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Vörös D, Kiss O, Taigiszer M, László BR, Ollmann T, Péczely L, Zagorácz O, Kertes E, Kállai V, Berta B, Kovács A, Karádi Z, Lénárd L, László K. The role of intraamygdaloid oxytocin in spatial learning and avoidance learning. Peptides 2024; 175:171169. [PMID: 38340898 DOI: 10.1016/j.peptides.2024.171169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/26/2024] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
The goal of the present study is to investigate the role of intraamygdaloid oxytocin in learning-related mechanisms. Oxytocin is a neuropeptide which is involved in social bonding, trust, emotional responses and various social behaviors. By conducting passive avoidance and Morris water maze tests on male Wistar rats, the role of intraamygdaloid oxytocin in memory performance and learning was investigated. Oxytocin doses of 10 ng and 100 ng were injected into the central nucleus of the amygdala. Our results showed that 10 ng oxytocin significantly reduced the time required to locate the platform during the Morris water maze test while significantly increasing the latency time in the passive avoidance test. However, the 100 ng oxytocin experiment failed to produce a significant effect in either of the tests. Wistar rats pretreated with 20 ng oxytocin receptor antagonist (L-2540) were administered 10 ng of oxytocin into the central nucleus of the amygdala and were also subjected to the aforementioned tests to highlight the role of oxytocin receptors in spatial- and avoidance learning. Results suggest that oxytocin supports memory processing during both the passive avoidance and the Morris water maze tests. Oxytocin antagonists can however block the effects of oxytocin in both tests. The results substantiate that oxytocin uses oxytocin receptors to enhance memory and learning performance.
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Affiliation(s)
- Dávid Vörös
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Orsolya Kiss
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Márton Taigiszer
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Bettina Réka László
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary
| | - Tamás Ollmann
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - László Péczely
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Olga Zagorácz
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Erika Kertes
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Veronika Kállai
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Beáta Berta
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Learning in Biological and Artificial Systems Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary
| | - Anita Kovács
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary
| | - Zoltán Karádi
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Cellular Bioimpedance Research Group, Szentágothai Research Center, University of Pécs, 7602 Pécs, Hungary; Molecular Endocrinology and Neurophysiology Research Group, Szentágothai Center, University of Pécs, 7602 Pécs, Hungary
| | - László Lénárd
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary; Molecular Endocrinology and Neurophysiology Research Group, Szentágothai Center, University of Pécs, 7602 Pécs, Hungary
| | - Kristóf László
- Medical School, Institute of Physiology, University of Pécs, Szigeti Str. 12, P.O. Box 99, 7602 Pécs, Hungary; Neuropeptides, Cognition, Animal Models of Neuropsychiatric Disorders Research Group, Medical School, Institute of Physiology, University of Pécs, 7602 Pécs, Hungary; Neuroscience Center, University of Pécs, 7602 Pécs, Hungary.
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Ollmann T, Lénárd L, Péczely L, Berta B, Kertes E, Zagorácz O, Hormay E, László K, Szabó Á, Gálosi R, Karádi Z, Kállai V. Effect of D1- and D2-like Dopamine Receptor Antagonists on the Rewarding and Anxiolytic Effects of Neurotensin in the Ventral Pallidum. Biomedicines 2022; 10:biomedicines10092104. [PMID: 36140205 PMCID: PMC9495457 DOI: 10.3390/biomedicines10092104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 12/04/2022] Open
Abstract
Background: Neurotensin (NT) acts as a neurotransmitter and neuromodulator in the central nervous system. It was shown previously that NT in the ventral pallidum (VP) has rewarding and anxiolytic effects. NT exerts its effect in interaction with dopamine (DA) receptors in numerous brain areas; however, this has not yet been investigated in the VP. The aim of this study was to examine whether the inhibition of D1-like and D2-like DA receptors of the VP can modify the above mentioned effects of NT. Methods: Microinjection cannulas were implanted by means of stereotaxic operations into the VP of male Wistar rats. The rewarding effect of NT was examined by means of a conditioned place preference test. Anxiety was investigated with an elevated plus maze test. To investigate the possible interaction, D1-like DA receptor antagonist SCH23390 or D2-like DA receptor antagonist sulpiride were microinjected prior to NT. All of the drugs were also injected independently to analyze their effects alone. Results: In the present experiments, both the rewarding and anxiolytic effects of NT in the VP were prevented by both D1-like and D2-like DA receptor antagonists. Administered on their own, the antagonists did not influence reward and anxiety. Conclusion: Our present results show that the activity of the D1-like and D2-like DA receptors of the VP is a necessary requirement for both the rewarding and anxiolytic effects of NT.
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Affiliation(s)
- Tamás Ollmann
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
- Correspondence: ; Tel.: +36-72-536000 (ext. 31095)
| | - László Lénárd
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
- Molecular Neuroendocrinology and Neurophysiology Research Group, Szentágothai Center, University of Pécs, H-7624 Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Beáta Berta
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Erika Kertes
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Olga Zagorácz
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Edina Hormay
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Ádám Szabó
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Rita Gálosi
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
| | - Zoltán Karádi
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
- Molecular Neuroendocrinology and Neurophysiology Research Group, Szentágothai Center, University of Pécs, H-7624 Pécs, Hungary
| | - Veronika Kállai
- Institute of Physiology, Medical School, University of Pécs, H-7624 Pécs, Hungary
- Centre for Neuroscience, University of Pécs, H-7624 Pécs, Hungary
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Zagorácz O, Ollmann T, Péczely L, László K, Kovács A, Berta B, Kállai V, Kertes E, Lénárd L. QRFP administration into the medial hypothalamic nuclei improves memory in rats. Brain Res 2019; 1727:146563. [PMID: 31765630 DOI: 10.1016/j.brainres.2019.146563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 10/31/2019] [Accepted: 11/19/2019] [Indexed: 10/25/2022]
Abstract
Even though several of RFamide peptides have been shown to modify memory and learning processes in different species, almost nothing is known regarding cognitive effects of recently discovered neuropeptide QRFP. Considering multiple physiological functions of QRFP, localization of QRFP-synthesizing neurons in the hypothalamus and its' widely spread binding sites within the CNS, the present study was designed to investigate the possible role of QRFP in the consolidation of spatial memory. As target area for microinjection, the medial hypothalamic area, including dorsomedial (DMN) and ventromedial (VMN) nuclei, has been chosen. At first, the effects of two doses (200 ng and 400 ng) of QRFP were investigated in Morris water maze. After that receptor antagonist BIBP3226 (equimolar amount to the effective dose of neuropeptide) was applied to elucidate whether it can prevent effects of QRFP. To reveal possible changes in anxiety level, animals were tested in Elevated plus maze. The higher dose of QRFP (400 ng) improved short-term memory consolidation in Morris water maze. Pretreatment with antagonist BIBP3226 abolished cognitive effects of QRFP. The neuropeptide did not affect anxiety level of rats. This study provides unique evidence regarding the role of QRFP in the consolidation of memory and gives the basis for further investigations of neuropeptide's cognitive effects.
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Affiliation(s)
- Olga Zagorácz
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Tamás Ollmann
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Anita Kovács
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Beáta Berta
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Veronika Kállai
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Erika Kertes
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - László Lénárd
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary; Molecular Neurophysiology Research Group, Pécs University, Szentágothai Research Center, Pécs, Hungary.
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Berta B, Kertes E, Péczely L, Ollmann T, László K, Gálosi R, Kállai V, Petykó Z, Zagorácz O, Kovács A, Karádi Z, Lénárd L. Ventromedial prefrontal cortex is involved in preference and hedonic evaluation of tastes. Behav Brain Res 2019; 367:149-157. [PMID: 30940513 DOI: 10.1016/j.bbr.2019.03.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 03/29/2019] [Accepted: 03/29/2019] [Indexed: 01/01/2023]
Abstract
The ventromedial prefrontal cortex (vmPFC) of rats has reciprocal connections with the gustatory and the hedonic impact coding structures. The main goal of the present study was to investigate the involvement of local neurons of vmPFC and their catecholaminergic innervations in taste preference and taste reactivity test. Therefore, kainate or 6-hydroxydopamine (6-OHDA) lesions were performed in the vmPFC by iontophoretic method. In the first experiment, taste preference was tested to 250 mM and 500 mM glucose solutions over water in two-bottle choice test. In the second experiment, taste reactivity was examined to 4 concentrations of glucose solutions (250 mM, 500 mM, 750 mM and 1000 mM) and 4 concentrations of quinine solutions (0.125 mM, 0.25 mM, 1.25 mM and 2.5 mM). Our results showed, that kainate microlesion of vmPFC did not modify the preference of 250 mM and 500 mM glucose solutions in two-bottle choice test. In contrast, 6-OHDA microlesion of vmPFC resulted in increased preference to the higher concentration of glucose (500 mM) solution over water. Results of taste reactivity test showed that kainate lesion resulted in more ingestive and less rejective responses to 750 mM glucose solution and elevated rejectivity to the higher concentrations (1.25 mM and 2.5 mM) of quinine solutions. 6-OHDA lesion of vmPFC increased the number of ingestive responses to highly concentrated (500 mM, 750 mM and 1000 mM) glucose solutions and decreased the number of ingestive responses to the lower concentration (0.125 mM) of quinine solution. The present data provide evidence for the important role of vmPFC neurons and catecholaminergic innervation of the vmPFC in the regulation of hedonic evaluation of tastes and in the hedonic consummatory behavior.
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Affiliation(s)
- Beáta Berta
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Erika Kertes
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Tamás Ollmann
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Rita Gálosi
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Veronika Kállai
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Zoltán Petykó
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary
| | - Olga Zagorácz
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Anita Kovács
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Zoltán Karádi
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary
| | - László Lénárd
- Institute of Physiology, Medical School, Pécs University, Pécs, Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary.
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Berta B, Péczely L, Kertes E, Petykó Z, Ollmann T, László K, Kállai V, Kovács A, Zagorácz O, Gálosi R, Karádi Z, Lénárd L. Iontophoretic microlesions with kainate or 6-hydroxidopamine in ventromedial prefrontal cortex result in deficit in conditioned taste avoidance to palatable tastants. Brain Res Bull 2018; 143:106-115. [PMID: 30347263 DOI: 10.1016/j.brainresbull.2018.10.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 09/12/2018] [Accepted: 10/04/2018] [Indexed: 02/08/2023]
Abstract
Effects of kainate or 6-hydroxidopamine (6-OHDA) lesions in the ventromedial prefrontal cortex (vmPFC) on taste-related learning and memory processes were examined. Neurotoxins were applied by iontophoretic method to minimize the extent of lesion and the side effects. Acquisition and retention of conditioned taste avoidance (CTA) was tested to different taste stimuli (0.05 M NaCl, 0.01 M saccharin, 0.01 M citrate and 0.00025 M quinine). In the first experiment, palatability index of taste solutions with these concentrations has been determined as strongly palatable (NaCl, saccharin), weakly palatable (citrate) and weakly unpalatable (quinine) taste stimuli. In two other experiments vmPFC lesions were performed before CTA (acquisition) or after CTA (retrieval). Our results showed that both kainate and 6-OHDA microlesions of vmPFC resulted in deficit of CTA acquisition (to NaCl, saccharin and citrate) and retrieval (to NaCl and saccharin). Deficits were specific to palatable tastants, particularly those that are strongly palatable, and did not occur for unpalatable stimulus. The present data provide evidence for the important role of vmPFC neurons and catecholaminergic innervation of the vmPFC in taste related learning and memory processes.
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Affiliation(s)
- Beáta Berta
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Erika Kertes
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Zoltán Petykó
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary
| | - Tamás Ollmann
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Veronika Kállai
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Anita Kovács
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Olga Zagorácz
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Rita Gálosi
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary
| | - Zoltán Karádi
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary
| | - László Lénárd
- Institute of Physiology, Medical School, Pécs University, Pécs Hungary; Neuroscience Center, Pécs University, Pécs, Hungary; Molecular Neuroendocrinology Research Group, Szentágothai Research Center, Pécs University, Pécs, Hungary.
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Lénárd L, László K, Kertes E, Ollmann T, Péczely L, Kovács A, Kállai V, Zagorácz O, Gálosi R, Karádi Z. Substance P and neurotensin in the limbic system: Their roles in reinforcement and memory consolidation. Neurosci Biobehav Rev 2018; 85:1-20. [DOI: 10.1016/j.neubiorev.2017.09.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 08/24/2017] [Accepted: 09/02/2017] [Indexed: 12/18/2022]
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Zagorácz O, Kovács A, László K, Ollmann T, Péczely L, Lénárd L. Effects of direct QRFP-26 administration into the medial hypothalamic area on food intake in rats. Brain Res Bull 2015; 118:58-64. [PMID: 26385088 DOI: 10.1016/j.brainresbull.2015.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 09/08/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
Abstract
The RFamide peptide family comprises a number of biologically active peptides sharing RF motif at their C-terminal end. These peptides are involved in the control of multiple physiological functions including regulation of metabolism and feeding behavior. QRFP-43 as well as its 26-aminoacid residue QRFP-26 are able to cause orexigenic effect when administered to the rodents' cerebral ventricles. QRFPs have been suggested as the endogenous ligands of the previously orphan GPR103 receptors. GPR103 receptors share amino acid identity with other receptors of neuropeptides involved in feeding (NPY, NPFF, galanin). QRFP-26 expressing neurons and binding sites are densely present in the rat medial hypothalamus (MHA), an area directly responsible for the regulation of feeding. QRFP-26 was delivered to the target area by direct intrahypothalamic microinjection, and the consumption of liquid food was measured over a 60 min period. Both doses (100 and 200 ng) significantly increased food intake. Non-specific receptor antagonist BIBP3226 eliminated the orexigenic effect caused by QRFP-26 administration. Effective doses of QRFP-26 did not modify general locomotor activity and behavioral patterns examined in the open-field test. This study is the first reporting feeding modulating effects following direct intrahypothalamic QRFP-26 administration.
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Affiliation(s)
- Olga Zagorácz
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Anita Kovács
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - Tamás Ollmann
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary
| | - László Lénárd
- Institute of Physiology, Pécs University Medical School, Pécs, Hungary; Molecular Neurophysiology Research Group, Pécs University, Szentágothai Research Center, Pécs, Hungary.
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Ollmann T, Péczely L, László K, Kovács A, Gálosi R, Kertes E, Kállai V, Zagorácz O, Karádi Z, Lénárd L. Anxiolytic effect of neurotensin microinjection into the ventral pallidum. Behav Brain Res 2015; 294:208-14. [PMID: 26296669 DOI: 10.1016/j.bbr.2015.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 08/10/2015] [Accepted: 08/13/2015] [Indexed: 01/31/2023]
Abstract
Neurotensin (NT) acts as a neurotransmitter and neuromodulator in the central nervous system. NT is involved in reward and memory processes, drug addiction and also in the regulation of anxiety. The ventral pallidum (VP) receives neurotensinergic innervation from the ventral striatopallidal pathway originating from the nucleus accumbens. Positive reinforcing effects of NT in the VP had been shown recently, however the possible effects of NT on anxiety have not been examined yet. In our present experiments, the effects of NT on anxiety were investigated in the VP. In male Wistar rats bilateral microinjections of 100 ng or 250 ng NT were delivered in the volume of 0.4 μl into the VP, and elevated plus maze (EPM) test was performed. In another groups of animals, 35 ng NT-receptor 1 (NTR1) antagonist SR 48,692 was applied by itself, or microinjected 15 min before 100 ng NT treatment. Open field test (OPF) was also conducted. The 100 ng dose of NT had anxiolytic effect, but the 250 ng NT did not influence anxiety. The antagonist pretreatment inhibited the effect of NT, while the antagonist itself had no effect. In the OPF test there was no difference among the groups. Our present results show that microinjection of NT into the VP induces anxiolytic effect, which is specific to the NTR1 receptors because it can be eliminated by a specific NTR1 antagonist. It is also substantiated that neither the NT, nor the NTR1 antagonist in the VP influences locomotor activity.
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Affiliation(s)
- Tamás Ollmann
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - László Péczely
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Kristóf László
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Anita Kovács
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Rita Gálosi
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Erika Kertes
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Veronika Kállai
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Olga Zagorácz
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary
| | - Zoltán Karádi
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary; Molecular Neuroendocrinology and Neurophysiology Research Group, Pécs University, Szentágothai Center, Pécs, Hungary
| | - László Lénárd
- Institute of Physiology, Pécs University, Medical School, Pécs, Hungary; Molecular Neuroendocrinology and Neurophysiology Research Group, Pécs University, Szentágothai Center, Pécs, Hungary.
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