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Gallardo-Ortíz IA, Oros-González A, Rodríguez-Manzo G, Garduño-Gutiérrez R, Aragón-Martínez A, Páez-Martínez N. Effect of exercise duration on toluene-induced locomotor sensitization in mice: a focus on the Renin Angiotensin System. Psychopharmacology (Berl) 2024:10.1007/s00213-024-06626-5. [PMID: 38839630 DOI: 10.1007/s00213-024-06626-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 05/23/2024] [Indexed: 06/07/2024]
Abstract
RATIONALE Exercise attenuates addictive behavior; however, little is known about the contribution of exercise duration to this positive effect. The Renin Angiotensin System (RAS) has been implicated both in addictive responses and in the beneficial effects of exercise; though, its role in the advantageous effects of exercise on toluene-induced addictive responses has not been explored. OBJECTIVES To evaluate the impact of different exercise regimens in mitigating the expression of toluene-induced locomotor sensitization and to analyze changes in RAS elements' expression at the mesocorticolimbic system after repeated toluene exposure and following voluntary wheel running in toluene-sensitized animals. METHODS Toluene-induced addictive-like response was evaluated with a locomotor sensitization model in mice. Toluene-sensitized animals had access to running wheels 1, 2, 4 or 24 h/day for 4 weeks; thereafter, locomotor sensitization expression was evaluated after a toluene challenge. RAS elements (ACE and ACE2 enzymes; AT1, AT2 and Mas receptors) expression was determined by Western blot in the VTA, NAc and PFCx of toluene-sensitized mice with and without exercise. RESULTS Individual differences in toluene-induced locomotor sensitization development were observed. Access to wheel running 1 and 2 h/day reduced but 4 and 24 h/day completely blocked locomotor sensitization expression. Repeated toluene exposure changed RAS elements' expression in the VTA, NAc and PFCx, while exercise mainly modified ACE and AT1 in air-exposed and toluene-sensitized mice. CONCLUSIONS Inhalant-exposed animals show different sensitization phenotypes. Exercise duration determined its efficacy to attenuate the addictive-like response. Toluene exposure and exercise each modified RAS, the latter also modifying toluene-induced changes.
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Affiliation(s)
- Itzell A Gallardo-Ortíz
- Unidad de Biomedicina, Carrera de Enfermería, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Estado de México, México
| | - Alain Oros-González
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México, México
| | - Gabriela Rodríguez-Manzo
- Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav), Sede Sur, Ciudad de México, México
| | - René Garduño-Gutiérrez
- Departamento de Farmacobiología, Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav), Sede Sur, Ciudad de México, México
| | - Andrés Aragón-Martínez
- Unidad de Biomedicina, Carrera de Biología, Laboratorio de Gametos y Desarrollo Tecnológico, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Estado de México, México
| | - Nayeli Páez-Martínez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Ciudad de México, México.
- Laboratorio Integrativo para el Estudio de Sustancias Inhalables Adictivas, Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría "Ramón de la Fuente Muñiz", Ciudad de México, México.
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Basmadjian OM, Occhieppo VB, Montemerlo AE, Rivas GA, Rubianes MD, Baiardi G, Bregonzio C. Angiotensin II involvement in the development and persistence of amphetamine-induced sensitization: Striatal dopamine reuptake implications. Eur J Neurosci 2024; 59:2450-2464. [PMID: 38480476 DOI: 10.1111/ejn.16312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 02/06/2024] [Accepted: 02/22/2024] [Indexed: 05/22/2024]
Abstract
Amphetamine (AMPH) exposure induces behavioural and neurochemical sensitization observed in rodents as hyperlocomotion and increased dopamine release in response to a subsequent dose. Brain Angiotensin II modulates dopaminergic neurotransmission through its AT1 receptors (AT1-R), positively regulating striatal dopamine synthesis and release. This work aims to evaluate the AT1-R role in the development and maintenance of AMPH-induced sensitization. Also, the AT1-R involvement in striatal dopamine reuptake was analysed. The sensitization protocol consisted of daily AMPH administration for 5 days and tested 21 days after withdrawal. An AT1-R antagonist, candesartan, was administered before or after AMPH exposure to evaluate the participation of AT1-R in the development and maintenance of sensitization, respectively. Sensitization was evaluated by locomotor activity and c-Fos immunostaining. Changes in dopamine reuptake kinetics were evaluated 1 day after AT1-R blockade withdrawal treatment, with or without the addition of AMPH in vitro. The social interaction test was performed as another behavioural output. Repeated AMPH exposure induced behavioural and neurochemical sensitization, which was prevented and reversed by candesartan. The AT1-R blockade increased the dopamine reuptake kinetics. Neither the AMPH administration nor the AT1-R blockade altered the performance of social interaction. Our results highlight the AT1-R's crucial role in AMPH sensitization. The enhancement of dopamine reuptake kinetics induced by the AT1-R blockade might attenuate the neuroadaptive changes that lead to AMPH sensitization and its self-perpetuation. Therefore, AT1-R is a prominent candidate as a target for pharmacological treatment of pathologies related to dopamine imbalance, including drug addiction and schizophrenia.
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Affiliation(s)
- Osvaldo M Basmadjian
- Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Departamento de Farmacología Otto Orsingher, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Victoria B Occhieppo
- Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Departamento de Farmacología Otto Orsingher, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Antonella E Montemerlo
- INFIQC-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Gustavo A Rivas
- INFIQC-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - María D Rubianes
- INFIQC-CONICET, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Gustavo Baiardi
- Laboratorio de Neurofarmacología, (IIBYT-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Claudia Bregonzio
- Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Departamento de Farmacología Otto Orsingher, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
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Tezcan K, Yananli HR, Demirkapu MJ, Gören MZ, Sakalli HE, Colombo G, Gülhan R. The effect of telmisartan, an angiotensin receptor blocker, on alcohol consumption and alcohol-induced dopamine release in the nucleus accumbens. Alcohol 2021; 96:73-81. [PMID: 34419631 DOI: 10.1016/j.alcohol.2021.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 08/16/2021] [Accepted: 08/16/2021] [Indexed: 10/20/2022]
Abstract
Alcohol use disorder remains a major health problem. The mesocorticolimbic dopaminergic system, including the nucleus accumbens region and multiple neural circuits, is involved in its complex underlying mechanism. For instance, alcohol intake stimulates the central and peripheral renin-angiotensin system and increases angiotensin II levels, which predominantly affect angiotensin 1 receptors both in the periphery and in the brain. In this study, we aimed to investigate the effects of the intracerebroventricularly-administered angiotensin 1 receptor blocker telmisartan on the alcohol consumption of male Sardinian alcohol-preferring (sP) rats and on the alcohol-induced dopamine levels in the nucleus accumbens region in Wistar rats. Acute intracerebroventricular administration of telmisartan (100 nM) reduced the alcohol intake for 24 hours without affecting food and water consumption in sP rats. Acute intracerebroventricular injection of the opioid receptor antagonist naloxone (75 nM), tested as a reference compound, also reduced the alcohol consumption in sP rats; however, naloxone's effect lasted only for 30 minutes. In microdialysis experiments, telmisartan administered intracerebroventricularly did not change dopamine levels in the nucleus accumbens that had been induced by acute intraperitoneal alcohol administration in Wistar rats. According to these results, further studies are needed to elucidate the role of the renin-angiotensin system on alcohol use disorder pathophysiology.
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Marchese NA, Artur de laVillarmois E, Basmadjian OM, Perez MF, Baiardi G, Bregonzio C. Brain Angiotensin II AT1 receptors are involved in the acute and long-term amphetamine-induced neurocognitive alterations. Psychopharmacology (Berl) 2016; 233:795-807. [PMID: 26613735 DOI: 10.1007/s00213-015-4153-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 11/13/2015] [Indexed: 02/06/2023]
Abstract
RATIONALE Angiotensin II, by activation of its brain AT1-receptors, plays an active role as neuromodulator in dopaminergic transmission. These receptors participate in the development of amphetamine-induced behavioral and dopamine release sensitization. Dopamine is involved in cognitive processes and provides connectivity between brain areas related to these processes. Amphetamine by its mimetic activity over dopamine neurotransmission elicits differential responses after acute administration or after re-exposure following long-term withdrawal periods in different cognitive processes. OBJECTIVE The purpose of this study is to evaluate the AT1-receptor involvement in the acute and long-term amphetamine-induced alterations in long-term memory and in cellular-related events. METHODS Male Wistar rats (250-300 g) were used in this study. Acute effects: Amphetamine (0.5/2.5 mg/kg i.p.) was administered after post-training in the inhibitory avoidance (IA) response. The AT1-receptor blocker Losartan was administered i.c.v. before a single dose of amphetamine (0.5 mg/kg i.p.). Long-term effects: The AT1-receptors blocker Candesartan (3 mg/kg p.o.) was administered for 5 days followed by 5 consecutive days of amphetamine (2.5 mg/kg/day, i.p.). The neuroadaptive changes were evidenced after 1 week of withdrawal by an amphetamine challenge (0.5 mg/kg i.p.). The IA response, the neuronal activation pattern, and the hippocampal synaptic transmission were evaluated. RESULTS The impairing effect in the IA response of post-training acute amphetamine was partially prevented by Losartan. The long-term changes induced by repeated amphetamine (resistance to acute amphetamine interference in the IA response, neurochemical altered response, and increased hippocampal synaptic transmission) were prevented by AT1-receptors blockade. CONCLUSIONS AT1-receptors are involved in the acute alterations and in the neuroadaptations induced by repeated amphetamine associated with neurocognitive processes.
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Affiliation(s)
- Natalia Andrea Marchese
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET) Departamento de Farmacología, Facultad de Ciencias Químicas Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Emilce Artur de laVillarmois
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET) Departamento de Farmacología, Facultad de Ciencias Químicas Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Osvaldo Martin Basmadjian
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET) Departamento de Farmacología, Facultad de Ciencias Químicas Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Mariela Fernanda Perez
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET) Departamento de Farmacología, Facultad de Ciencias Químicas Universidad Nacional de Córdoba, Córdoba, Argentina.
| | - Gustavo Baiardi
- Laboratorio de Neurofarmacología, (IIBYT-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Claudia Bregonzio
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET) Departamento de Farmacología, Facultad de Ciencias Químicas Universidad Nacional de Córdoba, Córdoba, Argentina
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Stankiewicz AM, Goscik J, Dyr W, Juszczak GR, Ryglewicz D, Swiergiel AH, Wieczorek M, Stefanski R. Novel candidate genes for alcoholism--transcriptomic analysis of prefrontal medial cortex, hippocampus and nucleus accumbens of Warsaw alcohol-preferring and non-preferring rats. Pharmacol Biochem Behav 2015; 139:27-38. [PMID: 26455281 DOI: 10.1016/j.pbb.2015.10.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 10/06/2015] [Accepted: 10/06/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Animal models provide opportunity to study neurobiological aspects of human alcoholism. Changes in gene expression have been implicated in mediating brain functions, including reward system and addiction. The current study aimed to identify genes that may underlie differential ethanol preference in Warsaw High Preferring (WHP) and Warsaw Low Preferring (WLP) rats. METHODS Microarray analysis comparing gene expression in nucleus accumbens (NAc), hippocampus (HP) and medial prefrontal cortex (mPFC) was performed in male WHP and WLP rats bred for differences in ethanol preference. RESULTS Differential and stable between biological repeats expression of 345, 254 and 129 transcripts in NAc, HP and mPFC was detected. Identified genes and processes included known mediators of ethanol response (Mx2, Fam111a, Itpr1, Gabra4, Agtr1a, LTP/LTD, renin-angiotensin signaling pathway), toxicity (Sult1c2a, Ces1, inflammatory response), as well as genes involved in regulation of important addiction-related brain systems such as dopamine, tachykinin or acetylcholine (Gng7, Tac4, Slc5a7). CONCLUSIONS The identified candidate genes may underlie differential ethanol preference in an animal model of alcoholism. COMMENT Names of genes are written in italics, while names of proteins are written in standard font. Names of human genes/proteins are written in all capital letters. Names of rodent genes/proteins are written in capital letter followed by small letters.
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Affiliation(s)
- Adrian M Stankiewicz
- Department of Animal Behaviour, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, 05-552 Jastrzebiec, Poland
| | - Joanna Goscik
- Software Department, Faculty of Computer Science, Bialystok University of Technology, 15-351 Bialystok, Poland
| | - Wanda Dyr
- Department of Pharmacology and Physiology of the Nervous System, Institute of Psychiatry and Neurology, 02-957 Warsaw, Poland
| | - Grzegorz R Juszczak
- Department of Animal Behaviour, Institute of Genetics and Animal Breeding, Polish Academy of Sciences, 05-552 Jastrzebiec, Poland
| | - Danuta Ryglewicz
- First Department of Neurology, Institute of Psychiatry and Neurology, 02-957 Warsaw, Poland
| | - Artur H Swiergiel
- Department of Animal and Human Physiology, Faculty of Biology, University of Gdansk, 80-308 Gdansk, Poland; Department of Pharmacology, Toxicology and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA71130, USA.
| | - Marek Wieczorek
- Department of Neurobiology, Faculty of Biology and Environmental Protection, University of Lodz, 90-236 Lodz, Poland
| | - Roman Stefanski
- Department of Pharmacology and Physiology of the Nervous System, Institute of Psychiatry and Neurology, 02-957 Warsaw, Poland
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Casarsa BS, Marinzalda MÁ, Marchese NA, Paz MC, Vivas L, Baiardi G, Bregonzio C. A previous history of repeated amphetamine exposure modifies brain angiotensin II AT1 receptor functionality. Neuroscience 2015; 307:1-13. [PMID: 26299338 DOI: 10.1016/j.neuroscience.2015.08.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/29/2015] [Accepted: 08/13/2015] [Indexed: 11/19/2022]
Abstract
UNLABELLED Previous results from our laboratory showed that angiotensin II AT1 receptors (AT1-R) are involved in the neuroadaptative changes induced by amphetamine. The aim of the present work was to study functional and neurochemical responses to angiotensin II (ANG II) mediated by AT1-R activation in animals previously exposed to amphetamine. For this purpose male Wistar rats (250-320 g) were treated with amphetamine (2.5mg/kg/day intraperitoneal) or saline for 5 days and implanted with intracerebroventricular (i.c.v.) cannulae. Seven days after the last amphetamine administration the animals received ANG II (400 pmol) i.c.v. One group was tested in a free choice paradigm for sodium (2% NaCl) and water intake and sacrificed for Fos immunoreactivity (Fos-IR) determinations. In a second group of rats, urine and plasma samples were collected for electrolytes and plasma renin activity determination and then they were sacrificed for Fos-IR determination in Oxytocinergic neurons (Fos-OT-IR). RESULTS Repeated amphetamine exposure (a) prevented the increase in sodium intake and Fos-IR cells in caudate-putamen and accumbens nucleus induced by ANG II i.c.v. (b) potentiated urinary sodium excretion and Fos-OT-IR in hypothalamus and (c) increased the inhibitory response in plasma renin activity, in response to ANG II i.c.v. Our results indicate a possible functional desensitisation of AT1-R in response to ANG II, induced by repeated amphetamine exposure. This functional AT1-R desensitisation allows to unmask the effects of ANG II i.c.v. mediated by oxytocin. We conclude that the long lasting changes in brain AT1-R functionality should be considered among the psychostimulant-induced neuroadaptations.
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Affiliation(s)
- B S Casarsa
- Laboratorio de Neurofarmacología, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT-CONICET), Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Universidad Católica de Córdoba, Córdoba, Argentina
| | - M Á Marinzalda
- Laboratorio de Neurofarmacología, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT-CONICET), Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Universidad Católica de Córdoba, Córdoba, Argentina
| | - N A Marchese
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - M C Paz
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - L Vivas
- Instituto de Investigación Médica Mercedes y Martín Ferreyra (INIMEC-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - G Baiardi
- Laboratorio de Neurofarmacología, Instituto de Investigaciones Biológicas y Tecnológicas (IIByT-CONICET), Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Universidad Católica de Córdoba, Córdoba, Argentina
| | - C Bregonzio
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina.
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Bourassa EA, Stedenfeld KA, Sved AF, Speth RC. Selective C1 Lesioning Slightly Decreases Angiotensin II Type I Receptor Expression in the Rat Rostral Ventrolateral Medulla (RVLM). Neurochem Res 2015; 40:2113-20. [PMID: 26138553 DOI: 10.1007/s11064-015-1649-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 06/16/2015] [Accepted: 06/20/2015] [Indexed: 01/28/2023]
Abstract
Cardiovascular homeostasis is regulated in large part by the rostral ventrolateral medulla (RVLM) in mammals. Projections from the RVLM to the intermediolateral column of the thoracolumbar spinal cord innervate preganglionic neurons of the sympathetic nervous system causing elevation of blood pressure and heart rate. A large proportion, but not all, of the neurons in the RVLM contain the enzymes necessary for the production of epinephrine and are identified as the C1 cell group. Angiotensin II (Ang II) activates the RVLM acting upon AT1 receptors. To assess the proportion of AT1 receptors that are located on C1 neurons in the rat RVLM this study employed an antibody to dopamine-beta-hydroxylase conjugated to saporin, to selectively destroy C1 neurons in the RVLM. Expression of tyrosine hydroxylase immunoreactive neurons in the RVLM was reduced by 57 % in the toxin injected RVLM compared to the contralateral RVLM. In contrast, densitometric analysis of autoradiographic images of (125)I-sarcosine(1), isoleucine(8) Ang II binding to AT1 receptors of the injected side RVLM revealed a small (10 %) reduction in AT1-receptor expression compared to the contralateral RVLM. These results suggest that the majority of AT1 receptors in the rat RVLM are located on non-C1 neurons or glia.
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Affiliation(s)
- Erick A Bourassa
- Mississippi College, 200 S Capitol St, Clinton, MS, 39058, USA.
- Department of Pharmacology, School of Pharmacy, University of Mississippi, Oxford, MS, 38677, USA.
| | - Kristen A Stedenfeld
- Department of Neuroscience, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Alan F Sved
- Department of Neuroscience, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | - Robert C Speth
- Department of Pharmacology, School of Pharmacy, University of Mississippi, Oxford, MS, 38677, USA.
- College of Pharmacy, Nova Southeastern University, 3200 S. University Dr., Fort Lauderdale, FL, 33328, USA.
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Speth RC, Carrera EJ, Bretón C, Linares A, Gonzalez-Reiley L, Swindle JD, Santos KL, Schadock I, Bader M, Karamyan VT. Distribution of non-AT1, non-AT2 binding of 125I-sarcosine1, isoleucine8 angiotensin II in neurolysin knockout mouse brains. PLoS One 2014; 9:e105762. [PMID: 25147932 PMCID: PMC4141804 DOI: 10.1371/journal.pone.0105762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 06/13/2014] [Indexed: 11/18/2022] Open
Abstract
The recent identification of a novel binding site for angiotensin (Ang) II as the peptidase neurolysin (E.C. 3.4.24.16) has implications for the renin-angiotensin system (RAS). This report describes the distribution of specific binding of 125I-Sarcosine1, Isoleucine8 Ang II (125I-SI Ang II) in neurolysin knockout mouse brains compared to wild-type mouse brains using quantitative receptor autoradiography. In the presence of p-chloromercuribenzoic acid (PCMB), which unmasks the novel binding site, widespread distribution of specific (3 µM Ang II displaceable) 125I-SI Ang II binding in 32 mouse brain regions was observed. Highest levels of binding >700 fmol/g initial wet weight were seen in hypothalamic, thalamic and septal regions, while the lowest level of binding <300 fmol/g initial wet weight was in the mediolateral medulla. 125I-SI Ang II binding was substantially higher by an average of 85% in wild-type mouse brains compared to neurolysin knockout brains, suggesting the presence of an additional non-AT1, non-AT2, non-neurolysin Ang II binding site in the mouse brain. Binding of 125I-SI Ang II to neurolysin in the presence of PCMB was highest in hypothalamic and ventral cortical brain regions, but broadly distributed across all regions surveyed. Non-AT1, non-AT2, non-neurolysin binding was also highest in the hypothalamus but had a different distribution than neurolysin. There was a significant reduction in AT2 receptor binding in the neurolysin knockout brain and a trend towards decreased AT1 receptor binding. In the neurolysin knockout brains, the size of the lateral ventricles was increased by 56% and the size of the mid forebrain (−2.72 to +1.48 relative to Bregma) was increased by 12%. These results confirm the identity of neurolysin as a novel Ang II binding site, suggesting that neurolysin may play a significant role in opposing the pathophysiological actions of the brain RAS and influencing brain morphology.
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Affiliation(s)
- Robert C. Speth
- Department of Pharmaceutical Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
- Department of Physiology and Functional Genomics, University of Florida, Gainesville, Florida, United States of America
- * E-mail:
| | - Eduardo J. Carrera
- Department of Pharmaceutical Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Catalina Bretón
- Department of Pharmaceutical Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Andrea Linares
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Luz Gonzalez-Reiley
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Jamala D. Swindle
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
| | - Kira L. Santos
- Farquhar College of Arts and Sciences, Nova Southeastern University, Fort Lauderdale, Florida, United States of America
- College of Dentistry, University of Florida, Gainesville, Florida, United States of America
| | - Ines Schadock
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Michael Bader
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Vardan T. Karamyan
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, Texas, United States of America
- Center for Blood-Brain Barrier Research, Texas Tech University Health Sciences Center, Amarillo, Texas, United States of America
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Paz MC, Marchese NA, Stroppa MM, Gerez de Burgos NM, Imboden H, Baiardi G, Cancela LM, Bregonzio C. Involvement of the brain renin-angiotensin system (RAS) in the neuroadaptive responses induced by amphetamine in a two-injection protocol. Behav Brain Res 2014; 272:314-23. [PMID: 25046593 DOI: 10.1016/j.bbr.2014.07.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 07/08/2014] [Accepted: 07/10/2014] [Indexed: 11/25/2022]
Abstract
A single or repeated exposure to psychostimulants induces long-lasting neuroadaptative changes. Different neurotransmitter systems are involved in these responses including the neuropeptide angiotensin II. Our study tested the hypothesis that the neuroadaptative changes induced by amphetamine produce alterations in brain RAS components that are involved in the expression of the locomotor sensitization to the psychostimulant drug. Wistar male rats, pretreated with amphetamine were used 7 or 21 days later to study AT1 receptors by immunohistochemistry and western blot and also angiotensinogen mRNA and protein in caudate putamen and nucleus accumbens. A second group of animals was used to explore the possible role of Ang II AT1 receptors in the expression of behavioral sensitization. In these animals treated in the same way, bearing intra-cerebral cannula, the locomotor activity was tested 21 days later, after an amphetamine challenge injection and the animals received an AT1 blocker, losartan, or saline 5min before the amphetamine challenge. An increase of AT1 receptor density induced by amphetamine was found in both studied areas and a decrease in angiotensinogen mRNA and protein only in CPu at 21 days after treatment; meanwhile, no changes were established in NAcc. Finally, the increased locomotor activity induced by amphetamine challenge was blunted by losartan administration in CPu. No differences were detected in the behavioral sensitization when the AT1 blocker was injected in NAcc. Our results support the hypothesis of a key role of brain RAS in the neuroadaptative changes induced by amphetamine.
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Affiliation(s)
- Maria Constanza Paz
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (UNC), Argentina
| | - Natalia Andrea Marchese
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (UNC), Argentina
| | - Maria Mercedes Stroppa
- Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, UNC, Argentina
| | | | - Hans Imboden
- Institute of Cell Biology, University of Bern, Bern, Switzerland
| | - Gustavo Baiardi
- Laboratorio de Neurofarmacología, Instituto de Investigaciones Biológicas y Tecnológicas (IIBYT- CONICET), Universidad Nacional de Córdoba. Facultad de Ciencias Quimicas, Universidad Católica de Córdoba
| | - Liliana Marina Cancela
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (UNC), Argentina
| | - Claudia Bregonzio
- Instituto de Farmacología Experimental Córdoba (IFEC-CONICET), Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba (UNC), Argentina.
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10
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Angiotensin II AT₁ receptors are involved in neuronal activation induced by amphetamine in a two-injection protocol. BIOMED RESEARCH INTERNATIONAL 2013; 2013:534817. [PMID: 24089683 PMCID: PMC3780567 DOI: 10.1155/2013/534817] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 06/14/2013] [Accepted: 06/18/2013] [Indexed: 11/18/2022]
Abstract
It was already found that Ang II AT1 receptors are involved in the neuroadaptative changes induced by a single exposure to amphetamine, and such changes are related to the development of behavioral and neurochemical sensitization. The induction of the immediately early gene c-fos has been used to define brain activated areas by amphetamine. Our aim was to evaluate the participation of AT1 receptors in the neuronal activation induced by amphetamine sensitization. The study examined the c-fos expression in mesocorticolimbic areas induced by amphetamine challenge (0.5 mg/kg i.p) in animals pretreated with candesartan, a selective AT1 receptor blocker (3 mg/kg p.o × 5 days), and amphetamine (5 mg/kg i.p) 3 weeks before the challenge. Increased c-fos immunoreactivity was found in response to the amphetamine challenge in the dorsomedial caudate-putamen and nucleus accumbens, and both responses were blunted by the AT1 receptor blocker pretreatment. In the infralimbic prefrontal cortex, increased c-fos immunoreactivity was found in response to amphetamine and saline challenge, and both were prevented by the AT1 receptor blocker. No differences were found neither in ventral tegmental area nor prelimbic cortex between groups. Our results indicate an important role for brain Ang II in the behavioral and neuronal sensitization induced by amphetamine.
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11
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Zhang Y, Gao Y, Speth RC, Jiang N, Mao Y, Sumners C, Li H. Adenoviral and adeno-associated viral vectors-mediated neuronal gene transfer to cardiovascular control regions of the rat brain. Int J Med Sci 2013; 10:607-16. [PMID: 23569423 PMCID: PMC3619099 DOI: 10.7150/ijms.5700] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 03/11/2013] [Indexed: 02/03/2023] Open
Abstract
Viral vectors have been utilized extensively to introduce genetic material into the central nervous system. In order to investigate gene functions in cardiovascular control regions of rat brain, we applied WPRE (woodchuck hepatitis virus post-transcriptional regulatory element) enhanced-adenoviral (Ad) and adeno-assoicated virus (AAV) type 2 vectors to mediate neuronal gene delivery to the paraventricular nucleus of the hypothalamus, the nucleus tractus solitarius and the rostral ventrolateral medulla, three important cardiovascular control regions known to express renin-angiotensin system (RAS) genes. Ad or AAV2 harboring an enhanced green fluorescent protein (EGFP) reporter gene or the angiotensin type 2 receptor gene were microinjected into these brain regions in adult rats. Our results demonstrated that both AAV2 and Ad vectors elicited long-term neuronal transduction in these regions. Interestingly, we found that the WPRE caused expression of GFP driven by the synapsin1 promoter in pure glial cultures or co-cultures of neurons and glia derived from rat hypothalamus and brainstem. However, in rat paraventricular nucleus WPRE did not cause expression of GFP in glia. This demonstrates the potential use of these vectors in studies of physiological functions of certain genes in the cardiovascular control regions of the brain.
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Affiliation(s)
- Yanling Zhang
- School of Biotechnology, Southern Medical University, Guangzhou, China
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12
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Gonzalez AD, Wang G, Waters EM, Gonzales KL, Speth RC, Van Kempen TA, Marques-Lopes J, Young CN, Butler SD, Davisson RL, Iadecola C, Pickel VM, Pierce JP, Milner TA. Distribution of angiotensin type 1a receptor-containing cells in the brains of bacterial artificial chromosome transgenic mice. Neuroscience 2012; 226:489-509. [PMID: 22922351 DOI: 10.1016/j.neuroscience.2012.08.039] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/16/2012] [Accepted: 08/17/2012] [Indexed: 10/28/2022]
Abstract
In the central nervous system, angiotensin II (AngII) binds to angiotensin type 1 receptors (AT(1)Rs) to affect autonomic and endocrine functions as well as learning and memory. However, understanding the function of cells containing AT(1)Rs has been restricted by limited availability of specific antisera, difficulties discriminating AT(1)R-immunoreactive cells in many brain regions and, the identification of AT(1)R-containing neurons for physiological and molecular studies. Here, we demonstrate that an Agtr1a bacterial artificial chromosome (BAC) transgenic mouse line that expresses type A AT(1)Rs (AT1aRs) identified by enhanced green fluorescent protein (EGFP) overcomes these shortcomings. Throughout the brain, AT1aR-EGFP was detected in the nuclei and cytoplasm of cells, most of which were neurons. EGFP often extended into dendritic processes and could be identified either natively or with immunolabeling of GFP. The distribution of AT1aR-EGFP cells in brain closely corresponded to that reported for AngII binding and AT1aR protein and mRNA. In particular, AT1aR-EGFP cells were in autonomic regions (e.g., hypothalamic paraventricular nucleus, central nucleus of the amygdala, parabrachial nucleus, nuclei of the solitary tract and rostral ventrolateral medulla) and in regions involved in electrolyte and fluid balance (i.e., subfornical organ) and learning and memory (i.e., cerebral cortex and hippocampus). Additionally, dual label electron microscopic studies in select brain areas demonstrate that cells containing AT1aR-EGFP colocalize with AT(1)R-immunoreactivity. Assessment of AngII-induced free radical production in isolated EGFP cells demonstrated feasibility of studies investigating AT1aR signaling ex vivo. These findings support the utility of Agtr1a BAC transgenic reporter mice for future studies understanding the role of AT(1)R-containing cells in brain function.
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Affiliation(s)
- A D Gonzalez
- Division of Neurobiology, Department of Neurology and Neuroscience, Weill Cornell Medical College, 407 East 61st Street, New York, NY 10065, USA
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13
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Mertens B, Vanderheyden P, Michotte Y, Sarre S. The role of the central renin-angiotensin system in Parkinson's disease. J Renin Angiotensin Aldosterone Syst 2009; 11:49-56. [PMID: 19861346 DOI: 10.1177/1470320309347789] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Since the discovery of a renin-angiotensin system (RAS) in the brain, several studies have linked this central RAS to neurological disorders such as ischaemia, Alzheimer's disease and depression. In the last decade, evidence has accumulated that the central RAS might also play a role in Parkinson's disease. Although the exact cause of this progressive neurodegenerative disorder of the basal ganglia remains unidentified, inflammation and oxidative stress have been suggested to be key factors in the pathogenesis and the progression of the disease. Since angiotensin II is a pro-inflammatory compound that can induce the production of reactive oxygen species due to activation of the NADPH-dependent oxidase complex, this peptide might contribute to dopaminergic cell death. In this review, three different strategies to interfere with the pathogenesis or the progression of Parkinson's disease are discussed. They include inhibition of the angiotensin-converting enzyme, blockade of the angiotensin II type 1 receptor and stimulation of the angiotensin II type 2 receptor.
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Affiliation(s)
- Birgit Mertens
- Department of Pharmaceutical Chemistry and Drug Analysis, Research Group Experimental Neuropharmacology, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Brussels, Belgium
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14
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Rey P, Lopez-Real A, Sanchez-Iglesias S, Muñoz A, Soto-Otero R, Labandeira-Garcia JL. Angiotensin type-1-receptor antagonists reduce 6-hydroxydopamine toxicity for dopaminergic neurons. Neurobiol Aging 2006; 28:555-67. [PMID: 16621167 DOI: 10.1016/j.neurobiolaging.2006.02.018] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2005] [Revised: 02/20/2006] [Accepted: 02/27/2006] [Indexed: 02/07/2023]
Abstract
Angiotensin II activates (via type 1 receptors) NAD(P)H-dependent oxidases, which are a major source of superoxide, and is relevant in the pathogenesis of several cardiovascular diseases and certain degenerative changes associated with ageing. Given that there is a brain renin-angiotensin system and that oxidative stress is a key contributor to Parkinson's disease, we investigated the effects of angiotensin II and angiotensin type 1 (AT(1)) receptor antagonists in the 6-hydroxydopamine model of Parkinson's disease. Rats subjected to intraventricular injection of 6-hydroxydopamine showed bilateral reduction in the number of dopaminergic neurons and terminals. Injection of angiotensin alone did not induce any significant effect. However, angiotensin increased the toxic effect of 6-hydroxydopamine. Rats treated with the AT(1) receptor antagonist ZD 7155 and then 6-hydroxydopamine (with or without exogenous administration of angiotensin) showed a significant reduction in 6-hydroxydopamine-induced oxidative stress (lipid peroxidation and protein oxidation) and dopaminergic degeneration. Dopaminergic degeneration was also reduced by the NAD(P)H inhibitor apocynin. Angiotensin may play a pivotal role, via AT(1) receptors, in increasing the oxidative damage of dopaminergic cells, and treatment with AT(1) antagonists may reduce the progression of Parkinson's disease.
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Affiliation(s)
- P Rey
- Laboratory of Neuroanatomy and Experimental Neurology, Department of Morphological Sciences, Faculty of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain
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15
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Grobe J, Rowland N, Katovich M. Role of angiotensin II and the subfornical organ in the pharmacological actions of ethanol. Alcohol Alcohol 2004; 39:410-7. [PMID: 15289207 DOI: 10.1093/alcalc/agh079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIMS The current study was designed to evaluate if angiotensin II mediates the hypothermic effects of ethanol, and to determine if the effects of angiotensin are mediated centrally. We also tested the hypothesis that the subfornical organ (SFO) is a site responsible for the alterations in body temperature and aerial righting reflex mediated by ethanol and for the modulation of ethanol consumption in rats. METHODS Male Sprague-Dawley rats were used in a series of experiments to evaluate the role of both peripheral and central administration of losartan, a selective angiotensin type 1 receptor antagonist on ethanol-induced hypothermia. Subsequent studies were undertaken in SFO-lesioned rats to evaluate the effects of SFO-lesion on alcohol intake, the thermal response to alcohol and angiotensin, and the aerial righting reflex. RESULTS Selective antagonism of the angiotensin II type 1 receptor, administered either peripherally or centrally, attenuated not only the fall in colonic temperature but also attenuated the transient rise in tail skin temperature that was associated with administration of ethanol. The thermal responses to both angiotensin and ethanol were similarly attenuated in SFO-lesioned rats. Likewise the aerial righting reflex, which has previously been shown to be impaired by losartan treatment, was also significantly attenuated in SFO-lesioned animals. Alcohol intake, as determined by a 48 h, two-bottle preference test also revealed that SFO-lesioned animals consumed significantly less alcohol (ethanolic beer) than did controls. CONCLUSION Collectively, the results demonstrate that ethanol-induced temperature responses are mediated by the renin-angiotensin system and that this interaction is mediated centrally. In addition, the results demonstrate that the SFO is a site that mediates several neurobiological effects of ethanol, possibly via the renin-angiotensin system.
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Affiliation(s)
- Justin Grobe
- Department of Pharmacodynamics, University of Florida, Gainsville, Florida, USA
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16
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Hwang BH, Chan P, Peters T. Angiotensin II receptor binding in the locus ceruleus of spontaneously hypertensive rats and Wistar-Kyoto rats: a quantitative autoradiographic study with references to hypertension and cardiac/testicular hypertrophy. J Biomed Sci 2004; 11:331-8. [PMID: 15067216 DOI: 10.1007/bf02254437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2003] [Accepted: 12/23/2003] [Indexed: 10/25/2022] Open
Abstract
The locus ceruleus (LC) contains a high density of angiotensin II (AII) receptors. The role of AII receptors at the LC in genetic hypertension and organ function is unclear. Spontaneously hypertensive (SHR) rats and Wistar-Kyoto (WKY) rats were studied, and blood pressure of animals was measured using the tail-cuff method. Animals were decapitated and the heart weight (HW) and testicular weight (TW) of animals measured. AII receptor binding was carried out by incubating the LC tissue sections with 200 pM [(125)I]-AII receptor ligand, and measured using quantitative autoradiography. Results showed that the HW/BW ratio was significantly higher in SHR rats than WKY rats. However, the TW/BW ratio was higher in SHR rats than WKY rats only at two hypertensive stages, whereas AII receptor binding capacity in the LC was also statistically higher in SHR rats than WKY rats. Results indicated that cardiac and testicular hypertrophies were related to higher AII receptor binding in the LC of SHR rats, when compared with WKY rats. Interestingly, the literature shows that there is an LC-testes axis. In conclusion, this study indicated that AII receptors in the LC are associated with genetic hypertension, and testicular weight could be a reasonable index for essential hypertension.
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Affiliation(s)
- Bang H Hwang
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
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17
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Maul B, Siems WE, Hoehe MR, Grecksch G, Bader M, Walther T. Alcohol consumption is controlled by angiotensin II. FASEB J 2001; 15:1640-2. [PMID: 11427512 DOI: 10.1096/fj.00-0797fje] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- B Maul
- Institute of Molecular Pharmacology, Berlin, Germany. Genome Research, Hypertension Research, Max-Delbrueck Center for Molecular Medicine, Berlin-Buch, Germany.
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18
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Szabo Z, Speth RC, Brown PR, Kerenyi L, Kao PF, Mathews WB, Ravert HT, Hilton J, Rauseo P, Dannals RF, Zheng W, Lee S, Sandberg K. Use of positron emission tomography to study AT1 receptor regulation in vivo. J Am Soc Nephrol 2001; 12:1350-1358. [PMID: 11423564 DOI: 10.1681/asn.v1271350] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Increased sodium intake and enhanced sodium sensitivity are implicated in the pathogenesis of hypertension and in the control of a major regulator of BP, the type 1 angiotensin receptor (AT(1) receptor). An in vivo technique to study changes of renal AT(1) receptors by dietary sodium was developed that uses positron emission tomography (PET). PET revealed that renal cortical AT(1) receptor binding was increased in sodium-loaded compared with sodium-deprived dogs, which correlated with ex vivo estimations of AT(1) receptor numbers. Plasma renin activity, angiotensin II, and aldosterone were inversely related to changes in AT(1) receptor binding. These results demonstrate, for the first time in vivo, that the renal AT(1) receptor is inversely related to the activity of the renin angiotensin system, which may provide a compensatory mechanism to prevent inappropriate fluctuations in arterial BP. The ability to measure AT(1) receptor binding in vivo has potential significance for clinical studies of AT(1) receptors, because PET is a noninvasive imaging technique that is readily applicable in humans.
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Affiliation(s)
- Zsolt Szabo
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Robert C Speth
- Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, Washington, and Department of Neuroscience, Oregon Regional Primate Research Center, Oregon Health Sciences University, Beaverton, Oregon
| | - P Randy Brown
- Division of Comparative Medicine, The Johns Hopkins University, Baltimore, Maryland
| | - Levente Kerenyi
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Pan Fu Kao
- Chang Gung Memorial Hospital, Department of Nuclear Medicine, Taipei, Taiwan
| | - William B Mathews
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Hayden T Ravert
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - John Hilton
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Paige Rauseo
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Robert F Dannals
- Division of Nuclear Medicine, The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University, Baltimore, Maryland
| | - Wei Zheng
- Division of Nephrology and Hypertension, Georgetown University, Washington, DC
| | - Sunghou Lee
- Division of Nephrology and Hypertension, Georgetown University, Washington, DC
| | - Kathryn Sandberg
- Division of Nephrology and Hypertension, Georgetown University, Washington, DC
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19
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Weng Y, Shukla SD. Ethanol alters angiotensin II stimulated mitogen activated protein kinase in hepatocytes: agonist selectivity and ethanol metabolic independence. Eur J Pharmacol 2000; 398:323-31. [PMID: 10862821 DOI: 10.1016/s0014-2999(00)00313-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Angiotensin II activated mitogen-activated protein kinase (MAPK) (p42 and p44) in rat hepatocytes exposed to ethanol and the relevance of ethanol metabolism on this activation was investigated. Hepatocytes, isolated from rat liver, were treated with or without ethanol for 24 h. Angiotensin II, vasopressin, insulin, serum and epinephrine significantly increased hepatocyte MAPK activity. Platelet activating factor (PAF), tumor necrosis factor-alpha (TNF-alpha), and insulin-like growth factor-1 (IGF-1) had little effect on MAPK activation. Interestingly, among the above agonists, which activated hepatocyte MAPK, ethanol exposure potentiated only angiotensin II and epinephrine-stimulated MAPK. Thus, potentiation of MAPK by ethanol exhibited agonist selectivity. In contrast to several other cells, there was prevalence of p42 over p44 MAPK band in hepatocytes. Angiotensin II treatment caused a rapid activation (peak 5 min) of MAPK followed by a decrease to basal levels in 30 min. Exposure with 100 mM ethanol potentiated the angiotensin II stimulated MAPK activity. This potentiation was partially blocked by pertussis toxin suggesting it to be a G-protein-dependent event. Treatment of the hepatocytes with pyrazole (an inhibitor of ethanol metabolism) or acetaldehyde (an ethanol metabolite) had no effect on potentiation. Thus, ethanol potentiation of hepatocyte MAPK is agonist-selective and independent of ethanol metabolism.
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Affiliation(s)
- Y Weng
- Department of Pharmacology, University of Missouri School of Medicine, Columbia, MO 65212, USA
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