title: GABA(A) receptors mediate orexin-A induced stimulation of food intake.
abstract: Although the role of orexins in sleep/wake cycle and feeding behavior is well established, underlying mechanisms have not been fully understood. An attempt has been made to investigate the role of GABA(A) receptors and their benzodiazepine site on the orexin-A induced response to feeding. Different groups of rats were food deprived overnight and next day injected intracerebroventricularly (icv) with vehicle (artificial CSF; 5 microl/rat) or orexin-A (20-50 nM/rat) and the animals were given free access to food. Cumulative food intake was measured during light phase of light/dark cycle at 1-, 2-, 4- and 6-h post-injection time points. Orexin-A (30-50 nM/rat, icv) stimulated food intake at all the time points (P < 0.05). Prior administration of GABA(A) receptor agonists muscimol (25 ng/rat, icv) and diazepam (0.5 mg/kg, ip) at subeffective doses significantly potentiated the hyperphagic effect of orexin-A (30 nM/rat, icv). However, the effect was negated by the GABA(A) receptor antagonist bicuculline (1 mg/kg, ip). Interestingly, benzodiazepine receptor antagonist flumazenil (5 ng/rat, icv), augmented the orexin-A (30 nM/rat, icv) induced hyperphagia; the effect may be attributed to the intrinsic activity of the agent. The results suggest that the hyperphagic effect of orexin-A, at least in part, is mediated by enhanced GABA(A) receptor activity.
authors.affiliation: Department of Pharmaceutical Sciences, Nagpur University Campus, India.
authors.forename: Dadasaheb M
authors.initials: DM
authors.lastname: Kokare
authors.forename: Angad M
authors.initials: AM
authors.lastname: Patole
authors.forename: Anna
authors.initials: A
authors.lastname: Carta
authors.forename: Chandrabhan T
authors.initials: CT
authors.lastname: Chopde
authors.forename: Nishikant K
authors.initials: NK
authors.lastname: Subhedar
mesh_terms: D000818:Animals; D003975:Diazepam / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects*; D005442:Flumazenil / Q000494:pharmacology; D018755:GABA Agonists / Q000494:pharmacology; D018756:GABA Antagonists / Q000494:pharmacology; D018757:GABA Modulators / Q000494:pharmacology; D058787:GABA-A Receptor Antagonists; D006963:Hyperphagia / Q000139:chemically induced* / Q000523:psychology; D007276:Injections, Intraventricular; D047908:Intracellular Signaling Peptides and Proteins / Q000494:pharmacology*; D008297:Male; D009118:Muscimol / Q000494:pharmacology; D009479:Neuropeptides / Q000494:pharmacology*; D064446:Orexin Receptors; D000068797:Orexins; D051381:Rats; D017207:Rats, Sprague-Dawley; D043562:Receptors, G-Protein-Coupled; D011963:Receptors, GABA-A / Q000187:drug effects*; D018013:Receptors, Neuropeptide; D013268:Stimulation, Chemical
chemical_list: D018755:GABA Agonists; D018756:GABA Antagonists; D018757:GABA Modulators; D058787:GABA-A Receptor Antagonists; D047908:Intracellular Signaling Peptides and Proteins; D009479:Neuropeptides; D064446:Orexin Receptors; D000068797:Orexins; D043562:Receptors, G-Protein-Coupled; D011963:Receptors, GABA-A; D018013:Receptors, Neuropeptide; D009118:Muscimol; D005442:Flumazenil; D003975:Diazepam