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Advanced Pharmaceutical Bulletin
ISSN: 2228-5881      eISSN: 2251-7308  
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Article History
Submitted: 24 Dec 2012
Revised: 10 Jan 2013
First published online: 20 Aug 2013

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Adv Pharm Bull. 2013;3(2):265-271 doi: 10.5681/apb.2013.043
PMID:24312846        PMCID:PMC3848244

NPY Receptors Blockade Prevents Anticonvulsant Action of Ghrelin in the Hippocampus of Rat

Original Research

Mina Ghahramanian Golzar, Shirin Babri, Zohre Ataie, Hadi Ebrahimi, Fariba Mirzaie, Gisou Mohaddes *


Abstract
Purpose: Ghrelin has been shown to have antiepileptic function. However, the underlying mechanisms by which, ghrelin exerts its antiepileptic effects are still unclear. In the present study, we investigated whether neuropeptide Y (NPY) mediates ghrelin anticonvulsant effect in the brain through its Y1, Y2 or Y5 receptors. Methods: Male Wistar rats were bilaterally microinjected with ghrelin 0.3 nmol/μl/side and NPY antagonists; GR231118 (Y1 receptor antagonist), BIIE0246 (Y2 receptor antagonist), CGP71683 (Y5 receptor antagonist) or solvents (Saline, DMSO) into the dorsal hippocampus 20 minutes before ghrelin administration. Thirty minutes after ghrelin microinjection, a single convulsive dose of pentylenetetrazole (PTZ) (50 mg/kg) was injected intraperitoneally (ip). Afterwards, duration of seizure and total seizure score (TSS) were assessed for 30 minutes in all animals. Results: Intrahippocampal injection of 0.3 nmol/μl/side ghrelin decreased duration of seizure and TSS induced by PTZ. The suppression of both duration (p<0.001) and TSS (p<0.001) induced by ghrelin in hippocampus were significantly blocked by GR231118 (10 μg/μl/side), BIIE0246 (400 pmol/μl/side) and CGP 71683A (5 nmol/μl/side). Conclusion: Our findings suggest that NPY Y1, Y2 and Y5 receptors in the hippocampus may somehow mediate the anticonvulsive action of ghrelin. Therefore, it is possible to speculate that ghrelin acts in the hippocampus to modulate seizures via NPY.





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Articles by Ghahramanian Golzar M
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Articles by Ghahramanian Golzar M
Articles by Babri S
Articles by Ataie Z
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