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Skurikhin E, Pershina O, Zhukova M, Widera D, Pan E, Pakhomova A, Krupin V, Ermakova N, Skurikhina V, Sandrikina L, Morozov S, Kubatiev A, Dygai A. Spiperone Stimulates Regeneration in Pulmonary Endothelium Damaged by Cigarette Smoke and Lipopolysaccharide. Int J Chron Obstruct Pulmon Dis 2022; 16:3575-3591. [PMID: 35002229 PMCID: PMC8722540 DOI: 10.2147/copd.s336410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 12/06/2021] [Indexed: 12/30/2022] Open
Abstract
Background Endothelial dysfunction and destruction of the pulmonary microcirculation are important pathogenic factors in chronic obstructive pulmonary disease (COPD). In COPD, bronchial obstruction is associated with endothelial dysfunction. Thus, new pharmacological treatment options aimed at restoring the pulmonary endothelium represent a clinical need in COPD therapy. Notch1 has been shown to protect cells against apoptosis, inflammation, and oxidative stress caused by cigarette smoke extract (CSE). Therefore, drug which effect on Notch1 may be a potential therapeutic target for COPD in the future. Methods In this study, we assessed the potential of spiperone to mediate regeneration of pulmonary endothelium in model of pulmonary emphysema induced by a CSE and lipopolysaccharide (LPS) in female C57BL/6 mice. Results Spiperone increased the number of capillaries as well as the expression of the CD31 in the alveolar tissue compared to the controls. Moreover, application of spiperone prevented alveolar wall destruction (DI), and reduced the area of emphysema. Lastly, we demonstrated that spiperone positively influenced mobilization and migration of endothelial progenitor cells (EPC, CD45−CD34+CD31+), CD309+-endothelial cells, and angiogenesis precursors (CD45−CD117+CD309+) into the lung. Spiperone administration significantly reduced the number Notch1 positive CD309+-endothelial cells and Notch1+ EPCs. Conclusion Overall, our results suggest that spiperone mediates endothelial regeneration in an animal model of COPD. Thus, it could represent a novel therapeutic approach for treatment of emphysema associated with COPD.
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Affiliation(s)
- Evgenii Skurikhin
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Olga Pershina
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Mariia Zhukova
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Darius Widera
- Stem Cell Biology and Regenerative Medicine Group, School of Pharmacy, University of Reading, Whiteknights Campus, Reading, RG6 6AP, UK
| | - Edgar Pan
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Angelina Pakhomova
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Vyacheslav Krupin
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Natalia Ermakova
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | | | - Lubov Sandrikina
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia
| | - Sergey Morozov
- Institute of General Pathology and Pathophysiology, Moscow, Russia
| | - Aslan Kubatiev
- Institute of General Pathology and Pathophysiology, Moscow, Russia
| | - Alexander Dygai
- Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Centre of the Russian Academy of Sciences, Tomsk, Russia.,Institute of General Pathology and Pathophysiology, Moscow, Russia
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Skurikhin E, Madonov P, Pershina O, Ermakova N, Pakhomova A, Widera D, Pan E, Zhukova M, Sandrikina L, Artamonov A, Dygai A. Micellar Hyaluronidase and Spiperone as a Potential Treatment for Pulmonary Fibrosis. Int J Mol Sci 2021; 22:ijms22115599. [PMID: 34070506 PMCID: PMC8198946 DOI: 10.3390/ijms22115599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/21/2021] [Accepted: 05/24/2021] [Indexed: 12/18/2022] Open
Abstract
Concentration of hyaluronic acid (HA) in the lungs increases in idiopathic pulmonary fibrosis (IPF). HA is involved in the organization of fibrin, fibronectin, and collagen. HA has been proposed to be a biomarker of fibrosis and a potential target for antifibrotic therapy. Hyaluronidase (HD) breaks down HA into fragments, but is a subject of rapid hydrolysis. A conjugate of poloxamer hyaluronidase (pHD) was prepared using protein immobilization with ionizing radiation. In a model of bleomycin-induced pulmonary fibrosis, pHD decreased the level of tissue IL-1β and TGF-β, prevented the infiltration of the lung parenchyma by CD16+ cells, and reduced perivascular and peribronchial inflammation. Simultaneously, a decrease in the concentrations of HA, hydroxyproline, collagen 1, total soluble collagen, and the area of connective tissue in the lungs was observed. The effects of pHD were significantly stronger compared to native HD which can be attributed to the higher stability of pHD. Additional spiperone administration increased the anti-inflammatory and antifibrotic effects of pHD and accelerated the regeneration of the damaged lung. The potentiating effects of spiperone can be explained by the disruption of the dopamine-induced mobilization and migration of fibroblast progenitor cells into the lungs and differentiation of lung mesenchymal stem cells (MSC) into cells of stromal lines. Thus, a combination of pHD and spiperone may represent a promising approach for the treatment of IPF and lung regeneration.
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Affiliation(s)
- Evgenii Skurikhin
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
- Correspondence: ; Tel.: +7-3822-418-375
| | - Pavel Madonov
- Limited Liability Company «Scientific Future Management», 630559 Novosibirsk, Russia; (P.M.); (A.A.)
| | - Olga Pershina
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Natalia Ermakova
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Angelina Pakhomova
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Darius Widera
- Stem Cell Biology and Regenerative Medicine Group, Whiteknights Campus, School of Pharmacy, University of Reading, Reading RG6 6AP, UK;
| | - Edgar Pan
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Mariia Zhukova
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Lubov Sandrikina
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
| | - Andrey Artamonov
- Limited Liability Company «Scientific Future Management», 630559 Novosibirsk, Russia; (P.M.); (A.A.)
| | - Alexander Dygai
- Tomsk National Research Medical Centre of the Russian Academy of Sciences, Laboratory of Regenerative Pharmacology, Goldberg ED Research Institute of Pharmacology and Regenerative Medicine, Lenin, 3, 634028 Tomsk, Russia; (O.P.); (N.E.); (A.P.); (E.P.); (M.Z.); (L.S.); (A.D.)
- Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia
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Skurikhin EG, Krupin VA, Pershina OV, Pan ES, Pakhomova AV, Sandrikina LA, Ermakova NN, Vaizova OE, Zhukova MA, Dygai AM. Blockade of Dopamine D2 Receptors as a Novel Approach to Stimulation of Notch1 + Endothelial Progenitor Cells and Angiogenesis in C57BL/6 Mice with Pulmonary Emphysema Induced by Proteases and Deficiency of α1-Antitrypsin. Bull Exp Biol Med 2020; 168:718-723. [PMID: 32328949 DOI: 10.1007/s10517-020-04787-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Indexed: 11/24/2022]
Abstract
We studied the effects of spiperone, a selective blocker of dopamine D2 receptors, on the model of pulmonary emphysema provoked by administration of elastase and D-galactosamine hydrochloride to female C57BL/6 mice and characterized by activation of proteases in the lungs and systemic deficiency of its inhibitor α1-antitrypsin. In this model, spiperone prevented the development of inflammatory reaction and reduced the area of emphysematous expanded alveolar tissue. The expression of angiogenic marker CD31 in the lungs increased under these conditions. Regeneration of the damaged microvascular bed under the action of spiperone resulted from recruiting of Notch1+ endothelial progenitor cells (CD45-CD31+CD34+) into the lungs and blockade of the inhibitory effect of dopamine on phosphorylation of VEGF-2 receptors in endothelial cells of different maturity. In addition, spiperone produced a protective effect on hepatocytes and restored the production and secretion of α1-antitrypsin by these cells.
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Affiliation(s)
- E G Skurikhin
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia.
| | - V A Krupin
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - O V Pershina
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - E S Pan
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - A V Pakhomova
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - L A Sandrikina
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - N N Ermakova
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
| | - O E Vaizova
- Department of Pharmacology, Siberian State Medical University, Ministry of Health of the Russian Federation, Tomsk, Russia
| | - M A Zhukova
- Department of Pharmacology, Siberian State Medical University, Ministry of Health of the Russian Federation, Tomsk, Russia
| | - A M Dygai
- Laboratory of Regenerative Pharmacology, E. D. Goldberg Research Institute of Pharmacology and Regenerative Medicine, Tomsk National Research Medical Center, Russian Academy of Sciences, Moscow, Russia
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French AN, Ashby RS, Morgan IG, Rose KA. Time outdoors and the prevention of myopia. Exp Eye Res 2013; 114:58-68. [PMID: 23644222 DOI: 10.1016/j.exer.2013.04.018] [Citation(s) in RCA: 210] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/20/2013] [Accepted: 04/23/2013] [Indexed: 10/26/2022]
Abstract
Recent epidemiological evidence suggests that children who spend more time outdoors are less likely to be, or to become myopic, irrespective of how much near work they do, or whether their parents are myopic. It is currently uncertain if time outdoors also blocks progression of myopia. It has been suggested that the mechanism of the protective effect of time outdoors involves light-stimulated release of dopamine from the retina, since increased dopamine release appears to inhibit increased axial elongation, which is the structural basis of myopia. This hypothesis has been supported by animal experiments which have replicated the protective effects of bright light against the development of myopia under laboratory conditions, and have shown that the effect is, at least in part, mediated by dopamine, since the D2-dopamine antagonist spiperone reduces the protective effect. There are some inconsistencies in the evidence, most notably the limited inhibition by bright light under laboratory conditions of lens-induced myopia in monkeys, but other proposed mechanisms possibly associated with time outdoors such as relaxed accommodation, more uniform dioptric space, increased pupil constriction, exposure to UV light, changes in the spectral composition of visible light, or increased physical activity have little epidemiological or experimental support. Irrespective of the mechanisms involved, clinical trials are now underway to reduce the development of myopia in children by increasing the amount of time they spend outdoors. These trials would benefit from more precise definition of thresholds for protection in terms of intensity and duration of light exposures. These can be investigated in animal experiments in appropriate models, and can also be determined in epidemiological studies, although more precise measurement of exposures than those currently provided by questionnaires is desirable.
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Affiliation(s)
- Amanda N French
- Discipline of Orthoptics, Faculty of Health Sciences, University of Sydney, Lidcombe, NSW 2011, Australia
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Centurión D, Ortiz MI, Saxena PR, Villalón CM. The atypical 5-HT2 receptor mediating tachycardia in pithed rats: pharmacological correlation with the 5-HT2A receptor subtype. Br J Pharmacol 2002; 135:1531-9. [PMID: 11906967 PMCID: PMC1573258 DOI: 10.1038/sj.bjp.0704593] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. In pithed rats, 5-HT mediates tachycardia both directly (by 5-HT(2) receptors) and indirectly (by a tyramine-like effect). The receptor mediating tachycardia directly has been classified as an 'atypical' 5-HT(2) receptor since it was 'weakly' blocked by ketanserin. Moreover, 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI), a 5-HT(2) agonist, failed to mimic 5-HT-induced tachycardia. Since 5-HT(2) receptors consist of 5-HT(2A), 5-HT(2B) and 5-HT(2C) subtypes, this study investigated if these subtypes mediate the above response. 2. In pithed rats, intraperitoneally (i.p.) pre-treated with reserpine (5 mg kg(-1)), intravenous (i.v.) administration of 5-HT, 5-methoxytryptamine (5-MeO-T), 1-(3-chlorophenyl) piperazine (mCPP) and 5-carboxamidotryptamine (5-CT) (10, 30, 100 and 300 microg kg(-1) each), produced dose-dependent tachycardic responses. Interestingly, DOI (10 - 1000 microg kg(-1), i.v.) induced only slight, dose-unrelated, tachycardic responses, whilst the 5-HT(2C) agonist, Ro 60-0175 (10 - 1000 microg kg(-1), i.v.), produced a slight tachycardia only at 300 and 1000 microg kg(-1). In contrast, sumatriptan and 1-(m-trifluoromethylphenyl)- piperazine (TFMPP) were inactive. The rank order of potency was: 5-HT > or =5-MeO-T> mCPP > or =5-CT > or =DOI > Ro 60-0175. 3. The tachycardic responses to 5-HT, which remained unaffected after i.v. saline (0.3 and 1 ml kg(-1)) or propranolol (3 mg kg(-1)), were selectively blocked by the 5-HT(2A) antagonists ketanserin (30 and 100 microg kg(-1)) or spiperone (10 and 30 microg kg(-1)) as well as by the non-selective 5-HT(2) antagonists, ritanserin (10 and 30 microg kg(-1)) or mesulergine (100 microg kg(-1)). Remarkably, these responses were unaffected by the antagonists rauwolscine (5-HT(2B)), SB204741 (5-HT(2B/2C)) or Ro 04-6790 (5-ht(6)) (300 and 1000 microg kg(-1) each). 4. These results suggest that the 'atypical' 5-HT(2) receptors mediating tachycardia in reserpinized pithed rats are pharmacologically similar to the 5-HT(2A) receptor subtype.
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Affiliation(s)
- David Centurión
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
| | - Mario I Ortiz
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
| | - Pramod R Saxena
- Department of Pharmacology, Faculty of Medicine and Health Sciences, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands
| | - Carlos M Villalón
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
- Author for correspondence:
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Abstract
The effects of injections i.c.v. of alpha-methyl-5-(2-thienylmethoxy)-1H-indole-3-ethanamine (BW723C86; 0.02 - 2 micromol kg(-1)), a 5-HT(2B) receptor agonist, on renal sympathetic and phrenic nerve activity, mean arterial blood pressure and heart rate were investigated in alpha-chloralose anaesthetized rats pretreated with a peripherally acting 5-HT(2) receptor antagonist. BW723C86 i.c.v. caused a dose-related increase in renal nerve activity reaching a maximum of 67+/-6%, which at the highest dose was associated with a small and maintained fall in mean arterial blood pressure of 7+/-3 mmHg. These changes were not associated with any significant changes in heart rate or phrenic nerve activity. BW723C86-evoked increases in renal nerve activity and hypotension were attenuated by pretreatment (i.c.v.) with SB204741 (300 nmol kg(-1); a 5-HT(2B) receptor antagonist) but not by the same dose (i.c.v.) of ketanserin (a 5-HT(2A) receptor antagonist) or RS102221 (a 5-HT(2C) receptor antagonist). None of these antagonists alone had any effect on the variables being measured. It is concluded that central 5-HT(2B) receptors may play a selective role in the control of sympathetic supply to the kidney, which could be important in the central mechanisms involved in blood volume regulation. British Journal of Pharmacology (2000) 129, 177 - 183
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Affiliation(s)
- I D Knowles
- Department of Pharmacology, University College London, Royal Free Campus, Rowland Hill Street, Hampstead, London, UK
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Knowles ID, Ramage AG. Evidence for a role for central 5-HT2B as well as 5-HT2A receptors in cardiovascular regulation in anaesthetized rats. Br J Pharmacol 1999; 128:530-42. [PMID: 10516629 PMCID: PMC1571665 DOI: 10.1038/sj.bjp.0702822] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/1999] [Revised: 06/23/1999] [Accepted: 07/09/1999] [Indexed: 11/09/2022] Open
Abstract
1. The effects of injections i.c.v. of quipazine, (2 micromol kg-1) and 1-(2,5-di-methoxy-4-iodophenyl)-2-aminopropane (DOI; 2 micromol kg-1) on renal sympathetic and phrenic nerve activity, mean arterial blood pressure (MAP) and heart rate were investigated in alpha-chloralose anaesthetized rats pretreated with a peripherally acting 5-HT2 receptor antagonist. 2. Quipazine or DOI caused a rise in MAP which was associated with a tachycardia and renal sympathoinhibition in rats pretreated (i.c.v.) with the antagonist vehicle 10% PEG. These effects of quipazine were completely blocked by pretreatment with cinanserin (a 5-HT2 receptor antagonist) and attenuated by spiperone (a 5-HT2A receptor antagonist). However, pretreatment with SB200646A (a 5-HT2B/2C receptor antagonist) only blocked the sympathoinhibition, while pretreatment with SB204741 (a 5-HT2B receptor antagonist) reversed the sympathoinhibition to excitation as it also did for DOI. Quipazine also caused renal sympathoexcitation in the presence (i.v.) of a vasopressin V1 receptor antagonist. 3. Injection (i.v.) of the V1 receptor antagonist at the peak pressor response evoked by quipazine alone and in the presence of SB204741 caused an immediate fall in MAP. For quipazine alone the renal sympathoinhibition was slowly reversed to an excitation, while the renal sympathoexcitation observed in the presence of SB204741 was potentiated. In both, the quipazine-evoked tachycardia was unaffected. 4. The data indicate that cardiovascular responses caused by i.c.v. quipazine and DOI are primarily due to activation of central 5-HT2A receptors, which causes the release of vasopressin and a tachycardia. This released vasopressin appears to suppress a 5-HT2A receptor-evoked central increase in sympathetic outflow, which involves the activation of central 5-HT2B receptors indirectly by the released vasopressin.
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Affiliation(s)
- Ian D Knowles
- Department of Pharmacology, University College London, Royal Free Campus, Rowland Hill Street, Hampstead, London NW3 2PF
| | - Andrew G Ramage
- Department of Pharmacology, University College London, Royal Free Campus, Rowland Hill Street, Hampstead, London NW3 2PF
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Perlmutter JS, Stambuk MK, Markham J, Black KJ, McGee-Minnich L, Jankovic J, Moerlein SM. Decreased [18F] spiperone binding in putamen in idiopathic focal dystonia. J Neurosci 1997; 17:843-50. [PMID: 8987805 PMCID: PMC6573223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/1996] [Revised: 10/15/1996] [Accepted: 11/05/1996] [Indexed: 02/03/2023] Open
Abstract
In this study we have investigated the pathophysiology of two idiopathic focal dystonias: hand cramp with excessive cocontractions of agonist and antagonist hand or forearm muscles during specific tasks, such as writing, and facial dystonia manifested by involuntary eyelid spasms (blepharospasm) and lower facial and jaw spasms (oromandibular dystonia). We used positron emission tomography (PET) to measure the in vivo binding of the dopaminergic radioligand [18F]spiperone in putamen in 21 patients with these two focal dystonias and compared the findings with those from 13 normals. We measured regional cerebral blood flow and blood volume in each subject as well as the radiolabeled metabolites of [18F]spiperone in arterial blood. A stereotactic method of localization, independent of the appearance of the images, was used to identify the putamen in all of the PET images. We analyzed the PET and arterial blood data with a validated nonsteady-state tracer kinetic model representing the in vivo behavior of the radioligand. An index of binding called the combined forward rate constant was decreased by 29% in dystonics, as compared with normals (p < 0.05). There were no significant differences between dystonics and normals in regional blood flow, blood volume, nonspecific binding, permeability-surface area product of [18F]spiperone or the dissociation rate constant. These findings are consistent with a decrease of dopamine D2-like binding in putamen and are the first demonstration of a receptor abnormality in idiopathic dystonia. These results have important implications for the pathophysiology of dystonia as well as for function of the basal ganglia.
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Affiliation(s)
- J S Perlmutter
- Department of Neurology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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