a novel compound for alcoholism treatment: a translational strategy - part ii

Conditions: Alcoholism

Summary: background: hormones are naturally occurring chemicals in the body. ghrelin is a hormone that stimulates appetite. it may also stimulate alcohol cravings and use. researchers want to learn more about alcohol cravings and test if a drug that blocks ghrelin lowers alcohol cravings. objective: to test if the drug pf-05190457 decreases alcohol craving. eligibility: people ages 18-70 who have: alcohol use disorder no other serious medical problems woman must be postmenopausal or have had surgery to prevent pregnancy. design: participants will stay on the inpatient unit here at the clinical center for two 2-week stages, which will be separated by at least 2 days. the inpatient phase include: taking the study drug or placebo by mouth twice daily blood tests tasting several sweet solutions physical exams exposure to alcohol, water, and food cues in a bar-like room. participants answer questions on a computer. blood pressure and heart rate are monitored through an arm cuff and sensors on the chest. mris: participants lie on a table that slides in and out of the cylinder, and a coil is placed over the head. they complete tasks on a computer screen while in the cylinder. this lasts up to 2 hours. wearing a virtual reality headset, walking around a virtual room, and selecting virtual food and drink. physical exams

objective: ghrelin is a 28-amino acid peptide that stimulates appetite and food intake. it is an endogenous ligand for the growth hormone secretagogue receptor (ghsr1a). preclinical studies suggest that ghrelin modulates alcohol reward processing. previous work from our research team, indicated that intravenous (iv) ghrelin administration, compared to placebo, results in an acute increase in alcohol craving during a cue-reactivity experiment in alcoholic individuals. therefore, an oral bioavailable, ghrelin receptor antagonist that is able to pass through the blood brain barrier holds particular promise as a treatment for alcohol use disorder (aud). this protocol is part of a grant project funded by national center for advancing translational sciences (ncats) aimed to generate preliminary evidence in aud on the safety and efficacy of a ghrelin receptor (ghsr1a) antagonist, pf-05190457, an existing molecule available under the nih-industry pilot program at ncats. completed preclinical and clinical (protocol #14-aa-0042) work has demonstrated the safety of pf-05190457/alcohol interaction. the goal of this protocol is to conduct a proof-of-concept human laboratory study to assess an early-signal of efficacy of pf-05190457 in aud. study population: the study population will be aud individuals (n = 55). study design: a within-subject, counterbalanced, double-blind, placebo-controlled study. outcome measures: the primary aim will be to determine whether pf-05190457, compared to placebo, reduces alcohol cue-elicited craving. as another outcome will be to determine whether pf-05190457, compared to placebo, reduces brain blood oxygen level dependent (bold) response during exposure to alcohol cues, during a task-based fmri scan. we will also investigate the effects of pf-05190457 on food craving as well as on food choices using a virtual buffet experimental procedure. all these outcomes will be assessed in the inpatient unit at the nih clinical center (cc). after the inpatient portion of the protocol, patients will be followed-up as outpatients. during the outpatient phase, patients will be offered motivational interviewing and video feedback to explore the effects of this intervention, compared to supportive counseling, on maintaining motivation for alcohol abstinence and inform future studies where medications like pf-05190457 and behavioral treatments may be combined. the outpatient phase is optional for treatment seeking and nontreatment seeking participants.

Eligibility criteria:
* inclusion criteria: * male or female individuals 18-70 years old (inclusive) * current alcohol use disorder (aud) by dsm-5 criteria based on the scid * most recent urine drug test for illegal drugs of abuse is negative * most recent clinical institute withdrawal assessment for alcohol - revised (ciwa-ar) score is less than or equal to 8 * heart rate less than or equal to 100 on two separate measurements, both assessed after ciwa-ar score is less than or equal to 8 * female subjects must be of non childbearing potential as defined by at least one of the following criteria: a) females 45-70 years old, who are menopausal, defined as follow: i) females who are between 45-55 years old: they will be considered menopausal if they satisfy all the following three requirements during screening: 1) they are in amenorrhea, defined as absence of menstruation for the previous 12 months; 2) they have a negative urine pregnancy test; and 3) they have a serum fsh level within the laboratory s reference range for postmenopausal females. ii) females who are between 56-70 years old: they will be considered menopausal if they are in amenorrhea, defined as absence of menstruation for the previous 12 months before screening. or b) females 21-70 years old, who have a documented hysterectomy and/or bilateral oophorectomy. all other female subjects (including females with tubal ligations and females that do not have a documented hysterectomy) will be considered to be of childbearing potential. * male subjects must use one of the following methods of contraception from the first dose of study medication and until 28 days after dosing (given that it is unknown whether the effects of this drug can cause birth defects): 1. abstinence. 2. a condom and one of the following: * vasectomy for more than 6 months. * female partner who meets one of the following conditions: 1. has had a tubal ligation, hysterectomy, or bilateral oophorectomy; 2. is post menopausal; 3. uses one of the following forms of contraception: copper or hormonal containing iud; spermicidal foam/gel/film/cream/suppository; diaphragm with spermicide; oral contraceptive; injectable progesterone; subdermal implant. exclusion criteria: * lifetime clinical diagnosis of schizophrenia or bipolar disorder * ekg with qtc \> 450 msec as determined by the fridericia formulas. * bmi less than or equal to 18.5 kg/m(2) or anorexia * bmi greater than or equal to 40 kg/m(2) * history of epilepsy and/or seizures note: individuals who have a history of alcohol withdrawal seizures may be in the study as long as they have been abstinent from alcohol for at least 2 weeks prior to consent and during that period of abstinence, there were no seizure episodes (otherwise, participant remains not eligible). * most recent blood tests show creatinine greater than or equal to 2 mg/dl, ast or alt \> 3 times the upper normal limit, hemoglobin \<10.5 g/dl * subjects who have diabetes and/or are treated with any drug with glucose lowering properties such as sulfonylurea, insulin, metformin, thiazolidinediones (tzd), dipeptidyl peptidase-4 (dpp4) inhibitors, or glucagon-like peptide-1(glp-1)agonists (due to the glucose-lowering properties of pf-05190457 observed in healthy volunteers) * exclusionary medications: * a. naltrexone, acamprosate, alcohol dehydrogenase inhibitors, topiramate, gabapentin, ondansetron, benzodiazepines, baclofen, drugs that are known to prolong the qtc interval and barbiturates as well as hormone replacement therapy; medications and dietary/herbal supplements (like st. john's wort) that interact with cytochrome p450 3a4. patients who take these medications may be enrolled in the study only if the potentially interacting medication has been stopped for a period of at least 5 half-lives of the interacting medication before pf-05190457 administration. patients who take these medications on an as needed (prn) schedule or take the medication as a one-time dose as part of a medical procedure or a diagnostic test, for example, may not have to wait the 5 half-lives period of time before enrollment; this will be evaluated on a case by case basis by the mai and/or pi, based on the specific pharmacological properties of the medication. * unable to pass a finger rub hearing test * vision is unable to be corrected to (snellen) 20/100 * clinically-significant history of motion or car sickness, or history of vestibular disorders * any other reason or clinical condition for which the pi or the mai will consider unsafe for a possible participant to participate in this study exclusion criteria for fmri only: * have contraindications for brain fmri, as determined by the niaaa mri safety screening form (conducted under the 14-aa-0181 screening protocol) * colorblindness (this would prevent subject from completing the stroop task) using the ishihara test for color deficiency, concise edition, 2014.

Keywords: alcohol consumption alcohol treatment alcoholism ghrelin ghrelin antagonism