1
|
Dampening of neurotransmitter action: molecular similarity within the melatonin structure. Endocr Regul 2019; 52:199-207. [PMID: 31517615 DOI: 10.2478/enr-2018-0025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVES Melatonin initiates physiologic and therapeutic responses in various tissues through binding to poorly defined MT receptors regulated by G-proteins and purine nucleotides. Melatonin's interaction with other G-protein regulated receptors, including those of serotonin, is unclear. This study explores the potential for the interaction of melatonin with nucleotide and receptor ligand structures. METHODS The study uses a computational program to investigate relative molecular similarity by the comparative superimposition and quantitative fitting of molecular structures to adenine and guanine nucleotide templates. RESULTS A minimum energy melatonin conformer replicates the nucleotide fits of ligand structures that regulate Gαi and Gαq proteins via serotonin, dopamine, opioid, α-adrenoceptor, and muscarinic receptor classes. The same conformer also replicates the nucleotide fits of ligand structures regulating K+ and Ca2+ ion channels. The acyl-methoxy distance within the melatonin conformer matches a carbonyl-hydroxyl distance in guanine nucleotide. CONCLUSION Molecular similarity within the melatonin and ligand structures relates to the established effects of melatonin on cell receptors regulated by purine nucleotides in cell signal transduction processes. Pharmacologic receptor promiscuity may contribute to the widespread effects of melatonin.
Collapse
|
2
|
Prado NJ, Casarotto M, Calvo JP, Mazzei L, Ponce Zumino AZ, García IM, Cuello-Carrión FD, Fornés MW, Ferder L, Diez ER, Manucha W. Antiarrhythmic effect linked to melatonin cardiorenal protection involves AT 1 reduction and Hsp70-VDR increase. J Pineal Res 2018; 65:e12513. [PMID: 29851143 DOI: 10.1111/jpi.12513] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 05/14/2018] [Indexed: 12/15/2022]
Abstract
Lethal ventricular arrhythmias increase in patients with chronic kidney disease that suffer an acute coronary event. Chronic kidney disease induces myocardial remodeling, oxidative stress, and arrhythmogenesis. A manifestation of the relationship between kidney and heart is the concomitant reduction in vitamin D receptor (VDR) and the increase in angiotensin II receptor type 1 (AT1 ). Melatonin has renal and cardiac protective actions. One potential mechanism is the increase in the heat shock protein 70 (Hsp70)-an antioxidant factor. We aim to determine the mechanisms involved in melatonin (Mel) prevention of kidney damage and arrhythmogenic heart remodeling. Unilateral ureteral-obstruction (UUO) and sham-operated rats were treated with either melatonin (4 mg/kg/day) or vehicle for 15 days. Hearts and kidneys from obstructed rats showed a reduction in VDR and Hsp70. Associated with AT1 up-regulation in the kidneys and the heart of UUO rats also increased oxidative stress, fibrosis, apoptosis, mitochondrial edema, and dilated crests. Melatonin prevented these changes and ventricular fibrillation during reperfusion. The action potential lengthened and hyperpolarized in melatonin-treated rats throughout the experiment. We conclude that melatonin prevents renal damage and arrhythmogenic myocardial remodeling during unilateral ureteral obstruction due to a decrease in oxidative stress/fibrosis/apoptosis associated with AT1 reduction and Hsp70-VDR increase.
Collapse
MESH Headings
- Actins/metabolism
- Animals
- Apoptosis/drug effects
- Fibrosis/metabolism
- HSP70 Heat-Shock Proteins/genetics
- HSP70 Heat-Shock Proteins/metabolism
- In Situ Nick-End Labeling
- In Vitro Techniques
- Kidney/metabolism
- Male
- Melatonin/therapeutic use
- Microscopy, Electron
- Microscopy, Fluorescence
- Mitochondria/drug effects
- Mitochondria/metabolism
- Myocardium/metabolism
- NADPH Oxidases/metabolism
- Rats
- Rats, Inbred WKY
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 1/metabolism
- Receptors, Calcitriol/genetics
- Receptors, Calcitriol/metabolism
- Tachycardia, Ventricular/drug therapy
- Tachycardia, Ventricular/metabolism
Collapse
Affiliation(s)
- Natalia Jorgelina Prado
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Mariana Casarotto
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Juan Pablo Calvo
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Luciana Mazzei
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Amira Zulma Ponce Zumino
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Isabel Mercedes García
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Fernando Darío Cuello-Carrión
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - Miguel Walter Fornés
- Instituto de Histología y Embriología "Dr. Mario H. Burgos" (IHEM), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
| | - León Ferder
- Department of Pediatrics, Nephrology Division, Miller School of Medicine, University of Miami, Miami, FL, USA
| | - Emiliano Raúl Diez
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Walter Manucha
- Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| |
Collapse
|
3
|
Mendoza-Vargas L, Guarneros-Bañuelos E, Báez-Saldaña A, Galicia-Mendoza F, Flores-Soto E, Fuentes-Pardo B, Alvarado R, Valdés-Tovar M, Sommer B, Benítez-King G, Solís-Chagoyán H. Involvement of Melatonin in the Regulation of the Circadian System in Crayfish. Int J Mol Sci 2018; 19:ijms19072147. [PMID: 30041485 PMCID: PMC6073447 DOI: 10.3390/ijms19072147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 02/07/2023] Open
Abstract
Melatonin (MEL) is an ancient molecule, broadly distributed in nature from unicellular to multicellular species. MEL is an indoleamine that acts on a wide variety of cellular targets regulating different physiological functions. This review is focused on the role played by this molecule in the regulation of the circadian rhythms in crayfish. In these species, information about internal and external time progression might be transmitted by the periodical release of MEL and other endocrine signals acting through the pacemaker. We describe documented and original evidence in support of this hypothesis that also suggests that the rhythmic release of MEL contributes to the reinforcement of the temporal organization of nocturnal or diurnal circadian oscillators. Finally, we discuss how MEL might coordinate functions that converge in the performance of complex behaviors, such as the agonistic responses to establish social dominance status in Procambarus clarkii and the burrowing behavior in the secondary digging crayfish P. acanthophorus.
Collapse
Affiliation(s)
- Leonor Mendoza-Vargas
- Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana-Xochimilco (UAM-Xochimilco), 04960 Ciudad de México, Mexico.
| | - Elizabeth Guarneros-Bañuelos
- Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340 Ciudad de México, Mexico.
| | - Armida Báez-Saldaña
- Departamento de Biología Celular, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico.
| | - Fabiola Galicia-Mendoza
- Departamento El Hombre y su Ambiente, Universidad Autónoma Metropolitana-Xochimilco (UAM-Xochimilco), 04960 Ciudad de México, Mexico.
| | - Edgar Flores-Soto
- Departamento de Farmacología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico.
| | - Beatriz Fuentes-Pardo
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico.
| | - Ramón Alvarado
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, 04510 Ciudad de México, Mexico.
| | - Marcela Valdés-Tovar
- Laboratorio de Neurofarmacología, Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, 14370 Ciudad de México, Mexico.
| | - Bettina Sommer
- Departamento de Investigación en Hiperreactividad Bronquial, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, 14080 Ciudad de México, Mexico.
| | - Gloria Benítez-King
- Laboratorio de Neurofarmacología, Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, 14370 Ciudad de México, Mexico.
| | - Héctor Solís-Chagoyán
- Laboratorio de Neurofarmacología, Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, 14370 Ciudad de México, Mexico.
| |
Collapse
|
4
|
Wu KW, Kou ZW, Mo JL, Deng XX, Sun FY. Neurovascular coupling protects neurons against hypoxic injury via inhibition of potassium currents by generation of nitric oxide in direct neuron and endothelium cocultures. Neuroscience 2016; 334:275-282. [PMID: 27531855 DOI: 10.1016/j.neuroscience.2016.08.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/15/2016] [Accepted: 08/07/2016] [Indexed: 12/15/2022]
Abstract
This study examined the effect of neuron-endothelial coupling on the survival of neurons after ischemia and the possible mechanism underlying that effect. Whole-cell patch-clamp experiments were performed on cortical neurons cultured alone or directly cocultured with brain microvascular endothelial cells (BMEC). Propidium iodide (PI) and NeuN staining were performed to examine neuronal death following oxygen and glucose deprivation (OGD). We found that the neuronal transient outward potassium currents (IA) decreased in the coculture system, whereas the outward delayed-rectifier potassium currents (IK) did not. Sodium nitroprusside, a NO donor, enhanced BMEC-induced IA inhibition and nitro-l-arginine methylester, a NOS inhibitor, partially prevented this inhibition. Moreover, the neurons directly cocultured with BMEC showed more resistance to OGD-induced injury compared with the neurons cultured alone, and that neuroprotective effect was abolished by treatment with NS5806, an activator of the IA. These results indicate that vascular endothelial cells assist neurons to prevent hypoxic injury via inhibiting neuronal IA by production of NO in the direct neuron-BMEC coculture system. These results further provide direct evidence of functional coupling between neurons and vascular endothelial cells. This study clearly demonstrates that vascular endothelial cells play beneficial roles in the pathophysiological processes of neurons after hypoxic injury, suggesting that the improvement of neurovascular coupling or functional remodeling may become an important therapeutic target for preventing brain injury.
Collapse
Affiliation(s)
- Kun-Wei Wu
- Institute of Biomedical Sciences and Department of Neurobiology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; Shanghai Key Laboratory of Clinical Geriatric Medicine, Research Center on Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, PR China
| | - Zeng-Wei Kou
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Research Center on Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai 200032, PR China
| | - Jia-Lin Mo
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Research Center on Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai 200032, PR China
| | - Xu-Xu Deng
- Shanghai Key Laboratory of Clinical Geriatric Medicine, Research Center on Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai 200032, PR China
| | - Feng-Yan Sun
- Institute of Biomedical Sciences and Department of Neurobiology, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; Shanghai Key Laboratory of Clinical Geriatric Medicine, Research Center on Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, PR China; State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai 200032, PR China.
| |
Collapse
|
5
|
Di Bella G, Mascia F, Gualano L, Di Bella L. Melatonin anticancer effects: review. Int J Mol Sci 2013; 14:2410-30. [PMID: 23348932 PMCID: PMC3587994 DOI: 10.3390/ijms14022410] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/14/2013] [Accepted: 01/15/2013] [Indexed: 12/12/2022] Open
Abstract
Melatonin (N-acetyl-5-methoxytryptamine, MLT), the main hormone produced by the pineal gland, not only regulates circadian rhythm, but also has antioxidant, anti-ageing and immunomodulatory properties. MLT plays an important role in blood composition, medullary dynamics, platelet genesis, vessel endothelia, and in platelet aggregation, leukocyte formula regulation and hemoglobin synthesis. Its significant atoxic, apoptotic, oncostatic, angiogenetic, differentiating and antiproliferative properties against all solid and liquid tumors have also been documented. Thanks, in fact, to its considerable functional versatility, MLT can exert both direct and indirect anticancer effects in factorial synergy with other differentiating, antiproliferative, immunomodulating and trophic molecules that form part of the anticancer treatment formulated by Luigi Di Bella (Di Bella Method, DBM: somatostatin, retinoids, ascorbic acid, vitamin D3, prolactin inhibitors, chondroitin-sulfate). The interaction between MLT and the DBM molecules counters the multiple processes that characterize the neoplastic phenotype (induction, promotion, progression and/or dissemination, tumoral mutation). All these particular characteristics suggest the use of MLT in oncological diseases.
Collapse
Affiliation(s)
- Giuseppe Di Bella
- Di Bella Foundation, Via Guglielmo Marconi 51, Bologna 40122, Italy.
| | | | | | | |
Collapse
|
6
|
Huang H, Wang Z, Weng SJ, Sun XH, Yang XL. Neuromodulatory role of melatonin in retinal information processing. Prog Retin Eye Res 2013; 32:64-87. [PMID: 22986412 DOI: 10.1016/j.preteyeres.2012.07.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 07/24/2012] [Accepted: 07/25/2012] [Indexed: 12/15/2022]
Affiliation(s)
- Hai Huang
- Institute of Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, PR China
| | | | | | | | | |
Collapse
|
7
|
Liu Z, Ren G, Zhang T, Yang Z. The inhibitory effects of nano-Ag on voltage-gated potassium currents of hippocampal CA1 neurons. ENVIRONMENTAL TOXICOLOGY 2011; 26:552-558. [PMID: 20549616 DOI: 10.1002/tox.20586] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Accepted: 02/15/2010] [Indexed: 05/29/2023]
Abstract
The application of the nano-sized materials continues to grow at a rapid rate in the fields of medicine, biotechnology, and environmental technology. Voltage-gated potassium currents play a key role in excitable cellular viability and function, especially in the central nervous system. The aim of this study was to investigate the actions of silver nano-particles (nano-Ag) on voltage-activated potassium currents in hippocampal CA1 neurons using whole cell patch-clamp technique. The hydrodynamic mean diameter of nano-Ag (10(-5) g mL(-1) ) was 223.9 nm in artificial cerebrospinal fluid (ACSF). Both types, transient potassium (I(A) ) and delayed rectifier potassium (I(K) ) current amplitudes were inhibited by the nano-Ag (10(-5) g mL(-1) ). The nano-Ag particles produced a hyperpolarizing shift in the activation-voltage curve of I(K) and inactivation-voltage curve of I(A) and also delayed the recovery of I(A) from inactivation. The results suggest that nano-Ag may have potential to alter the excitability of neurons by depressing the potassium channels.
Collapse
Affiliation(s)
- Zhaowei Liu
- The Key Laboratory of Bioactive Materials, College of Medicine, Ministry of Education, Nankai University, Tianjin 300071, China
| | | | | | | |
Collapse
|
8
|
Yang XF, Miao Y, Ping Y, Wu HJ, Yang XL, Wang Z. Melatonin inhibits tetraethylammonium-sensitive potassium channels of rod ON type bipolar cells via MT2 receptors in rat retina. Neuroscience 2010; 173:19-29. [PMID: 21094224 DOI: 10.1016/j.neuroscience.2010.11.028] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 10/29/2010] [Accepted: 11/13/2010] [Indexed: 11/16/2022]
Abstract
By challenging specific receptors, melatonin synthesized and released by photoreceptors regulates various physiological functions in the vertebrate retina. Here, we studied modulatory effects of melatonin on K+ currents of rod-dominant ON type bipolar cells (Rod-ON-BCs) in rat retinal slices by patch-clamp techniques. Double immunofluorescence experiments conducted in isolated cell and retinal section preparations showed that the melatonin MT₂ receptor was expressed in somata, dendrites and axon terminals of rat Rod-ON-BCs. Electrophysiologically, application of melatonin selectively inhibited the tetraethylammonium (TEA)-sensitive K+ current component, but did not show any effect on the 4-aminopyridine (4-AP)-sensitive component. Consistent with the immunocytochemical result, the melatonin effect was blocked by co-application of 4-phenyl-2-propionamidotetralin (4-P-PDOT), a specific MT₂ receptor antagonist. Neither protein kinase A (PKA) nor protein kinase G (PKG) seemed to be involved because both the PKA inhibitor Rp-cAMP and the PKG inhibitor KT5823 did not block the melatonin-induced suppression of the K+ currents. In contrast, application of the phospholipase C (PLC) inhibitor U73122 or the protein kinase C (PKC) inhibitor bisindolylmaleimide IV (Bis IV) eliminated the melatonin effect, and when the Ca²+ chelator BAPTA-containing pipette was used, melatonin failed to inhibit the K+ currents. These results suggest that suppression of the TEA-sensitive K+ current component via activation of MT₂ receptors expressed on rat Rod-ON-BCs may be mediated by a Ca²+-dependent PLC/inositol 1,4,5-trisphosphate (IP₃/PKC signaling pathway.
Collapse
Affiliation(s)
- X-F Yang
- Institutes of Brain Science, Institute of Neurobiology and State Key Laboratory of Medical Neurobiology, Fudan University, 138 Yixueyuan Road, Shanghai 200032, PR China
| | | | | | | | | | | |
Collapse
|
9
|
Liu LY, Hoffman GE, Fei XW, Li Z, Zhang ZH, Mei YA. Delayed rectifier outward K+ current mediates the migration of rat cerebellar granule cells stimulated by melatonin. J Neurochem 2007; 102:333-44. [PMID: 17561939 DOI: 10.1111/j.1471-4159.2007.04669.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Melatonin (MT) may work as a neuromodulator through the associated MT receptors in the central nervous system. Previously, our studies have shown that MT increased the I(K) current via a G protein-related pathway. In the present study, patch-clamp whole-cell recording, transwell migration assays and organotypic cerebellar slice cultures were used to examine the effect of MT on granule cell migration. MT increased the I(K) current amplitude and migration of granule cells. Meanwhile, TEA, the I(K) channel blocker, decreased the I(K) current and slowed the migration of granule cells. Furthermore, the effects of MT on the I(K) current and cell migration were not abolished by pre-incubation with P7791, a specific antagonist of MT(3)R, but were eliminated by the application of the MT(2)R antagonists K185 and 4-P-PDOT. I(K) current and cell migration were decreased by the application of dibutyryl cyclic AMP (dbcAMP), which was in contrast to the MT effect on the I(K) current and cell migration. Incubation with dbcAMP essentially blocked the MT-induced increasing effect. Moreover, incubation of isolated cell cultures in the MT-containing medium also decreased the cAMP immunoreactivity in the granule cells. It is concluded, therefore, that I(K) current, downstream of a cAMP transduction pathway, mediates the migration of rat cerebellar granule cells stimulated by MT.
Collapse
MESH Headings
- Animals
- Animals, Newborn
- Bucladesine/pharmacology
- Cell Differentiation/drug effects
- Cell Differentiation/physiology
- Cell Movement/drug effects
- Cell Movement/physiology
- Cells, Cultured
- Cerebellar Cortex/cytology
- Cerebellar Cortex/growth & development
- Cerebellar Cortex/metabolism
- Culture Media, Conditioned/pharmacology
- Cyclic AMP/metabolism
- Melatonin/metabolism
- Melatonin/pharmacology
- Membrane Potentials/drug effects
- Membrane Potentials/physiology
- Models, Neurological
- Neurons/cytology
- Neurons/drug effects
- Neurons/metabolism
- Organ Culture Techniques
- Patch-Clamp Techniques
- Potassium Channel Blockers/pharmacology
- Potassium Channels, Voltage-Gated/drug effects
- Potassium Channels, Voltage-Gated/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptor, Melatonin, MT2/antagonists & inhibitors
- Receptor, Melatonin, MT2/metabolism
- Receptors, Melatonin/antagonists & inhibitors
- Receptors, Melatonin/metabolism
- Signal Transduction/physiology
Collapse
Affiliation(s)
- Lin-Yun Liu
- Institutes of Brain Science, School of Life Sciences and State Key Laboratory of Medical Neurobiology, Fudan University, Shanghai, China
| | | | | | | | | | | |
Collapse
|
10
|
Amir S, Harbour VL, Robinson B. Pinealectomy does not affect diurnal PER2 expression in the rat limbic forebrain. Neurosci Lett 2006; 399:147-50. [PMID: 16488540 DOI: 10.1016/j.neulet.2006.01.041] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2006] [Revised: 01/20/2006] [Accepted: 01/24/2006] [Indexed: 11/25/2022]
Abstract
A role for the pineal hormone, melatonin, in the regulation of the rhythmic expression of circadian clock genes is suggested by the finding that surgical removal of the pineal gland abolishes the rhythm of expression of clock genes such as Per1 in several neural and endocrine tissues in rodents, including the caudate-putamen (CP) and nucleus accumbens, the hypophyseal pars tuberalis and adrenal cortex. Pinealectomy has no effect on clock gene rhythms in the suprachiasmatic nucleus (SCN), the master circadian clock, as well as in the eyes and heart, indicating that the effect of melatonin on clock gene rhythms is tissue specific. To further study the role of melatonin in the regulation of the rhythm of clock genes, we assessed in rats the effect of pinealectomy on the rhythm of expression of the clock protein, PER2, in a number of key limbic forebrain structures, the oval nucleus of the bed nucleus of the stria terminalis (BNST-OV), the central nucleus of the amygdala (CEA) and the hippocampus (HIPP). Despite previous evidence showing that these regions are sensitive to melatonin, pinealectomy had no effect on the daily rhythm of expression of PER2 within these structures, further supporting the view that the role of endogenous melatonin in the regulation of clock gene expression is tissue specific.
Collapse
Affiliation(s)
- Shimon Amir
- Department of Psychology, Center for Studies in Behavioral Neurobiology, Concordia University, Montréal, Que. H4B 1R6, Canada.
| | | | | |
Collapse
|