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4 protocols using hs014

1

Rodent Alcohol and Food Consumption Study

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Bupropion hydrochloride and naltrexone-hydrochloride (Sigma Aldrich, USA) or HS014 (Tocris, USA) were dissolved in 0.9% saline and administered within a range of doses known to affect alcohol drinking or food consumption in rodents [Greenway et al., 2009 (link); Zhou et al., 2017a (link); Levy et al., 2018 (link)]. The BPP+NTX combination was studied at a ratio of 10 BPP/1 NTX in most experiments to model the ratio employed in Contrave® [Greenway et al., 2009 (link)]. The alcohol solution from 190 proof absolute ethyl alcohol (Pharmco-AAPER, Brookfield, CT), sucrose or saccharin [Sigma-Aldrich Inc., St. Louis, MO, USA) was diluted in tap water.
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2

Intra-VTA drug infusion protocol for behavioral testing

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αMSH (Tocris, UK), HS014 (Tocris, UK), D-trp8-γMSH (γMSH; Tocris, UK,), AGRP (83–132)-amide (Phoenix Pharmaceuticals, USA), and α-flupenthixol dihydrochloride (Sigma Aldrich, USA) were dissolved in sterile saline. 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX, Tocris, UK), DL-2-Aminophosphonopentanoic acid (APV, Tocris, UK), and bicuculline (Tocris, UK) were prepared as a stock solution.
For i.c.v. infusions, rats were briefly restrained and 2 μl of drug solution was injected over 10 s into the ventricular cavity. Intra-VTA infusions were performed through an injector (9 mm, 33GA, Plastics One, USA) inserted into the guide cannula. Bilateral infusions (300 nl over 30 s) were made using a syringe pump with the injectors left in place for another 30 s to allow for diffusion. α-Flupenthixol dihydrochloride was injected intraperitoneally (i.p.) 30 min before intra-VTA infusions. All animals received all drug doses/combinations, according to a Latin-square design. Behavioral testing commenced 5 min after drug infusions and a minimum 1 day drug-free period was maintained between infusions during which the animals were trained but not tested.
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3

Detailed Compound Solubilization and Storage

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BIBO3304 and BIIE0246 (Tocris Bioscience) were dissolved in 10% DMSO (at 1 mM) and stored at −20°C. Peptide stocks of LY211688 (Bachem Laboratories), α-MSH (Abcam), HS014 (Tocris Bioscience), NDP-α-MSH, ACTH and MT II (Phoenix Pharmaceuticals), VIP and PYY (Cambridge Bioscience) were dissolved in water, and aliquots stored at −20°C. PSN632408 (Cayman Chemical) was dissolved in 95% ethanol. All other compounds were of analytical grade (Sigma-Aldrich).
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4

Melanocortin Receptor Agonist Assay

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Nle(4),D-Phe(7)]α-melanocyte-stimulating hormone (NDP-α-MSH) was from Phoenix Pharmaceuticals, Inc. (Cat. no. 043-06, Burlingame, CA, USA). HS014 was from Tocris (Cat. no. 1831, Abingdon, UK). Human α-MSH, D-glucose and bombesin were from Sigma Aldrich (Cat. no. M4135, G8270 and B4272, Brøndby, Denmark).
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