Brain Dopaminergic Signaling in Opioid Use Disorders

Eligibility Criteria

• 1. Males or females between 18 and 80 years of age.
• 2. Ability to provide written informed consent.
• 1. Males or females between 18 and 80 years of age.
• 2. Ability to provide written informed consent.
• 3. DSM-5 diagnosis of a moderate or severe OUD (established through history and clinical exam).
• 4. Minimum of 3 months since last regular use of opioids (no more than 1x/week in the past 3 months as assessed by self-report).
• 5. Minimum 3 year history of past opiate abuse - self-report.
• 6. Must have consumed opiates at least 5 days per week (past opioid use) as per self-report.
• 7. Currently not receiving medications for OUD and a minimum of 3 months since last regularly taking medications for OUD (methadone, buprenorphine or naltrexone) as per self-report.
• 1. Males or females between 18 and 80 years of age.
• 2. Ability to provide written informed consent.
• 3. DSM-5 diagnosis of a moderate or severe OUD (established through history and clinical exam).
• 4. Active or non-active abuse of opiates.
• 5. Minimum 3 year history of opiate abuse as per self-report.
• 6. Must have consumed at least 5 days per week (prior opiate use) as per self-report.
• 7. Receiving opioid agonist therapy for OUD (e.g., methadone or buprenorphine) and must have taken for at least one week before imaging study
• 1. Males or females between 18 and 80 years of age.
• 2. Ability to provide written informed consent.
• 3. DSM-5 diagnosis of a moderate or severe OUD (established through history and clinical exam).
• 4. Active or non-active abuse of opiates.
• 5. Minimum 3 year history of opiate abuse as per self-report.
• 6. Must have consumed at least 5 days per week (prior opiate use) as per self-report.
• 7. Receiving naltrexone treatment for their OUD and must have taken at least one week before imaging study.
• * 1: OUD and HV subjects who are age 66-80 may be included in this study except they will not receive the methylphenidate and subsequent PET/\[11C\]raclopride and MRI scans. They will receive the placebo (Phase D) and subsequent PET/\[11C\]raclopride and MRI scans.
• * 2: Source documentation for the subject s ability to provide written informed consent will be a note in CRIS documenting that the subject is alert and oriented to person, place, and time; and/or an unremarkable neurological examination; dated on or before the date of consent.
• 1. Current DSM-5 diagnosis of a psychiatric disorder (other than nicotine/caffeine use) that requires/required daily psychoactive medications (antidepressant, antipsychotics, stimulants, benzodiazepines or barbiturates) in the past two months and that could impact brain function at the time of the study as determined by history and clinical exam.
• 2. The following current chronically used (2 months) medications are exclusionary: stimulant or stimulant-like medications (amphetamine, methylphenidate, modafinil); opioid analgesics; antianginal agents; antiarrhythmics; systemic corticosteroids; anticholinergics; anticoagulants; anticonvulsants; antidepressants; antihistamines (sedating); beta-blocker antihypertensives; antineoplastics; antiobesity; antipsychotics; anxiolytics (benzodiazepine or barbiturates); lithium; muscle relaxants; psychotropic drugs not otherwise specified (nos); sedatives/hypnotics, systemic steroids. Note that nicotine and/or caffeine is not exclusionary. Subjects on stable antihypertensive medications (except for beta blockers) may be included provided they are on a clinically stable dose for at least a month \[BP must be less than or equal to 140/90 if participating in MP or placebo administration scans (Phases A \&B); or BP must be less than or equal to 160/100 if participating in placebo administration scan (Phase D)\].
• 3. Current continuous treatment (\> 3 weeks) with methadone, buprenorphine or naltrexone.
• 4. Current major medical problems that can permanently impact brain function (e.g., CNS: including seizures, psychosis, stroke, severe depression, Alzheimer s, Parkinson s disease, Traumatic brain injury; Cardiovascular: including uncontrolled hypertension \[BP \> 140/90\] and clinically significant EKG results except bradycardia; and HIV+) as determined by history.
• 5. Clinically significant laboratory findings that could impact brain function or study procedures (e.g., active infections, significant EKG results, hepatic or renal failure) will be exclusionary.
• 6. Have had previous radiation exposure (from X-rays, PET scans, or other exposure) that, with the exposure from this study, would exceed NIH annual research limits as determined by medical history and physical exam.
• 7. Head trauma with loss of consciousness for more than 30 minutes as determined by medical history and physical exam.
• 8. Pregnant and/or currently breast-feeding. Females of childbearing potential (age 60 or less) will undergo a urine pregnancy test that must be negative to participate. Urine pregnancy tests will be repeated on subsequent days of study.
• 9. Presence of ferromagnetic objects in the body that are contraindicated for MRI (pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces - self-report checklist.
• 10. Personal or family history (parents or siblings) for cerebral aneurysm.
• 11. Past or present history of chest pain and trouble breathing with activity.
• 12. Glaucoma as assessed by medical history.
• 13. Cannot lie comfortably flat on their backs for up to 2 hours in the PET and MRI scanners self-report.
• 14. Weight \> 400 pounds, which is the maximum weight the PET scanner can hold.
• 15. Study investigators and staff, as well as their superiors, subordinates and immediate family members (adult children, spouses, parents, siblings).
• 16. \*Non-English speakers (must also be able to read and comprehend English).
• 1. DSM-5 diagnosis of a psychiatric disorder that requires daily use of antipsychotic medications (schizophrenia or any other psychotic disorder) at the time of the study as determined by history and clinical exam.
• 2. Currently on antipsychotic medications. Subjects on stable antihypertensive medications may be included provided they are clinically stable \[BP must be less than or equal to 140/90 if participating in MP administration scan (Phases A \& B); or BP must be less than or equal to 160/100 if participating in placebo administration scan (Phase D). OUD subjects who are taking a stimulant medication may participate in the study, except that they will be asked to not take their prescribed stimulant medication on the days of the \[11C\]raclopride scans.
• 3. Current continuous treatment (\> 3 weeks) with methadone or buprenorphine for MAT- OUD participants; or naltrexone for MAT+ OUD participants; or agonist treatment (methadone or buprenorphine) for OUD participants treated with Naltrexone.
• 4. Current major medical problems that can permanently impact brain function (e.g., CNS: including seizures, psychosis, stroke, severe depression, Alzheimer s, Parkinson s disease, Traumatic brain injury; Cardiovascular: including uncontrolled hypertension \[BP \> 140/90 excludes from participating in MP administration scan (Phases A \& B); or BP \> 160/100 excludes from participating in placebo administration scan (Phase D)\] and clinically significant EKG results except bradycardia; and HIV+) as determined by history. However, OUD subjects who have hypertension and/or certain non-significant EKG results may still be included in this study except they will not receive the methylphenidate and subsequent PET/RAC and/or MRI scans, but will receive the placebo and subsequent PET/RAC and/or MRI scans as long as their BP's are less than or equal to 160/100 based on BP's obtained during initial H\&P.
• 5. Clinically significant laboratory findings that could impact brain function or study procedures (e.g., active infections, significant EKG results, hepatic or renal failure) will be exclusionary.
• 6. Have had previous radiation exposure (from X-rays, PET scans, or other exposure) that, with the exposure from this study, would exceed NIH annual research limits as determined by medical history and physical exam.
• 7. Head trauma with loss of consciousness for more than 30 minutes as determined by medical history and physical exam.
• 8. Pregnant and/or currently breast-feeding. Females of childbearing potential (age 60 or less) will undergo a urine pregnancy test that must be negative to participate. Urine pregnancy tests will be repeated on subsequent days of study.
• 9. Presence of ferromagnetic objects in the body that are contraindicated for MRI (pacemakers or other implanted electrical devices, brain stimulators, some types of dental implants, aneurysm clips, metallic prostheses, permanent eyeliner, implanted delivery pump, or shrapnel fragments) or fear of enclosed spaces - self-report checklist. However, OUD subjects who are contraindicated for MRI participation, or the study team cannot access prior surgical records to confirm that a subject is cleared for MRI, may still participate in all aspects of the study except MRI. If it is discovered during the clinical brain MRI or after enrollment onto the study that the subject experiences anxiety or becomes claustrophobic, we will discontinue the MRI portion of the study and he/she can continue to participate in all other aspects of the study.
• 10. Personal or family history (parents or siblings) for cerebral aneurysm. Participant may be included in the PL administration with PET/RAC and/or MR but is excluded from the MP administration and subsequent PET/RAC and/or MR scan if history is reported.
• 11. Past or present history of chest pain and trouble breathing with activity. Participant may be included in the PL administration with PET/RAC and/or MR but is excluded from MP administration and subsequent PET/RAC and/or MR scan if history is reported.
• 12. Glaucoma as assessed by medical history. Participant may be included in the PL administration with PET/RAC and/or MR but is excluded from MP administration and subsequent PET/RAC and/or MR scan if history of glaucoma reported.
• 13. Cannot lie comfortably flat on their backs for up to 2 hours in the PET and MRI scanners self-report.
• 14. Weight \> 400 pounds, which is the maximum weight the PET scanner can hold.
• 15. Study investigators and staff, as well as their superiors, subordinates and immediate family members (adult children, spouses, parents, siblings).
• 16. \*Non-English speakers (must also be able to read and comprehend English).
• 17. Participation in a court ordered residential treatment program.