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Ono H, Shimizu T, Zou S, Yamamoto M, Shimizu Y, Aratake T, Hamada T, Nagao Y, Shimizu S, Higashi Y, Saito M. Brain nitric oxide induces facilitation of the micturition reflex through brain glutamatergic receptors in rats. Neurourol Urodyn 2020; 39:1687-1699. [DOI: 10.1002/nau.24440] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/28/2020] [Accepted: 06/08/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Hideaki Ono
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
- Innovative Medicine Group, Center for Innovative and Translational Medicine, Kochi Medical SchoolKochi University Nankoku Kochi Japan
| | - Takahiro Shimizu
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Suo Zou
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Masaki Yamamoto
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Yohei Shimizu
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
- Innovative Medicine Group, Center for Innovative and Translational Medicine, Kochi Medical SchoolKochi University Nankoku Kochi Japan
| | - Takaaki Aratake
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
- Research Fellow of Japan Society for the Promotion of Science Japan
| | - Tomoya Hamada
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Yoshiki Nagao
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Shogo Shimizu
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Youichirou Higashi
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
| | - Motoaki Saito
- Department of PharmacologyKochi Medical School, Kochi University Nankoku Kochi Japan
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Shimizu T, Shimizu S, Higashi Y, Nakamura K, Yoshimura N, Saito M. A Stress-Related Peptide Bombesin Centrally Induces Frequent Urination through Brain Bombesin Receptor Types 1 and 2 in the Rat. J Pharmacol Exp Ther 2016; 356:693-701. [PMID: 26729307 DOI: 10.1124/jpet.115.230334] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 12/30/2015] [Indexed: 12/20/2022] Open
Abstract
Stress exacerbates symptoms of bladder dysfunction including overactive bladder and bladder pain syndrome, but the underlying mechanisms are unknown. Bombesin-like peptides and bombesin receptor types 1 and 2 (BB1 and BB2, respectively) in the brain have been implicated in the mediation/integration of stress responses. In this study, we examined effects of centrally administered bombesin on micturition, focusing on their dependence on 1) the sympathoadrenomedullary system (a representative mechanism activated by stress exposure) and 2) brain BB receptors in urethane-anesthetized (1.0-1.2 g/kg, i.p.) male rats. Intracerebroventricularly administered bombesin significantly shortened intercontraction intervals (ICI) at both doses (0.1 and 1 nmol/animal) without affecting maximal voiding pressure. Bombesin at 1 nmol induced significant increments of plasma noradrenaline and adrenaline levels, which were both abolished by acute bilateral adrenalectomy. On the other hand, adrenalectomy showed no effects on the bombesin-induced shortening of ICI. Much lower doses of bombesin (0.01 and 0.03 nmol/animal, i.c.v.) dose-dependently shortened ICI. Pretreatment with either a BB1 receptor antagonist (BIM-23127; d-Nal-cyclo[Cys-Tyr-d-Trp-Orn-Val-Cys]-Nal-NH2; 3 nmol/animal, i.c.v.) or a BB2 receptor antagonist (BEA; H-d-Phe-Gln-Trp-Ala-Val-Gly-His-Leu-NHEt; 3 nmol/animal, i.c.v.), respectively, suppressed the BB (0.03 nmol/animal, i.c.v.)-induced shortening of ICI, whereas each antagonist by itself (1 and 3 nmol/animal, i.c.v.) had no significant effects on ICI. Bombesin (0.03 nmol/animal, i.c.v.) significantly reduced voided volume per micturition and bladder capacity without affecting postvoid residual volume or voiding efficiency. These results suggest that brain bombesin and BB receptors are involved in facilitation of the rat micturition reflex to induce bladder overactivity, which is independent of the sympathoadrenomedullary outflow modulation.
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Affiliation(s)
- Takahiro Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
| | - Shogo Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
| | - Youichirou Higashi
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
| | - Kumiko Nakamura
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
| | - Naoki Yoshimura
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
| | - Motoaki Saito
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan (T.S., S.S., Y.H., K.N., M.S.); and Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (T.S., N.Y.)
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3
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Yawata T, Higashi Y, Shimizu T, Shimizu S, Nakamura K, Taniuchi K, Ueba T, Saito M. Brain opioid and nociceptin receptors are involved in regulation of bombesin-induced activation of central sympatho-adrenomedullary outflow in the rat. Mol Cell Biochem 2015; 411:201-11. [DOI: 10.1007/s11010-015-2582-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 09/26/2015] [Indexed: 11/28/2022]
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4
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Nakamura K, Shimizu T, Yanagita T, Nemoto T, Taniuchi K, Shimizu S, Dimitriadis F, Yawata T, Higashi Y, Ueba T, Saito M. Angiotensin II acting on brain AT1 receptors induces adrenaline secretion and pressor responses in the rat. Sci Rep 2014; 4:7248. [PMID: 25431019 PMCID: PMC5384216 DOI: 10.1038/srep07248] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 11/11/2014] [Indexed: 01/09/2023] Open
Abstract
Angiotensin II (AngII) plays important roles in the regulation of cardiovascular function. Both peripheral and central actions of AngII are involved in this regulation, but mechanisms of the latter actions as a neurotransmitter/neuromodulator within the brain are still unclear. Here we show that (1) intracerebroventricularly (i.c.v.) administered AngII in urethane-anesthetized male rats elevates plasma adrenaline derived from the adrenal medulla but not noradrenaline with valsartan- (AT1 receptor blocker) sensitive brain mechanisms, (2) peripheral AT1 receptors are not involved in the AngII-induced elevation of plasma adrenaline, although AngII induces both noradrenaline and adrenaline secretion from bovine adrenal medulla cells, and (3) i.c.v. administered AngII elevates blood pressure but not heart rate with the valsartan-sensitive mechanisms. From these results, i.c.v. administered AngII acts on brain AT1 receptors, thereby inducing the secretion of adrenaline and pressor responses. We propose that the central angiotensinergic system can activate central adrenomedullary outflow and modulate blood pressure.
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Affiliation(s)
- Kumiko Nakamura
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Takahiro Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Toshihiko Yanagita
- Department of Pharmacology, University of Miyazaki, Faculty of Medicine, Miyazaki 889-1692, Japan
| | - Takayuki Nemoto
- Department of Pharmacology, University of Miyazaki, Faculty of Medicine, Miyazaki 889-1692, Japan
| | - Keisuke Taniuchi
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Shogo Shimizu
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Fotios Dimitriadis
- B' Urologic Department, Papageorgiou General Hospital, Aristotle University School of Medicine, Thessaloniki, Greece
| | - Toshio Yawata
- Department of Neurosurgery, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Youichirou Higashi
- Department of Neurosurgery, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Tetsuya Ueba
- Department of Neurosurgery, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
| | - Motoaki Saito
- Department of Pharmacology, Kochi Medical School, Kochi University, Nankoku 783-8505, Japan
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5
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Altinbas B, Topuz BB, Yilmaz MS, Aydin C, Savci V, Jochem J, Aydin S, Yalcin M. The mediation of the central histaminergic system in the pressor effect of intracerebroventricularly injected melittin, a phospholipase A2 activator, in normotensive rats. Prostaglandins Leukot Essent Fatty Acids 2012; 87:153-8. [PMID: 22995146 DOI: 10.1016/j.plefa.2012.08.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 07/24/2012] [Accepted: 08/22/2012] [Indexed: 11/23/2022]
Abstract
Melittin is a polypeptide component of bee venom that leads to an increase in arachidonic acid release and subsequently in prostaglandin synthesis by activating phospholipase A(2). Recently we demonstrated that centrally or peripherally administrated melittin caused pressor effect and central thromboxane A(2) (TXA(2)) and cholinergic system mediated these effects of melittin. Also centrally injected histamine leads to pressor and bradycardic response by activating central histamine receptors in normotensive rats and central cholinergic system involved the effects of histamine. The present study demonstrates an involvement of the central histaminergic system in melittin-induced cardiovascular effect in normotensive rats. Experiments were carried out in male Sprague Dawley rats. Intracerebroventricularly (i.c.v.) injected melittin (0.5, 1 and 2 nmol) caused dose- and time-dependent increases in mean arterial pressure (MAP) and decrease in heart rate (HR) as we reported previously. Moreover, H(2) receptor antagonist ranitidine (50 nmol; i.c.v.) almost completely and H(3)/H(4) receptor antagonist thioperamide (50 nmol; i.c.v.) partly blocked melittin-evoked cardiovascular effects, whereas H(1) receptor blocker chlorpheniramine (50 nmol; i.c.v.) had no effect. Also centrally injected melittin was accompanied by 28% increase in extracellular histamine concentration in the posterior hypothalamus, as shown in microdialysis studies. In conclusion, results show that centrally administered melittin causes pressor and bradycardic response in conscious rats. Moreover, according to our findings, there is an involvement of the central histaminergic system in melittin-induced cardiovascular effects.
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Affiliation(s)
- Burcin Altinbas
- Department of Physiology, Faculty of Veterinary Medicine, Uludag University, 16059 Bursa, Turkey
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Tanaka K, Shimizu T, Lu L, Nakamura K, Yokotani K. Centrally administered bombesin activates COX-containing spinally projecting neurons of the PVN in anesthetized rats. Auton Neurosci 2012; 169:63-9. [PMID: 22537831 DOI: 10.1016/j.autneu.2012.03.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 03/23/2012] [Accepted: 03/28/2012] [Indexed: 10/28/2022]
Abstract
The paraventricular nucleus (PVN) of the hypothalamus has a heterogenous structure containing different types of output neurons that project to the median eminence, posterior pituitary, brain stem autonomic centers and sympathetic preganglionic neurons in the spinal cord. Presympathetic neurons in the PVN send mono- and poly-synaptic projections to the spinal cord. In the present study using urethane-anesthetized rats, we examined the effects of centrally administered bombesin (a homologue of the mammalian gastrin-releasing peptide) on the mono-synaptic spinally projecting PVN neurons pre-labeled with a retrograde tracer Fluoro-Gold (FG) injected into T8 level of the spinal cord, with regard to the immunoreactivity for cyclooxygenase (COX) isozymes (COX-1/COX-2) and Fos (a marker of neuronal activation). FG-labeled spinally projecting neurons were abundantly observed in the dorsal cap, ventral part and posterior part of the PVN. The immunoreactivity of each COX-1 and COX-2 was detected in FG-labeled spinally projecting PVN neurons in the vehicle (10 μl of saline/animal, i.c.v.)-treated group, while bombesin (1 nmol/animal, i.c.v.) had no effect on the number of these immunoreactive neurons for each COX isozyme with labeling of FG. On the other hand, the peptide significantly increased the number of double-immunoreactive neurons for Fos and COX-1/COX-2 with FG-labeling in the PVN (except triple-labeled neurons for FG, COX-2 and Fos in the dorsal cap of the PVN), as compared to those of vehicle-treated group. These results suggest that centrally administered bombesin activates spinally projecting PVN neurons containing COX-1 and COX-2 in rats.
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Affiliation(s)
- Kenjiro Tanaka
- Department of Pharmacology, School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan.
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7
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Shimizu T, Tanaka K, Hasegawa T, Yokotani K. Brain α4β2 nicotinic acetylcholine receptors are involved in the secretion of noradrenaline and adrenaline from adrenal medulla in rats. Eur J Pharmacol 2011; 654:241-8. [DOI: 10.1016/j.ejphar.2010.12.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 11/30/2010] [Accepted: 12/15/2010] [Indexed: 10/18/2022]
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8
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Horii Y, Nikaido Y, Nagai K, Nakashima T. Exposure to TMT odor affects adrenal sympathetic nerve activity and behavioral consequences in rats. Behav Brain Res 2010; 214:317-22. [DOI: 10.1016/j.bbr.2010.05.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Revised: 05/25/2010] [Accepted: 05/26/2010] [Indexed: 10/19/2022]
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9
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Shimizu T, Yokotani K. Brain cyclooxygenase and prostanoid TP receptors are involved in centrally administered epibatidine-induced secretion of noradrenaline and adrenaline from the adrenal medulla in rats. Eur J Pharmacol 2009; 606:77-83. [DOI: 10.1016/j.ejphar.2009.01.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2008] [Revised: 01/06/2009] [Accepted: 01/19/2009] [Indexed: 02/07/2023]
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Quagliotto E, Neckel H, Riveiro DF, Casali KR, Mostarda C, Irigoyen MC, Dall'ago P, Rasia-Filho AA. Histamine in the posterodorsal medial amygdala modulates cardiovascular reflex responses in awake rats. Neuroscience 2008; 157:709-19. [PMID: 18955117 DOI: 10.1016/j.neuroscience.2008.09.053] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2008] [Revised: 09/03/2008] [Accepted: 09/29/2008] [Indexed: 11/18/2022]
Abstract
Centrally injected histamine (HA) affects heart rate (HR), arterial blood pressure (BP), and sympathetic activity in rats. The posterodorsal medial amygdala (MePD) has high levels of histidine decarboxylase, connections with brain areas involved with the modulation of cardiovascular responses, and is relevant for the pathogenesis of hypertension. However, there is no report demonstrating the role of the MePD histaminergic activity on the cardiovascular function in awake rats. The aims of the present work were: 1) to study the effects of two doses (10-100 nM) of HA microinjected in the MePD on basal cardiovascular recordings and on baroreflex- and chemoreflex-mediated responses; 2) to reveal whether cardiovascular reflex responses could be affected by MePD microinjections of (R)-alpha-methylhistamine (AH3), an agonist of the inhibitory autoreceptor H3; and, 3) to carry out a power spectral analysis to evaluate the contribution of the sympathetic and parasympathetic components in the variability of the HR and BP recordings. When compared with the control group (microinjected with saline, 0.3 microl), HA (10 nM) promoted an increase in the MAP50, i.e. the mean value of BP at half of the HR range evoked by the baroreflex response. Histamine (100 nM) did not affect the baroreflex activity, but significantly decreased the parasympathetic component of the HR variability, increased the sympathetic/parasympathetic balance at basal conditions (these two latter evaluated by the power spectral analysis), and promoted an impairment in the chemoreflex bradycardic response. Microinjection of AH3 (10 microM) led to mixed results, which resembled the effects of both doses of HA employed here. Present data suggest that cardiovascular changes induced by baroreceptors and chemoreceptors involve the histaminergic activity in the MePD. This neural regulation of reflex cardiovascular responses can have important implications for homeostatic and allostatic conditions and possibly for the behavioral displays modulated by the rat MePD.
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Affiliation(s)
- E Quagliotto
- Department of Physiological Sciences, Universidade Federal de Ciências da Saúde de Porto Alegre, R. Sarmento Leite 245, Porto Alegre 90170-050 RS, Brazil
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Lu L, Shimizu T, Nakamura K, Yokotani K. Brain neuronal/inducible nitric oxide synthases and cyclooxygenase-1 are involved in the bombesin-induced activation of central adrenomedullary outflow in rats. Eur J Pharmacol 2008; 590:177-84. [DOI: 10.1016/j.ejphar.2008.06.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2008] [Revised: 05/29/2008] [Accepted: 06/12/2008] [Indexed: 01/08/2023]
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Arai J, Okada S, Yamaguchi-shima N, Shimizu T, Sasaki T, Yorimitsu M, Wakiguchi H, Yokotani K. ROLE OF BRAIN PROSTANOIDS IN GLUCAGON-LIKE PEPTIDE-1-INDUCED CENTRAL ACTIVATION OF SYMPATHO-ADRENOMEDULLARY OUTFLOW IN RATS. Clin Exp Pharmacol Physiol 2008; 35:965-70. [DOI: 10.1111/j.1440-1681.2008.04957.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Sasaki T, Shimizu T, Wakiguchi H, Yokotani K. Centrally administered neuromedin U elevates plasma adrenaline by brain prostanoid TP receptor-mediated mechanisms in rats. Eur J Pharmacol 2008; 592:81-6. [PMID: 18647601 DOI: 10.1016/j.ejphar.2008.07.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 06/23/2008] [Accepted: 07/05/2008] [Indexed: 11/19/2022]
Abstract
Neuromedin U is a hypothalamic peptide involved in energy homeostasis and stress responses. The peptide, when administered intracerebroventricularly (i.c.v.), decreases food intake and body weight while increasing body temperature and heat production. We examined the effect of i.c.v. administered neuromedin U on plasma catecholamines with regard to the brain prostanoid using anesthetized rats. Neuromedin U (0.1, 0.5 and 1 nmol/animal, i.c.v.) effectively elevated plasma adrenaline (a maximal response was obtained at 0.5 nmol/animal), but had little effect on plasma noradrenaline. However, intravenously administered neuromedin U (0.5 nmol/animal) had no effect on plasma catecholamines. Neuromedin U (0.5 nmol/animal, i.c.v.)-induced elevation of plasma adrenaline was effectively reduced by intracerebroventricular pretreatments with indomethacin (an inhibitor of cyclooxygenase) (0.6 and 1.2 micromol/animal), furegrelate (an inhibitor of thromboxane A2 synthase) (0.9 and 1.8 micromol/animal) and (+)-S-145 (a blocker of prostanoid TP receptors) (250 and 625 nmol/animal), respectively. The neuromedin U-induced adrenaline response was also abolished by acute bilateral adrenalectomy. These results suggest that centrally administered neuromedin U evokes the secretion of adrenaline from the adrenal medulla by brain prostanoid TP receptor-mediated mechanisms in rats.
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Affiliation(s)
- Tsuyoshi Sasaki
- Department of Pharmacology, School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan
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Okada S, Yamaguchi-Shima N, Shimizu T, Arai J, Yorimitsu M, Yokotani K. Centrally administered N-methyl-d-aspartate evokes the adrenal secretion of noradrenaline and adrenaline by brain thromboxane A2-mediated mechanisms in rats. Eur J Pharmacol 2008; 586:145-50. [PMID: 18374330 DOI: 10.1016/j.ejphar.2008.02.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2007] [Revised: 02/07/2008] [Accepted: 02/25/2008] [Indexed: 11/16/2022]
Abstract
Plasma adrenaline mainly originated from adrenaline-containing cells in the adrenal medulla, while plasma noradrenaline reflects the release from sympathetic nerves in addition to the secretion from noradrenaline-containing cells in the adrenal medulla. The present study was undertaken to characterize the source of plasma catecholamines induced by centrally administered N-methyl-d-aspartate with regard to the brain prostanoid, using urethane-anesthetized rats. Intracerebroventricularly (i.c.v.) administered N-methyl-d-aspartate (1.0, 5.0, 10.0 nmol/animal) dose-dependently elevated plasma levels of noradrenaline and adrenaline. The N-methyl-d-aspartate (5.0 nmol/animal, i.c.v.)-induced elevation of both catecholamines was reduced by dizocilpine maleate (5 nmol/animal, i.c.v.), a non-competitive N-methyl-d-aspartate receptor antagonist. Indomethacin (0.6 and 1.2 micromol/animal, i.c.v.), an inhibitor of cyclooxygenase, dose-dependently reduced the N-methyl-d-aspartate (5.0 nmol/animal, i.c.v.)-induced elevation of both catecholamines. The N-methyl-d-aspartate-induced response was dose-dependently attenuated by furegrelate (0.9 and 1.8 micromol/animal, i.c.v.), an inhibitor of thromboxane A2 synthase. Furthermore, the acute bilateral adrenalectomy abolished the N-methyl-d-aspartate-induced responses, indicating that the source of increase in plasma noradrenaline evoked by N-methyl-d-aspartate is due to secretion from the adrenal gland and not due to release from sympathetic nerve terminals. These results suggest that centrally administered N-methyl-d-aspartate induces the secretion of noradrenaline and adrenaline from adrenal medulla by the brain thromboxane A2-mediated mechanisms in rats.
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Affiliation(s)
- Shoshiro Okada
- Department of Pharmacology: Graduate School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan.
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Shimizu T, Yamaguchi N, Okada S, Lu L, Sasaki T, Yokotani K. Roles of brain phosphatidylinositol-specific phospholipase C and diacylglycerol lipase in centrally administered histamine-induced adrenomedullary outflow in rats. Eur J Pharmacol 2007; 571:138-44. [PMID: 17628524 DOI: 10.1016/j.ejphar.2007.05.061] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2007] [Revised: 05/23/2007] [Accepted: 05/24/2007] [Indexed: 02/02/2023]
Abstract
Recently, we reported that intracerebroventricularly (i.c.v.) administered histamine evokes the secretion of noradrenaline and adrenaline from adrenal medulla by brain cyclooxygenase-1- and thromboxane A2-mediated mechanisms in rats. These results suggest the involvement of brain arachidonic acid cascade in the histamine-induced activation of the central adrenomedullary outflow. Arachidonic acid is released mainly by phospholipase A2 (PLA2)-dependent pathway or phospholipase C (PLC)/diacylglycerol lipase-dependent pathway. In the present study, histamine (27 nmol/animal, i.c.v.) -induced elevation of plasma noradrenaline and adrenaline was dose-dependently reduced by U-73122 (PLC inhibitor) (10 and 100 nmol/animal, i.c.v.), ET-18-OCH3 (phosphatidylinositol-specific PLC inhibitor) (10 and 30 nmol/animal, i.c.v.) and RHC-80267 (diacylglycerol lipase inhibitor) (1.3 and 2.6 micromol/animal, i.c.v.). However, mepacrine (PLA2 inhibitor) (1.1 and 2.2 micromol/animal, i.c.v.) and D609 (phosphatidylcholine-specific PLC inhibitor) (30, 100 and 300 nmol/animal, i.c.v.) had no effect. These results suggest the involvement of brain phosphatidylinositol-specific PLC and diacylglycerol lipase in the centrally administered histamine-induced activation of the adrenomedullary outflow in rats.
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Affiliation(s)
- Takahiro Shimizu
- Department of Pharmacology, Graduate School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan
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Yamaguchi-Shima N, Okada S, Shimizu T, Usui D, Nakamura K, Lu L, Yokotani K. Adrenal adrenaline- and noradrenaline-containing cells and celiac sympathetic ganglia are differentially controlled by centrally administered corticotropin-releasing factor and arginine-vasopressin in rats. Eur J Pharmacol 2007; 564:94-102. [PMID: 17350615 DOI: 10.1016/j.ejphar.2007.02.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2006] [Revised: 02/01/2007] [Accepted: 02/01/2007] [Indexed: 11/16/2022]
Abstract
The adrenal glands and sympathetic celiac ganglia are innervated mainly by the greater splanchnic nerves, which contain preganglionic sympathetic nerves that originated from the thoracic spinal cord. The adrenal medulla has two separate populations of chromaffin cells, adrenaline-containing cells (A-cells) and noradrenaline-containing cells (NA-cells), which have been shown to be differentially innervated by separate groups of the preganglionic sympathetic neurons. The present study was designed to characterize the centrally activating mechanisms of the adrenal A-cells, NA-cells and celiac sympathetic ganglia with expression of cFos (a marker for neural excitation), in regard to the brain prostanoids, in anesthetized rats. Intracerebroventricularly (i.c.v.) administered corticotropin-releasing factor (CRF) induced cFos expression in the adrenal A-cells, but not NA-cells, and celiac ganglia. On the other hand, i.c.v. administered arginine-vasopressin (AVP) resulted in cFos induction in both A-cells and NA-cells in the adrenal medulla, but not in the celiac ganglia. Intracerebroventricular pretreatment with indomethacin (an inhibitor of cyclooxygenase) abolished the CRF- and AVP-induced cFos expression in all regions described above. On the other hand, intracerebroventricular pretreatment with furegrelate (an inhibitor of thromboxane A2 synthase) abolished the CRF-induced cFos expression in the adrenal A-cells, but not in the celiac ganglia, and also abolished the AVP-induced cFos expression in both A-cells and NA-cells in the adrenal medulla. These results suggest that centrally administered CRF activates adrenal A-cells and celiac sympathetic ganglia by brain thromboxane A2-mediated and other prostanoid than thromboxane A2 (probably prostaglandin E2)-mediated mechanisms, respectively. On the other hand, centrally administered AVP activates adrenal A-cells and NA-cells by brain thromboxane A2-mediated mechanisms in rats.
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Affiliation(s)
- Naoko Yamaguchi-Shima
- Department of Pharmacology, Graduate School of Medicine, Kochi University, Nankoku, Kochi 783-8505, Japan.
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