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Marcus MM, Marsh SA, Arriaga M, Negus SS, Banks ML. Effects of pharmacological and environmental manipulations on choice between fentanyl and shock avoidance/escape in male and female rats under mutually exclusive and non-exclusive choice conditions. Neuropsychopharmacology 2024:10.1038/s41386-024-01939-7. [PMID: 39103498 DOI: 10.1038/s41386-024-01939-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 07/16/2024] [Accepted: 07/17/2024] [Indexed: 08/07/2024]
Abstract
Substance use disorders are defined by persistent drug consumption despite adverse consequences. Accordingly, we developed two fentanyl-vs-shock avoidance/escape choice procedures in which male and female rats responded under a fixed-ratio (FR)1:FR1 concurrent schedule of shock avoidance/escape and IV fentanyl under either mutually exclusive or non-exclusive choice conditions. Initial experiments using a discrete-trial procedure determined behavioral allocation between mutually exclusive shock avoidance/escape and different fentanyl doses (0.32-18 μg/kg/infusion; Experiment 1). Shock intensity (0.1-0.7 mA) and shock avoidance/escape response requirement (FR1-16) were also manipulated (Experiment 2). Next, we used a free-operant procedure in which shock avoidance/escape and fentanyl were continuously available under non-exclusive conditions, and response-shock (R-S) interval (30-1000 s) was manipulated (Experiment 3). Finally, we tested the hypothesis that extended-access fentanyl self-administration would produce fentanyl dependence, establish fentanyl withdrawal as an endogenous negative reinforcer, and increase fentanyl choice in both procedures (Experiments 4 and 5). The shock avoidance/escape contingency decreased fentanyl self-administration, and rats consistently chose shock avoidance/escape over fentanyl in both choice conditions. Decreasing shock intensity or increasing shock avoidance/escape response requirement failed to increase fentanyl choice, suggesting that fentanyl and shock avoidance/escape are independent economic commodities. Increasing the R-S interval increased fentanyl choice but failed to increase shock delivery. Extended fentanyl access engendered high fentanyl intake and opioid withdrawal signs but failed to increase fentanyl choice under either choice condition. These results suggest that neither positive fentanyl reinforcement nor negative reinforcement by fentanyl withdrawal is sufficient to reduce shock avoidance/escape-maintained responding and increase foot shock as an adverse consequence.
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Affiliation(s)
- Madison M Marcus
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Samuel A Marsh
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Michelle Arriaga
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - S Stevens Negus
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA
| | - Matthew L Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, USA.
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Ingabire D, Qin C, Meng T, Raynold AAM, Sudarjat H, Townsend EA, Pangeni R, Poudel S, Arriaga M, Zhao L, Chow WN, Banks M, Xu Q. Nor-LAAM loaded PLGA microparticles for treating opioid use disorder. J Control Release 2024; 373:93-104. [PMID: 38968971 DOI: 10.1016/j.jconrel.2024.06.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 06/08/2024] [Accepted: 06/30/2024] [Indexed: 07/07/2024]
Abstract
The treatment landscape for opioid use disorder (OUD) faces challenges stemming from the limited efficacy of existing medications, poor adherence to prescribed regimens, and a heightened risk of fatal overdose post-treatment cessation. Therefore, there is a pressing need for innovative therapeutic strategies that enhance the effectiveness of interventions and the overall well-being of individuals with OUD. This study explored the therapeutic potential of nor-Levo-α-acetylmethadol (nor-LAAM) to treat OUD. We developed sustained release nor-LAAM-loaded poly (lactic-co-glycolic acid) (PLGA) microparticles (MP) using a hydrophobic ion pairing (HIP) approach. The nor-LAAM-MP prepared using HIP with pamoic acid had high drug loading and exhibited minimal initial burst release and sustained release. The nor-LAAM-MP was further optimized for desirable particle size, drug loading, and release kinetics. The lead nor-LAAM-MP (F4) had a relatively high drug loading (11 wt%) and an average diameter (19 μm) and maintained a sustained drug release for 4 weeks. A single subcutaneous injection of nor-LAAM-MP (F4) provided detectable nor-LAAM levels in rabbit plasma for at least 15 days. We further evaluated the therapeutic efficacy of nor-LAAM-MP (F4) in a well-established fentanyl-addiction rat model, and revealed a marked reduction in fentanyl choice and withdrawal symptoms in fentanyl-dependent rats. These findings provide insights into further developing long-acting nor-LAAM-MP for treating OUD. It has the potential to offer a new effective medication to the existing sparse armamentarium of products available to treat OUD.
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Affiliation(s)
- Diane Ingabire
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA; Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Chaolong Qin
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Tuo Meng
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | | | - Hadi Sudarjat
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - E Andrew Townsend
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Rudra Pangeni
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Sagun Poudel
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Michelle Arriaga
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Long Zhao
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Woon N Chow
- Department of Ophthalmology, Virginia Commonwealth University, Richmond, VA 23298, USA; Department of Pathology, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Matthew Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA.
| | - Qingguo Xu
- Department of Pharmaceutics, Virginia Commonwealth University, Richmond, VA 23298, USA; Department of Ophthalmology, Virginia Commonwealth University, Richmond, VA 23298, USA; Center for Pharmaceutical Engineering, and Institute for Structural Biology, Drug Discovery & Development (ISB3D), Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA.
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Ingabire D, Qin C, Meng T, Raynold AAM, Sudarjat H, Townsend EA, Pangeni R, Poudel S, Arriaga M, Zhao L, Chow WN, Banks M, Xu Q. Nor-LAAM loaded PLGA Microparticles for Treating Opioid Use Disorder. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.08.588574. [PMID: 38645066 PMCID: PMC11030377 DOI: 10.1101/2024.04.08.588574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
The treatment landscape for opioid use disorder (OUD) faces challenges stemming from the limited efficacy of existing medications, poor adherence to prescribed regimens, and a heightened risk of fatal overdose post-treatment cessation. Therefore, there is a pressing need for innovative therapeutic strategies that enhance the effectiveness of interventions and the overall well-being of individuals with OUD. This study explored the therapeutic potential of nor-Levo-α-acetylmethadol (nor-LAAM) to treat OUD. We developed sustained release nor-LAAM-loaded poly (lactic-co-glycolic acid) (PLGA) microparticles (MP) using a hydrophobic ion pairing (HIP) approach. The nor-LAAM-MP prepared using HIP with pamoic acid had high drug loading and exhibited minimal initial burst release and sustained release. The nor-LAAM-MP was further optimized for desirable particle size, drug loading, and release kinetics. The lead nor-LAAM-MP (F4) had a relatively high drug loading (11 wt.%) and an average diameter (19 µm) and maintained a sustained drug release for 4 weeks. A single subcutaneous injection of nor-LAAM-MP (F4) provided detectable nor-LAAM levels in rabbit plasma for at least 15 days. We further evaluated the therapeutic efficacy of nor-LAAM-MP (F4) in a well-established fentanyl-addiction rat model, and revealed a marked reduction in fentanyl choice and withdrawal symptoms in fentanyl-dependent rats. These findings provide insights into further developing long-acting nor-LAAM-MP for treating OUD. It has the potential to offer a new effective medication to the existing sparse armamentarium of products available to treat OUD.
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Beasley MM, Amantini S, Gunawan T, Silberberg A, Kearns DN. Cocaine and heroin interact differently with nondrug reinforcers in a choice situation. Exp Clin Psychopharmacol 2024; 32:158-172. [PMID: 37535523 PMCID: PMC10837314 DOI: 10.1037/pha0000674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
The present study used a rat choice model to test how cocaine or heroin economically interacted with two different nondrug reinforcers along the substitute-to-complement continuum. In Experiment 1, the nondrug alternative was the negative reinforcer timeout-from-avoidance (TOA)-that is, rats could press a lever to obtain a period of safety from footshock. One group of rats chose between cocaine and TOA and another group chose between heroin and TOA. The relative prices of the reinforcers were manipulated across phases while controlling for potential income effects. When cocaine was the reinforcer, rats reacted to price changes by increasing their allocation of behavior to the more expensive option, thereby maintaining relatively proportional intake of cocaine and TOA reinforcers across prices, suggesting these reinforcers were complements here. In contrast, when heroin became relatively cheap, rats increased allocation of income to heroin and decreased allocation of income to TOA, suggesting that heroin substituted for safety. Additionally, rats were willing to accept more footshocks when heroin was easily available. In Experiment 2, the nondrug alternative was saccharin, a positive reinforcer. Heroin and saccharin were complements, but there was no consistent effect of price changes on the allocation of behavior between cocaine and saccharin. As a model of the processes that could be involved in human drug use, these results show that drug-taking behavior depends on the type of drug, the type of nondrug alternative available, and the prices of both. (PsycInfo Database Record (c) 2024 APA, all rights reserved).
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Affiliation(s)
| | - Sarah Amantini
- Psychology Department, American University, Washington, DC
| | - Tommy Gunawan
- Human Psychopharmacology Laboratory, NIAAA/NIH, Bethesda, MD
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Abstract
This paper is the forty-fifth consecutive installment of the annual anthological review of research concerning the endogenous opioid system, summarizing articles published during 2022 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides and receptors as well as effects of opioid/opiate agonists and antagonists. The review is subdivided into the following specific topics: molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors (1), the roles of these opioid peptides and receptors in pain and analgesia in animals (2) and humans (3), opioid-sensitive and opioid-insensitive effects of nonopioid analgesics (4), opioid peptide and receptor involvement in tolerance and dependence (5), stress and social status (6), learning and memory (7), eating and drinking (8), drug abuse and alcohol (9), sexual activity and hormones, pregnancy, development and endocrinology (10), mental illness and mood (11), seizures and neurologic disorders (12), electrical-related activity and neurophysiology (13), general activity and locomotion (14), gastrointestinal, renal and hepatic functions (15), cardiovascular responses (16), respiration and thermoregulation (17), and immunological responses (18).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, USA.
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Ye L, Li C, Jiang W, Yang Y, Wang W, Zhu H, Hu Z, Li N, Cen X, Wang H, Tian J. Subacute toxicity evaluations of LPM3480392 in rats, a full µ-opioid receptor biased agonist. Front Pharmacol 2023; 14:1218380. [PMID: 37601058 PMCID: PMC10436550 DOI: 10.3389/fphar.2023.1218380] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Accepted: 07/20/2023] [Indexed: 08/22/2023] Open
Abstract
Opiates produce analgesia via G-protein signaling, and adverse effects, such as respiratory depression and decreased bowel motility, by β-arrestin pathway. Oliceridine, a G protein-biased MOR agonist, only presents modest safety advantages as compared to other opiates in clinical trials, possibly due to its limited bias. Our previous study shown that LPM3480392, a full MOR biased agonist, is selective for the Gi pathway over the β-arrestin-2. In the present article, we evaluated the subacute toxicity of LPM3480392 in rats. The rats were administered with control article or LPM3480392 0.6, 1.2 or 2.4 mg/kg/day for 4 consecutive weeks followed by a 4-week recovery phase. Intravenous infusion was conducted at tail vein at 0.2, 0.4 or 0.8 mg/kg/day with a dosing volume of 10 mL/kg and 5 min/rat/dose, three times a day with an interval of approximately 4 h. The concomitant toxicokinetics study was conducted. Two unscheduled rats at 2.4 mg/kg/day died with no clear cause. For the scheduled necropsy, the major effects were associated with the MOR agonist-related pharmacodynamic properties of LPM3480392 (e.g., increased activity, increased muscle tone; decreased food consumption and body weight gain; and clinical chemistry changes related with decreased food consumption) in three LPM3480392 groups. In addition, LPM3480392 at 2.4 mg/kg/day also induced deep respiration and histopathology changes in testis and epididymis in sporadic individual rats. However, different from other opiates, LPM3480392 presents weak/no immunosuppression and the decreased adrenal gland weight, which may be due to LPM3480392' full MOR bias. At the end of recovery phase, all findings were recovered to some extent or completely. In the toxicokinetics study, the dose-dependent elevation of drug exposure was observed, which partly explained the toxicity of high dose. In summary, LPM3480392 has exhibited good safety characteristics in this subacute toxicity study in rats.
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Affiliation(s)
- Liang Ye
- School of Public Health and Management, Binzhou Medical University, Yantai, Shandong, China
| | - Chunmei Li
- Key Laboratory of Molecular Pharmacology and Drug Evaluation, School of Pharmacy, Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, Shandong, China
| | - Wanglin Jiang
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Yifei Yang
- Key Laboratory of Molecular Pharmacology and Drug Evaluation, School of Pharmacy, Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, Shandong, China
| | - Wenyan Wang
- Key Laboratory of Molecular Pharmacology and Drug Evaluation, School of Pharmacy, Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, Shandong, China
| | - Haibo Zhu
- School of Public Health and Management, Binzhou Medical University, Yantai, Shandong, China
| | - Zhengping Hu
- Medicine and Pharmacy Research Center, Binzhou Medical University, Yantai, Shandong, China
| | - Ning Li
- School of Public Health and Management, Binzhou Medical University, Yantai, Shandong, China
| | - Xiaobo Cen
- WestChina-Frontier PharmaTech Co., Ltd., Chengdu, Sichuan, China
| | - Hongbo Wang
- Key Laboratory of Molecular Pharmacology and Drug Evaluation, School of Pharmacy, Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, Shandong, China
| | - Jingwei Tian
- Key Laboratory of Molecular Pharmacology and Drug Evaluation, School of Pharmacy, Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, Shandong, China
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Ventriglia E, Rizzo A, Gomez JL, Friedman J, Lam S, Solís O, Rais R, Bonaventura J, Michaelides M. Essential role of P-glycoprotein in the mechanism of action of oliceridine. Neuropsychopharmacology 2023; 48:831-842. [PMID: 36434081 PMCID: PMC10066384 DOI: 10.1038/s41386-022-01507-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/26/2022] [Accepted: 11/07/2022] [Indexed: 11/27/2022]
Abstract
Mu opioid receptor (MOR) agonists comprise the most effective analgesics, but their therapeutic utility is limited by adverse effects. One approach for limiting such effects has been to develop "biased" MOR agonists that show preference for activating G protein over β-Arrestin signaling. However, the notion of biased agonism has been challenged by recent studies. Oliceridine (Olinvyk®, TRV-130, OLC) is a selective MOR agonist approved by the FDA in 2020 for pain management in controlled clinical settings. Oliceridine purportedly demonstrates diminished adverse effects compared to morphine or other MOR agonists, a profile attributed to its biased agonism. However, recent studies suggest that oliceridine does not display biased agonism but instead weak intrinsic efficacy for G protein and β-Arrestin activation. Nevertheless, these insights have been derived from in vitro studies. To better understand oliceridine's in vivo efficacy profile, we performed a comprehensive assessment of its in vitro and in vivo pharmacology using both cultured cells and rodents. In vitro, oliceridine displayed high MOR affinity and weak intrinsic efficacy. In vivo, oliceridine showed impaired brain penetrance and rapid clearance, effects we attributed to its interaction with the P-glycoprotein (P-gp) efflux transporter. Moreover, we found that P-gp was essential for oliceridine's in vivo efficacy and adverse effect profiles. Taken together with prior studies, our results suggest that oliceridine's in vivo efficacy and adverse effect profiles are not attributed solely to its weak intrinsic efficacy or biased agonism but, to a large extent, its interaction with P-gp as well.
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Affiliation(s)
- Emilya Ventriglia
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA
| | - Arianna Rizzo
- Departament de Patologia i Terapèutica Experimental, Institute de Neurociències, Universitat de Barcelona, L'Hospitalet de Llobregat, Catalonia, Spain
- Neuropharmacology & Pain Group, Neuroscience Program, Bellvitge Institute for Biomedical Research (IDIBELL), L'Hospitalet de Llobregat, Catalonia, Spain
| | - Juan L Gomez
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA
| | - Jacob Friedman
- Medications Development Program, Molecular Targets and Medication Discovery Branch, National Institute on Drug Abuse, Baltimore, MD, 21224, USA
- Johns Hopkins Drug Discovery, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
| | - Sherry Lam
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA
| | - Oscar Solís
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA
| | - Rana Rais
- Johns Hopkins Drug Discovery, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
- Department of Pharmacology, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
| | - Jordi Bonaventura
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA.
- Departament de Patologia i Terapèutica Experimental, Institute de Neurociències, Universitat de Barcelona, L'Hospitalet de Llobregat, Catalonia, Spain.
- Neuropharmacology & Pain Group, Neuroscience Program, Bellvitge Institute for Biomedical Research (IDIBELL), L'Hospitalet de Llobregat, Catalonia, Spain.
| | - Michael Michaelides
- Biobehavioral Imaging and Molecular Neuropsychopharmacology Unit, National Institute on Drug Abuse, Baltimore, MD, 21224, USA.
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA.
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Amirali AS, Hecker JC, Figueroa HM, Effinger DP, Montoro RA, Jedema HP, Vogt CD, Newman AH, Schindler CW, Bradberry CW. Effects of buprenorphine, methadone, and cariprazine on economic choice between remifentanil and food in squirrel monkeys. ADDICTION NEUROSCIENCE 2023; 5:100065. [PMID: 36873095 PMCID: PMC9979865 DOI: 10.1016/j.addicn.2023.100065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
We recently reported an economic choice task in which squirrel monkeys chose between differing amounts of remifentanil, a fast-acting opioid, or a food reward to develop a preclinical screen for evaluating potential pharmacotherapies for opioid dependence. Herein, two known opioid addiction treatments are evaluated using this task, as well as a potential new agent, cariprazine, a dopamine D2/D3 receptor partial agonist currently used to treat bipolar disorder and schizophrenia. Preclinical rodent studies suggest this class of compounds may reduce opiate self-administration. Squirrel monkeys were pretreated daily with clinically relevant doses of each compound during the five days of treatment evaluation using the economic choice task. Shifts in drug preference were measured as changes in subjects' indifference values, where the probability of drug and milk choice are equivalent. Buprenorphine produced a significant shift in indifference value between baseline and treatment weeks, indicating a decrease in drug preference. Subjects treated with methadone and cariprazine did not show any significant shift in drug preference. Differences between the buprenorphine and methadone results likely reflect a lack of opioid dependence in the subjects. The cariprazine results suggest that it does not alter opioid reward in non-dependent primates over a five day period.
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Affiliation(s)
- Alishan S. Amirali
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Jacquelin C. Hecker
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Hector M. Figueroa
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Devin P. Effinger
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
- Department of Pharmacology, University of North Carolina Chapel Hill, Chapel Hill, NC
| | - Rodrigo A. Montoro
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
- Medical Scientist Training Program (MTSP) at UW-Madison, Madison, WI
| | - Hank P. Jedema
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Caleb D. Vogt
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Amy Hauck Newman
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Charles W. Schindler
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
| | - Charles W. Bradberry
- Behavioral Neuroscience Branch, National Institute on Drug Abuse, Intramural research Program, Baltimore, MD, USA
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