenditure, exercise
 induced energy expenditure, spontaneous physical activity, respiratory quotient, safety and
 pharmacokinetic data will be collected.
-  INCLUSION CRITERIA:

 Male and female subjects aged 18 to 50 years at screening who meet the following inclusion
 and exclusion criteria will be eligible for enrollment:

 -  Able to provide written informed consent prior to any study procedures, and be willing
 and able to comply with study procedures

 -  Body mass index of 30-40 kg/m(2)

 -  Subjects who are medically healthy with normal or clinically insignificant screening
 results (laboratory profiles, medical histories, electrocardiograms and physical
 examination)

 -  Female subjects must have negative serum or urine pregnancy tests and must not be
 lactating. For females able to bear children, a hormonal (i.e., oral, implantable, or
 injectable) and single-barrier method, or a double-barrier method of birth control or
 abstinence must be used/ practiced throughout the study. Female subjects unable to
 bear children must have this documented in the case report form (CRF) (i.e., tubal
 ligation, hysterectomy, or post-menopausal [defined as a minimum of one year since the
 last menstrual period]). Post-menopausal status will be confirmed by follicle
 stimulating hormone (FSH).

 -  Female subjects must have a negative serum pregnancy test prior to administering the
 OmniPod in both Period 1 and Period 2 to continue in the study.

 -  Males with female partners of childbearing potential must agree to use two medically
 acceptable forms of contraception as described above, with one of the two forms being
 condom with spermicide, from the Screening Period through the follow up phone call
 after completion of study treatment. Males with female partners of childbearing
 potential who themselves are surgically sterile (status post vasectomy) must agree to
 use condoms with spermicide over the same period of time.

 EXCLUSION CRITERIA:

 -  Pregnant or lactating women

 -  Any clinically significant abnormalities on screening laboratories or physical
 examination as determined by the Investigator

 -  Abnormal 12-lead electrocardiogram (ECG) except minor deviations deemed to be of no
 clinical significance by the Investigator

 -  ALT or AST > 1.5 times the upper limit of normal (ULN) during screening

 -  Treated or untreated hypertension or blood pressure 140/90

 -  Treated or untreated diabetes diagnosed as fasting plasma glucose 126 or a HbA1c 6.5%

 -  TSH outside of the normal range

 -  Active or history of any significant medical condition such as and including renal,
 hepatic, pulmonary, gastrointestinal, cardiovascular, genitourinary, endocrine,
 immunologic, metabolic, neurologic or hematological disease.

 -  Clinical symptoms of or treatment for sleep apnea (severe snoring, excessive daytime
 somnolence)

 -  Any history of cancer, including personal history or close family history (parents or
 siblings) of melanoma; and/or personal history of multiple atypical nevi, nevoid basal
 cell carcinoma syndrome, or a personal history of non-melanoma skin cancer.

 -  Bariatric surgery

 -  History of recent surgery (within 60 days of screening)

 -  Current or recent (within last month) infection or viral illness

 -  Prescription drug use including topical steroids and inhalers, and non-prescription
 medicines with sympathomimetic actions (eg decongestants) if not stopped 1 week prior
 to and throughout the admission.

 -  Weight loss or gain of greater than 3% of body weight in last 3 months

 -  Inflexible dietary restrictions

 -  Actively training athletes (collegiate or professional level)

 -  Cigarette smoking (must be completely nonsmoking for at least 2 months)

 -  Dependence on caffeine, alcohol or drugs; unable or unwilling to abstain completely
 from caffeine and related substances for 72 hours prior to study and throughout the
 study

 -  Claustrophobia or other psychiatric conditions that would preclude participation in
 all aspects of the study

 -  Unable or unwilling to wear an insulin pump for the 6 days of treatment during the
 study (to deliver test drug and placebo)

 -  Participation in an investigational clinical study within the 30 days prior to dosing
 in the present study

 -  Any other reason, which in the opinion of the Investigator, would confound proper
 interpretation of the study