1. Levine AS, Billington CJ. Why do we eat? A neural systems approach. Annu Rev Nutr 1997; 17:597–619.
2. Morley JE, Levine AS, Yim GK, Lowy MT. Opioid modulation of appetite. Neurosci Biobehav Rev 1983; 7: 281-305.
3. Glass MJ, Billington CJ, Levine AS. Naltroxone administered to central nucleus of amygdala or PVN: neural dissociation of diet and energy. Am J Physio Regul Integr Comp Physiol 2000; 279: 86-92.
4. Nencini P, Stewart J. Chronic systemic administration of amphetamine increases food intake to morphine, but not to U50-488H, microinjected into the ventral tegmental area in rats, Brain Res 1990; 527: 254-8.
5. Soderpalm AH, Berridge KC. Food intake after diazepam, morphine or muscimol: microinjections in the nucleus accumbens shell. Pharmacol Biochem Behav 2000; 66: 429-34
6.Konecka AM, Sadowski B, Jaszczak J, Panocka I, Sroczynska I. Suppression of food and water intake after intracerebroventricular infusion of morphine and naloxone in rabbits. Arch Int Physiol Biochim 1984; 92: 219-26.
7.Spencer RL, Deupree D, Hsiao S, Mosberg HI, Hruby V, Burks TF, Porreca F. Centrally-administered opioid selective agonists inhibit drinking in the rat. Pharmacol Biochem Behav 1986; 25(1):77-82.
8.Eidi M, Oryan S, Eidi A, Sepehrara L. Effect of morphine, naloxone and histamine system on water intake in adult male rats. Eur J Pharmacol 2003; 478: 105-110.
9.Marrazzi MA, McQuarters A, Barnes C, Lawhorn JD, Amico-Rasmussen Q. Male/female comparison of morphine effect on food intake-relation to anorexia nervosa. Pharmacol Biochem Behav 1996; 53(2): 433-5.
10. Hodge CW, Niehus JS, Samson HH. Morphine induced changes in ethanol-and water-intake are attenuated by the 5-HT3/4 antagonist tropisetron. Psychopharmacol 1995; 119: 186-92.
11. Vacca G, Serra S, Brubetti G, Carai MAM, Gessa GL, Colombo G. Boosting effect of morphine on alcohol drinking is suppressed not only by the cannabinoid CB1 receptor antagonist, SR 141716. Eur J Pharmacol 2002; 445: 55-59.
12.Alaei H, Hosseini M. Angiotensin converting enzyme inhibitor captopril modifies conditioned place preference induced by morphine and morphine withdrawal signs in rats. Pathophysiol 2007; 14: 55-60.
13. Cooper SJ, Jackson A, Kirkham TC, Turkish S. Endorphins, opiates and food intake. In: Rodgers RJ, Cooper SJ. (eds). Endorphins, Opiates and Behavioral Processes. New York :Wiley;1988.143-186.
14.Morley JE, Levine AS,Grace M,Kneip J,Zeugner H. The effect of the opioid-benzodiazepine, tifluadom, on ingestive behaviors. Eur J Pharmacol 1983; 93(3-4): 265-9.
15.Yu WZ, Bodnar RJ. Interactions between angiotensin II and delta opioid receptor subtype agonists upon water intake in rats. Peptides 1997; 18(2): 241-5.
16. Alaei H, Esmaeili M, Nasimi A, Pourshanazari A. Ascorbic acid decreases morphine self-administration and withdrawal symptoms in rats. Pathophysiol 2005; 12: 103-107.
17. Zetier G, Raberg A.Ceruletide inhibits water intake in deprived mice: comparison with morphine and enkephalin analogue, FK 33-824. Eur J pharmacol 1985; 114(3): 248-51.
18. Bodnar RJ, Hadjimarkou MM, Krzanowska EK, Silva RM, Stein JA. Differential dose-dependent effects of central morphine treatment upon food intake in male and female rats receiving neonatal hormone manipulations. Nutr Neurosci 2003; 6(1): 53-7.
19.Cole JL, Berman N, Bodnar RJ. Evaluation of chronic opioid receptor antagonist effects upon weight and intake measures in lean and obese Zucker rats. Peptides1997; 18: 1201-1207.
20.Gosnell BA, Levine AS. Stimulation of ingestive behavior by preferential and selective opioid agonists. In: Cooper SJ, Clifton PG. (eds). Drug receptor subtypes and ingestive behavior. London: Academic Press Ltd; 1996. 147-166.
21.Marin CL, Olster DH. Opioid receptor blockade promotes weight loss and improves the display of sexual behaviors in obese Zuker female rats. Pharmacol Biochem Behav 1999; 63(3): 515-520.
22.Jarosz PA. The effect of kappa opioid receptor antagonism on energy expenditure in the obese Zucker rat. Biol Res Nurs 2007; 8(4): 294-9.
23.Finley JCW, Maderdrut JL, Petrusz P. The immunocytochemical localization of enkephalin in the central nervous system of the rat. J Comp Neural 1981; 198: 541-565.
24.Khachaturian H, Lewis ME, Tsou K, Watson SJ. Beta endorphine, alpha MSN, ACTH and related peptides. In: Bjorklund A, Hokfelt T. (eds). Handbook of chemical neuroanatomy, Vol 4: GABA and neuropeptides in the CNS, part 1. Amsterdam: Elsevier; 1985. 216-272.
25. Mansour A,Khachaturian H, Lewis ME, Akil H,Watson SJ. Autoradiographic differentiation of mu, delta, and kappa opioid receptors in the rat forbrain and midbrain. J Neurosci1987; 7: 2445-2464.
26 Molineaux CJ, Feuerstein G, Faden AL, Cox BM. Disribution of immunoreactive dynorphin in discrete brain nuclei; comparison with vasopressin. Neurosci Lett 1982; 33: 179-184.
27.Svingos AL,Garzon M, Colago EE, Pickel VM. Mu-opioid receptors in the ventral tegmental area are targeted to presynaptically and directly modulate mesocortical projection neurons. Synapse 2001; 41: 221–229.
28. Van den Berg CL, Kitchen I, Gerrits MAFM, Spruijt BM, Van Ree JM. Morphine treatment during juvenile isolation increases social activity and opioid peptides release in the adult rat. Brain Res1999; 830: 16–23.
29. Wooley JD, Lee BS, Kim B, Fields HL. Opposing effects of intra-nucleus accombens mu and kappa opioid agonists on sensory specific satiety. Neurosci 2007; 146(4):1445-52.
30. Sanger DJ, McCarthy PS. Differential effects of food and water intake in food deprived and freely-feeding rats. Psychopharmacol 1980; 72(1): 103-6.
31. Calignano A, Persico P,Mancuso F, Sorrentino L. Endogenous nitric oxide modulates morphine-induced changes in locomotion and food intake in mice. Eur J Pharmaol 1993; 231(3): 415-9.
32. Pothos EN, Creese I, Hoebel BG. Restricted eating with weight loss selectively decreases extracellular dopamine in the nucleus accumbens and alters dopamine response to amphetamine, morphine, and food intake. J Neurosci 1995; 15(10): 6640-50.
33. Wise RA, Leone P, Rivest R, Leeb K. Elevations of nucleus accumbens dopamine and DOPAC levels during intravenous heroin self-administration. Synapse 1995; 21(2): 140-8.
34. Kiyatkin EA, Wise RA, Gratton A. Drug- and behavior-associated changes in dopamine-related electrochemical signals during intravenous heroin self-administration in rats. Synapse 1993; 14(1): 60-72.
35. Hemby SE, Martin TJ, Co C, Dworkin SI, Smith JE. The effects of intravenous heroin administration on extracellular nucleus accumbens dopamine concentrations as determined by in vivo microdialysis. J Pharmacol Exp Ther1995; 273(2): 591-8.