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Lee YJ, Kim HM, Jang YN, Han YM, Seo HS, Jung TW, Jeong JH, Lee HJ, Jung KO. Buspirone Induces Weight Loss and Normalization of Blood Pressure via the Stimulation of PPAR δ Dependent Energy Producing Pathway in Spontaneously Hypertensive Rats. PPAR Res 2023; 2023:7550164. [PMID: 37168052 PMCID: PMC10164918 DOI: 10.1155/2023/7550164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 04/07/2023] [Accepted: 04/13/2023] [Indexed: 05/13/2023] Open
Abstract
Introduction Buspirone, as a partial agonist for a 5-hydroxytryptamine (serotonin) receptor 1A (5-HT1A), has been prescribed as an anxiolytic drug for patients. In addition, the lowering effect of serotonin on blood pressure was reported in hypertensive animal model. We investigated the therapeutic mechanism of buspirone against lipid metabolism disturbed by hypertension of early stage via hypertensive and obese animal model. Methods The levels of various biomarkers related to lipid metabolism and hypertension were estimated through the measurement of body weight and fat weight, blood analysis, western blotting, immunohistochemistry, and staining methods. Results The lipid accumulation was lowered in differentiated 3T3-L1 cells by buspirone treatments of 50 and 100 μM compared with untreated differentiated control. Body weight and abdominal fat weight were lowered in spontaneously hypertensive rats (SHRs) administered with buspirone of 10 mg/kg/day for 4 weeks than 8-week untreated group. Triglyceride (TG) level was decreased in SHRs administered with buspirone of 5 and 10 mg/kg/day compared to 8-week untreated group. High-density lipoprotein (HDL)-cholesterol concentration was elevated by buspirone 10 mg/kg/day treatment compared to 8-week untreated group. Blood pressures in SHRs were lowered by buspirone treatments of 5 and 10 mg/kg/day compared with 8-week untreated group. Protein levels for peroxisome proliferator-activated receptor δ (PPARδ), 5' adenosine monophosphate-activated protein kinase (AMPK), and PPARγ coactivator-1 alpha (PGC-1α) were increased both in C2C12 cells treated by buspirone of 100 μM and in SHRs administered by buspirone of 1, 5, and 10 mg/kg/day compared to untreated control cells and 8-week untreated group. Fat cell numbers decreased in 8-week untreated group were increased in SHRs administered by buspirone treats of 1, 5, and 10 mg/kg/day. Protein expression levels for angiotensin II type 1 receptor (AT1R) and vascular cell adhesion molecule 1 (VCAM1) were increased in 8-week untreated group compared to 4-week group, however, they were decreased by buspirone treatments of 1, 5, and 10 mg/kg/day. Conclusion Buspirone may induce the losses of body weight and abdominal fat weight through the activation of PPARδ dependent catabolic metabolism producing energy, and eventually, the ameliorated lipid metabolism could normalize high blood pressure.
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Affiliation(s)
- Yong-Jik Lee
- Cardiovascular Center, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
- Department of Anatomy, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Hyun-Min Kim
- Cardiovascular Center, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
- Department of Medical Science, BK21 Plus KUMS Graduate Program, Korea University College of Medicine, Seoul, Republic of Korea
| | - Yoo-Na Jang
- Cardiovascular Center, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
- Department of Medicine, College of Medicine, Graduate School, Chung-Ang University, Seoul, Republic of Korea
| | - Yoon-Mi Han
- Cardiovascular Center, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
| | - Hong Seog Seo
- Cardiovascular Center, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
| | - Tae Woo Jung
- Department of Pharmacology, Chung-Ang University College of Medicine, Seoul, Republic of Korea
| | - Ji Hoon Jeong
- Department of Pharmacology, Chung-Ang University College of Medicine, Seoul, Republic of Korea
- Department of Global Innovative Drugs, Graduate School of Chung-Ang University, Seoul, Republic of Korea
| | - Hyun Jung Lee
- Department of Anatomy, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Kyung Oh Jung
- Department of Anatomy, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
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Shin C, Ko YH, Shim SH, Kim JS, Na KS, Hahn SW, Lee SH. Efficacy of Buspirone Augmentation of Escitalopram in Patients with Major Depressive Disorder with and without Atypical Features: A Randomized, 8 Week, Multicenter, Open-Label Clinical Trial. Psychiatry Investig 2020; 17:796-803. [PMID: 32750760 PMCID: PMC7449841 DOI: 10.30773/pi.2020.0017] [Citation(s) in RCA: 2] [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: 01/15/2020] [Accepted: 06/02/2020] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVE This study investigated the treatment response and cognitive enhancement effects of buspirone augmentation of escitalopram in patients with major depressive disorder (MDD), according to atypical feature subtypes of MDD. METHODS An 8 week, randomized, parallel-controlled, open-label study was conducted. The Columbia Atypical Depression Diagnostic Scale was administered to evaluate atypical features. Patients were assigned randomly to the buspirone augmentation or non-buspirone groups. Symptom severity and cognitive function were evaluated using the 17-item Hamilton Depression Rating Scale, Hamilton Anxiety Rating Scale, Beck Depression Inventory, Beck Anxiety Inventory, digit span test, word fluency test, and Trail Making Tests A and B. RESULTS A total of 89 patients were recruited. There were no significant differences in the measures between the groups; however, among the MDD patients without atypical features, the digit span and word fluency tests were improved by treatment. In the MDD patients without atypical features, the buspirone augmentation group showed a significant improvement on the digit span test compared to the non-buspirone group. CONCLUSION Buspirone augmentation did not demonstrate significant benefits in MDD patients; however, buspirone augmentation showed greater efficacy for the improvement of cognitive function in MDD patients without atypical features. Our study suggests that atypical features are an important factor for cognitive enhancement in buspirone augmentation treatment in patients with MDD.
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Affiliation(s)
- Cheolmin Shin
- Department of Psychiatry, Korea University College of Medicine, Korea University Ansan Hospital, Ansan, Republic of Korea
| | - Young-Hoon Ko
- Department of Psychiatry, Korea University College of Medicine, Korea University Ansan Hospital, Ansan, Republic of Korea
| | - Se-Hoon Shim
- Department of Psychiatry, Soonchunhyang University College of Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Republic of Korea
| | - Ji Sun Kim
- Department of Psychiatry, Soonchunhyang University College of Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Republic of Korea
| | - Kyoung-Sae Na
- Department of Psychiatry, Gachon University College of Medicine, Gil Medical Center, Incheon, Republic of Korea
| | - Sang-Woo Hahn
- Department of Psychiatry, Soonchunhyang University College of Medicine, Soonchunhyang University Hospital, Seoul, Republic of Korea
| | - Seung-Hwan Lee
- Department of Psychiatry, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea.,Clinical Emotion and Cognition Research Laboratory, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea
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Serotonergic treatment normalizes midbrain dopaminergic neuron increase after periaqueductal gray stimulation. Brain Struct Funct 2020; 225:1957-1966. [PMID: 32594260 DOI: 10.1007/s00429-020-02102-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 06/15/2020] [Indexed: 12/23/2022]
Abstract
Electrical stimulation of the dorsolateral periaqueductal gray (dlPAG) in rats has been shown to elicit panic-like behaviour and can be a useful as an unconditioned stimulus for modelling anticipatory fear and agoraphobia in a contextual fear conditioning paradigm. In this study, we further analysed our previous data on the effects of escitalopram (a selective serotonin reuptake inhibitor, SSRI) and buspirone (a 5-HT1A receptor partial agonist) on dlPAG-induced anticipatory fear behaviour in a rat model using freezing as a measure. We then attempted to unravel some of the interactions with dopamine signalling using tyrosine hydroxylase (TH) immunohistochemistry to probe the effects on dopaminergic neurons. We showed that acute treatment of escitalopram, but not buspirone, was effective in reducing anticipatory freezing behaviour, while chronic administrations of both drugs were effective. We found that the dlPAG stimulation induced increase number of dopaminergic neurons in the ventral tegmental area (VTA) which was reversed in both chronic buspirone and escitalopram groups. We further found a strong positive correlation between the number of dopaminergic neurons and freezing in the VTA and showed positive correlations between dopaminergic neurons in the VTA and substantia nigra pars compacta (SNpc) in escitalopram and buspirone groups, respectively. Overall, we showed that chronic treatment with an SSRI and a 5-HT1A agonist reduced anticipatory freezing behaviour which seems to be associated, through correlative studies, with a reversal of dlPAG stimulation induced increase in number of dopaminergic neurons in the VTA and/or SNpc.
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Conserved Serotonergic Background of Experience-Dependent Behavioral Responsiveness in Zebrafish ( Danio rerio). J Neurosci 2020; 40:4551-4564. [PMID: 32350040 DOI: 10.1523/jneurosci.2178-19.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 03/17/2020] [Accepted: 03/20/2020] [Indexed: 01/28/2023] Open
Abstract
Forming effective responses to threatening stimuli requires the adequate and coordinated emergence of stress-related internal states. Such ability depends on early-life experiences and, in connection, the adequate formation of neuromodulatory systems, particularly serotonergic signaling. Here, we assess the serotonergic background of experience-dependent behavioral responsiveness using male and female zebrafish (Danio rerio). For the first time, we have characterized a period during behavioral metamorphosis in which zebrafish are highly reactive to their environment. Absence of social stimuli during this phase established by isolated rearing fundamentally altered the behavioral phenotype of postmetamorphic zebrafish in a challenge-specific manner, partially due to reduced responsiveness and an inability to develop stress-associated arousal state. In line with this, isolation differentially affected whole-brain serotonergic signaling in resting and stress-induced conditions, an effect that was localized in the dorsal pallium and was negatively associated with responsiveness. Administration of the serotonin receptor 1A partial agonist buspirone prevented the isolation-induced serotonin response to novelty in the level of the whole brain and the forebrain as well, without affecting catecholamine levels, and rescued stress-induced arousal along with challenge-induced behaviors, which together indicates functional connection between these changes. In summary, there is a consistent negative association between behavioral responsiveness and serotonergic signaling in zebrafish, which is well recognizable through the modifying effects of developmental perturbation and pharmacological manipulations as well. Our results imply a conserved serotonergic mechanism that context-dependently modulates environmental reactivity and is highly sensitive to experiences acquired during a specific early-life time window, a phenomenon that was previously only suggested in mammals.SIGNIFICANCE STATEMENT The ability to respond to challenges is a fundamental factor in survival. We show that zebrafish that lack appropriate social stimuli in a sensitive developmental period show exacerbated alertness in nonstressful conditions while failing to react adequately to stressors. This shift is reflected inversely by central serotonergic signaling, a system that is implicated in numerous mental disorders in humans. Serotonergic changes in brain regions modulating responsivity and behavioral impairment were both prevented by the pharmacological blockade of serotonergic function. These results imply a serotonergic mechanism in zebrafish that transmits early-life experiences to the later phenotype by shaping stress-dependent behavioral reactivity, a phenomenon that was previously only suggested in mammals. Zebrafish provide new insights into early-life-dependent neuromodulation of behavioral stress-responses.
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Di G, Xu Y. Influences of combined traffic noise on anxiety in mice. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 579:1439-1445. [PMID: 27913020 DOI: 10.1016/j.scitotenv.2016.11.144] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 11/03/2016] [Accepted: 11/20/2016] [Indexed: 06/06/2023]
Abstract
With the rapid development of traffic facilities in China, traffic noise pollution is increasingly prominent. This research aims to explore the influences of combined traffic noise on receptors' anxiety. Institute of cancer research mice were exposed to combined traffic noise (CTN) from highway and high-speed railway for 52days, whose day-night equivalent continuous A-weighted sound pressure level (Ldn) was 70dB(A). The impacts of CTN on anxiety were explored by behavior tests and monoamine neurotransmitter assays. The results were in depth discussed in comparison to two previous studies on the impacts of single high-speed railway noise (HSRN) and aircraft noise (AN), but data from the three studies were not merged and statistically compared. No significant differences were shown in the behavioral indicators and the monoamine levels between the experimental and control groups after CTN exposure, indicating no obvious impacts of 70dB(A) CTN on anxiety in mice were found in this study. When Ldn was approximately 70dB(A), CTN had less obvious impacts on anxiety than HSRN and AN, which is mainly related to that both the acoustical parameters of noise events [maximum noise level (LAmax), noise events duration, slope of rise, difference of LAmax from 1-min background equivalent continuous A-weighted sound pressure level] and modified day-night equivalent continuous R-weighted sound pressure level (considering animal auditory sensitivity to different sound frequencies and circadian rhythms) of CTN are smaller than those of HSRN and AN.
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Affiliation(s)
- Guoqing Di
- Institute of Environmental Pollution & Control Technology, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China.
| | - Yaqian Xu
- Institute of Environmental Pollution & Control Technology, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China.
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Two weeks of buspirone protects against posthypoxic ventilatory pauses in the C57BL/6J mouse strain. Respir Physiol Neurobiol 2012; 183:35-40. [DOI: 10.1016/j.resp.2012.05.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 04/22/2012] [Accepted: 05/02/2012] [Indexed: 11/22/2022]
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Guille V, Gogos A, Nathan PJ, Croft RJ, van den Buuse M. Interaction of estrogen with central serotonergic mechanisms in human sensory processing: loudness dependence of the auditory evoked potential and mismatch negativity. J Psychopharmacol 2011; 25:1614-22. [PMID: 20562170 DOI: 10.1177/0269881110370506] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Estrogen may be involved in schizophrenia by inhibiting serotonin-1A (5-HT(1A)) receptor function. We examined the effects of estrogen pre-treatment on modulation of loudness dependence of the auditory evoked potential (LDAEP) and mismatch negativity by the 5-HT(1A) receptor partial agonist, buspirone. Using a double-blind, placebo-controlled, repeated-measures design in healthy female volunteers, we observed that buspirone treatment significantly increased LDAEP slope. Estrogen increased LDAEP slope on its own, and a further LDAEP increase by buspirone was not seen after estrogen pre-treatment. Similar results were observed for mismatch negativity, where buspirone caused a small increase of latency, although not amplitude, after placebo but not estrogen pre-treatment, which enhanced mismatch negativity latency on its own. These results are in line with our previous findings on prepulse inhibition showing an inhibitory effect of estrogen on the action of buspirone. Taken together, these data suggest that estrogen may inhibit 5-HT(1A) receptor-mediated disruptions of auditory processing.
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Affiliation(s)
- Valérie Guille
- Brain Sciences Institute, Swinburne University of Technology, Hawthorn, VIC, Australia
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Lechin F, van der Dijs B, Pardey-Maldonado B, Rivera JE, Baez S, Lechin ME. Anorexia nervosa depends on adrenal sympathetic hyperactivity: opposite neuroautonomic profile of hyperinsulinism syndrome. Diabetes Metab Syndr Obes 2010; 3:311-7. [PMID: 21437100 PMCID: PMC3047992 DOI: 10.2147/dmsott.s10744] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE The aim of our study was to determine the central and peripheral autonomic nervous system profiles underlying anorexia nervosa (AN) syndrome, given that affected patients present with the opposite clinical profile to that seen in the hyperinsulinism syndrome. DESIGN We measured blood pressure and heart rate, as well as circulating neurotransmitters (noradrenaline, adrenaline, dopamine, plasma serotonin, and platelet serotonin), using high-performance liquid chromatography with electrochemical detection, during supine resting, one minute of orthostasis, and after five minutes of exercise. In total, 22 AN patients (12 binge-eating/purging type and 10 restricting type) and age-, gender-, and race-matched controls (70 ± 10.1% versus 98 ± 3.0% of ideal body weight) were recruited. RESULTS We found that patients with AN had adrenal sympathetic overactivity and neural sympathetic underactivity, demonstrated by a predominance of circulating adrenaline over noradrenaline levels, not only during the supine resting state (52 ± 2 versus 29 ± 1 pg/mL) but also during orthostasis (67 ± 3 versus 32 ± 2 pg/mL, P < 0.05) and after exercise challenge (84 ± 4 versus 30 ± 3 pg/mL, P < 0.01). CONCLUSION Considering that this peripheral autonomic nervous system disorder depends on the absolute predominance of adrenomedullary C1 adrenergic nuclei over A5 noradrenergic pontine nucleus, let us ratify the abovementioned findings. The AN syndrome depends on the predominance of overwhelming adrenal sympathetic activity over neural sympathetic activity. This combined central and autonomic nervous system profile contrasts with that registered in patients affected by hyperinsulinism, hypoglycemia, and bulimia syndrome which depends on the absolute predominance of neural sympathetic activity.
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Affiliation(s)
- Fuad Lechin
- Department of Pathophysiology, Sections of Neuroendocrinology, Neuropharmacology, and Neurochemistry, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas
- Instituto de Vias Digestivas Caracas, Centro Clínico Profesional, Caracas, Venezuela
- Correspondence: Fuad Lechin, Apartado 80 983, Caracas 1080-A, Venezuela, Tel +58 212 961 1048, Fax +58 212 961 0172, Email
| | - Bertha van der Dijs
- Department of Pathophysiology, Sections of Neuroendocrinology, Neuropharmacology, and Neurochemistry, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas
- Instituto de Vias Digestivas Caracas, Centro Clínico Profesional, Caracas, Venezuela
| | - Betty Pardey-Maldonado
- Department of Pathophysiology, Sections of Neuroendocrinology, Neuropharmacology, and Neurochemistry, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas
| | - Jairo E Rivera
- Department of Pathophysiology, Sections of Neuroendocrinology, Neuropharmacology, and Neurochemistry, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas
| | - Scarlet Baez
- Department of Pathophysiology, Sections of Neuroendocrinology, Neuropharmacology, and Neurochemistry, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas
| | - Marcel E Lechin
- Department of Internal Medicine, Texas A and M Health Science Center, College of Medicine, Texas, USA
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Effects of amantadine on circulating neurotransmitters in healthy subjects. J Neural Transm (Vienna) 2010; 117:293-9. [PMID: 20131070 PMCID: PMC2825314 DOI: 10.1007/s00702-010-0371-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2009] [Accepted: 01/10/2010] [Indexed: 12/31/2022]
Abstract
Considering that glutamatergic axons innervate the C1(Ad) medullary nuclei, which are responsible for the excitation of the peripheral adrenal glands, we decided to investigate catecholamines (noradrenaline, adrenaline and dopamine) plus indolamines (plasma serotonin and platelet serotonin) at the blood level, before and after a small oral dose of amantadine, a selective NMDA antagonist. We found that the drug provoked a selective enhancement of noradrenaline plus a minimization of adrenaline, dopamine, plasma serotonin and platelet serotonin circulating levels. Significant enhancement of diastolic blood pressure plus reduction of systolic blood pressure and heart rate paralleled the circulating parameter changes. The above findings allow us to postulate that the drug was able to enhance the peripheral neural sympathetic activity. Minimization of both adrenal sympathetic and parasympathetic activities was also registered after the amantadine challenge. The above findings supported the postulation that this drug should be a powerful therapeutic tool for treating diseases affected by adrenal sympathetic hyperactivity.
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Wells SM, Buford MC, Porter VM, Brunell HL, Bunderson-Schelvan M, Nevin AB, Cardozo-Pelaez F, Holian A. Role of the serotonergic system in reduced pulmonary function after exposure to methamphetamine. Am J Respir Cell Mol Biol 2009; 42:537-44. [PMID: 19541843 DOI: 10.1165/rcmb.2009-0121oc] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Although use of methamphetamine (MA) by smoking is the fastest growing method of administration, very limited data are available describing the effects of smoked MA. Using a murine inhalation exposure system, we explored the pulmonary effects of low-dose acute inhalation exposure to MA vapor (smoke). Inhalation of MA vapor resulted in transiently reduced pulmonary function, as measured by transpulmonary resistance, dynamic compliance, and whole-body plethysmography compared with unexposed control animals. These changes were associated with an approximately 34% reduction in serotonin (5-hydroxytryptamine [5-HT]) metabolism/inactivation to 5-hydroxyindolacetic acid, and a nearly 40% reduction in monoamine oxidase (MAO)-A activity in the lung. Pretreatment of mice with a selective 5-HT reuptake inhibitor completely ablated the MA-induced changes in pulmonary function, confirming a key role for the 5-HT transporter (serotonin transporter [SERT]) and the serotonergic system in this effect. Immunofluorescent staining of mouse lung tissue confirmed high expression of SERT in airway epithelial cells. Using mouse airway epithelial cell line, LA-4, and purified human MAO-A, it was demonstrated that MA impedes 5-HT metabolism through direct inhibition of MAO-A activity in vitro. Together, these data demonstrate that low-dose exposure to MA results in reduced pulmonary function mediated via SERT and subsequent perturbation of 5-HT metabolism in the lung. This supports a role for the serotonergic system in MA-mediated pulmonary effects.
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Affiliation(s)
- Sandra M Wells
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska 68198-5910, USA.
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Lechin F, van der Dijs B. Central nervous system plus autonomic nervous system disorders responsible for gastrointestinal and pancreatobiliary diseases. Dig Dis Sci 2009; 54:458-70. [PMID: 18629642 DOI: 10.1007/s10620-008-0369-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2008] [Accepted: 06/03/2008] [Indexed: 12/09/2022]
Abstract
Clinical digestive disorders depend on the non-adequate coupling of functioning of the gastrointestinal tract with that of its affluent systems, namely, the pancreatic exocrine and the hepato-biliary secretions. The secretion of gastrointestinal hormones is monitored by the peripheral autonomic nervous system. However, the latter is regulated by the central nervous system (CNS) circuitry localized at the medullary pontine segment of the CNS. In turn, both parasympathetic and adrenergic medullary circuitries are regulated by the pontine A5 noradrenergic (NA) and the dorsal raphe serotonergic nuclei, respectively. DR-5HT is positively correlated with the C1-Ad medullary nuclei (responsible for adrenal gland secretion), whereas the MR-5HT nucleus is positively correlated with the A5-NA pontomedullary nucleus. The latter is responsible for neural sympathetic activity (sympathetic nerves). Both types of sympathetic activities maintain an alternation with the peripheral parasympathetic branch, which is positively correlated with the enterochromaffin cells that secrete serotonin. Serotonin displays hormonal antagonism to the circulating catecholamines.
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Affiliation(s)
- Fuad Lechin
- Department of Neurophysiology, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Apartado 80.983, Caracas, 1080, Venezuela.
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Yamauchi M, Dostal J, Kimura H, Strohl KP. Effects of buspirone on posthypoxic ventilatory behavior in the C57BL/6J and A/J mouse strains. J Appl Physiol (1985) 2008; 105:518-26. [PMID: 18511527 DOI: 10.1152/japplphysiol.00069.2008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Buspirone, a partial agonist of the serotonergic 5-HT1A receptor, improves breathing irregularities in humans with Rett syndrome or brain stem injury. The purpose of this study was to examine whether buspirone alters posthypoxic ventilatory behavior in C57BL/6J (B6) and A/J mouse strains. Measurements of ventilatory behavior were collected from unanesthetized adult male mice (n=6 for each strain) using the plethysmographic method. Mice were given intraperitoneal injections of vehicle or several doses of buspirone and exposed to 2 min of hypoxia (10% O2) followed by rapid reoxygenation (100% O2). Twenty minutes later, mice were tested for hypercapnic response (8% CO(2)-92% O2). On a separate day, mice were injected with the 5-HT1A receptor antagonist 4-iodo-N-{2-[4-(methoxyphenyl)-1-piperazinyl] ethyl}-N-2-pyridinylbenzamide (p-MPPI) before the injection of buspirone, and measurements were repeated. In separate studies, arterial blood-gas analysis was performed for each strain (n=12 in B6 and 10 in A/J) with buspirone or vehicle. In both strains, buspirone stimulated ventilation at rest. In the B6 mice, the hypoxic response was unchanged, but the response to hypercapnia was reduced with buspirone (5 mg/kg; P<0.05). With reoxygenation, vehicle-treated B6 exhibited periodic breathing and greater variation in ventilation compared with A/J (P<0.01). In B6 animals, >or=3 mg/kg of buspirone reduced variation and prevented the occurrence of posthypoxic periodic breathing. Both effects were reversed by p-MPPI. Treatment effect of buspirone was not explained by a difference in resting arterial blood gases. We conclude that buspirone improves posthypoxic ventilatory irregularities in the B6 mouse through its agonist effects on the 5-HT1A receptor.
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Affiliation(s)
- Motoo Yamauchi
- Department of Medicine, Case Western Reserve University, VA Medical Center, Research Service K216, 10701 East Blvd., Cleveland, OH 44106, USA.
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Shahabi S, Hassan ZM, Mahdavi M, Dezfouli M, Rahvar MT, Naseri M, Jazani NH, Khalkhali HR. Hot and Cold Natures and Some Parameters of Neuroendocrine and Immune Systems in Traditional Iranian Medicine: A Preliminary Study. J Altern Complement Med 2008; 14:147-56. [PMID: 18307392 DOI: 10.1089/acm.2007.0693] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Shahram Shahabi
- Department of Immunology, Microbiology and Genetics; Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Zuhair Muhammad Hassan
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modarres University, Tehran, Iran
| | - Mehdi Mahdavi
- Department of Immunology, Faculty of Medical Sciences, Tarbiat Modarres University, Tehran, Iran
| | - Mahya Dezfouli
- Immunology, Asthma and Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Monireh Torabi Rahvar
- Immunology, Asthma and Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohsen Naseri
- Department of Traditional Iranian Medicine, Herbal Medicine Research Center, Shahed University, Tehran, Iran
| | - Nima Hosseni Jazani
- Department of Immunology, Microbiology and Genetics; Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Hamid Reza Khalkhali
- Department of Occupational Health, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
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Hammer TB, Oranje B, Glenthoj BY. The effects of imipramine on P50 suppression, prepulse inhibition and habituation of the startle response in humans. Int J Neuropsychopharmacol 2007; 10:787-95. [PMID: 17250777 DOI: 10.1017/s1461145706007504] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Schizophrenic patients exhibit impairments in filtering of sensory information, as can be assessed by use of prepulse inhibition (PPI) of the acoustic startle response and P50 suppression paradigms. In the treatment of negative symptoms or depressive syndromes during the course of schizophrenia antidepressants are often combined with antipsychotic medication. However, antidepressants increase monoaminergic activity, which has been suggested to decrease sensory gating, although these presumptions are mostly based on results from animal studies. Currently, little is known about monoaminergic modulation of sensory filtering in humans, and the few reports that can be found in literature show discrepancies with animal studies. The current study was designed to study the effects of increased monoaminergic activity on sensory filtering and habituation of healthy volunteers. In a double-blind, placebo-controlled cross-over design, 20 healthy male volunteers received either placebo or a dose of 50 mg imipramine (a dual-acting antidepressant), after which they were tested in a P50 suppression paradigm, a PPI paradigm, and an habituation of the startle reflex paradigm. Imipramine significantly decreased PPI as well as P50 suppression. No significant differences between the two treatments were observed on habituation of the acoustic startle reflex. Since sensory filtering is usually already reduced in patients with schizophrenia, the current results call for caution in the widespread use of dual-acting antidepressants in the treatment of depressed or negative symptoms in these patients.
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Affiliation(s)
- Trine-Bjoerg Hammer
- Center for Neuropsychiatric Schizophrenia Research, University of Copenhagen, Psychiatric Center Glostrup, Denmark
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16
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Lechin F, van der Dijs B, Hernández-Adrián G. Dorsal raphe vs. median raphe serotonergic antagonism. Anatomical, physiological, behavioral, neuroendocrinological, neuropharmacological and clinical evidences: relevance for neuropharmacological therapy. Prog Neuropsychopharmacol Biol Psychiatry 2006; 30:565-85. [PMID: 16436311 DOI: 10.1016/j.pnpbp.2005.11.025] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/30/2005] [Indexed: 01/28/2023]
Abstract
Monoaminergic neurons located in the central nervous system (CNS) are organized into complex circuits which include noradrenergic (NA), adrenergic (Ad), dopaminergic (DA), serotonergic (5-HT), histaminergic (H), GABA-ergic and glutamatergic systems. Most of these circuits are composed of more than one and often several types of the above neurons. Such physiologically flexible circuits respond appropriately to both external and internal stimuli which, if not modulated adequately, can trigger pathophysiologic responses. A great deal of research has been devoted to mapping the multiple functions of the CNS circuitry, thereby forming the basis for effective neuropharmacological therapeutic approaches. Such lineal strategies that seek to normalize complex and mixed physiological disorders, however, meet only partial therapeutic success and are often followed by undesirable side effects and/or total failure. In light of these, we have worked to develop possible models of CNS circuitry that are less affected by physiological interaction using the models to design more effective therapeutic approaches. In the present review, we cite and present evidence supporting the dorsal raphe versus median raphe serotonergic circuitry as one model of a reliable paradigm, necessary to the clear understanding and therapy of many psychiatric and even non-psychiatric disturbances.
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Affiliation(s)
- Fuad Lechin
- Department of Physiological Sciences, Section of Neurochemical, Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela.
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17
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Gogos A, Nathan PJ, Guille V, Croft RJ, van den Buuse M. Estrogen prevents 5-HT1A receptor-induced disruptions of prepulse inhibition in healthy women. Neuropsychopharmacology 2006; 31:885-9. [PMID: 16237386 DOI: 10.1038/sj.npp.1300933] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The sex steroid hormone, estrogen, has been proposed to be protective against schizophrenia. This study examined the effects of estrogen treatment on modulation of prepulse inhibition (PPI) by the serotonin-1A (5-HT1A) receptor partial agonist, buspirone. PPI is a model of sensorimotor gating, which is deficient in schizophrenia and other mental illnesses. A total of 11 healthy women were tested following four acute treatment conditions: placebo, buspirone (Buspar; 5 mg), estradiol (Estrofem; 2 mg), and combined buspirone and estradiol. Electromyogram activity was measured across three interstimulus intervals (ISI): 30, 60, and 120 ms. There was no significant effect of either drug treatment on startle amplitude or habituation. At 120 ms ISI, buspirone caused a significant disruption of PPI and pretreatment with estrogen prevented this disruption. Estrogen treatment, administered in the appropriate experimental conditions, prevented PPI deficits induced by 5-HT(1A) receptor activation and may therefore also play a protective role in sensorimotor gating deficits in schizophrenia.
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Affiliation(s)
- Andrea Gogos
- Behavioural Neuroscience Laboratory, Mental Health Research Institute of Victoria, Parkville, VIC, Australia.
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18
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Lechin F, van der Dijs B, Hernández G, Orozco B, Rodríguez S, Baez S. Acute effects of tianeptine on circulating neurotransmitters and cardiovascular parameters. Prog Neuropsychopharmacol Biol Psychiatry 2006; 30:214-22. [PMID: 16303223 DOI: 10.1016/j.pnpbp.2005.10.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/03/2005] [Indexed: 11/24/2022]
Abstract
Tianeptine is a serotonin-uptake enhancer drug whose antidepressant effectiveness is based on its ability to reduce rather than increase serotonin availability at the synaptic cleft. This paradoxical neuropharmacological mechanism has raised doubt among neuropharmacologists and psychiatrists as to the role of tianeptine as a trusty-reliable antidepressant drug. This controversial issue led us to investigate the acute effects of a single, oral dose (12.5 mg) of this drug on circulating neurotransmitters and cardiovascular parameters in 50 healthy subjects. The drug provoked a striking and significant reduction of plasma noradrenaline (NA) and plasma serotonin (f-5-HT) while it increased plasma dopamine (DA) and platelet serotonin (p-5-HT) concentrations within the 4-h study period. No adrenaline (Ad) changes were registered. The NA/Ad ratio and the f-5-HT/p-5-HT ratio showed significant reduction throughout the test. Finally, although diastolic blood pressure (DBP) showed significant decrease, neither systolic blood pressure (SBP) nor heart rate (HR) showed significant change. These findings are consistent with the postulation that tianeptine reduces both neural sympathetic activity and parasympathetic activity without affecting adrenal sympathetic activity, enabling us to discuss the possible mechanisms involved in the antidepressant effects of tianeptine. The well-known fact that major depressed patients always show raised NA plus lower than normal p-5-HT levels, both disorders which are normalized by tianeptine, gives neurochemical support to the clinical improvement triggered by the drug in these patients. Summarizing, the results presented in this study demonstrate that tianeptine triggers significant reduction of circulating noradrenaline and plasma serotonin while increasing circulating dopamine and platelet serotonin. Other possible neuropharmacological effects are also discussed.
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Affiliation(s)
- Fuad Lechin
- Department of Neurophysiology, Instituto de Medicina Experimental, Faculty of Medicine, Universidad Central de Venezuela, Caracas, Venezuela.
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19
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Lechin F, van der Dijs B. Central nervous system circuitry involved in the hyperinsulinism syndrome. Neuroendocrinology 2006; 84:222-34. [PMID: 17167239 DOI: 10.1159/000098005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Accepted: 10/30/2006] [Indexed: 12/29/2022]
Abstract
Raised plasma levels of insulin, glucose and glucagon are found in patients affected by 'hyperinsulinism'. Obesity, hypertension, mammary plus ovary cysts and rheumatic symptoms are frequently observed in these patients. Sleep disorders and depression are also present in most subjects affected by this polysymptomatic disorder. The simultaneous increases of glucose, insulin and glucagon plasma levels seen in these patients indicate that the normal crosstalk between A cells, B cells and D cells is disrupted. With respect to this, it is well known that glucose excites B cells (which secrete insulin) and inhibits A cells (which secrete glucagon), which in turn excites D cells (which secrete somatostatin). Gastrointestinal hormones (incretins) modulate this crosstalk both directly and indirectly throughout pancreatic and hepatobiliary mechanisms. The above factors depend on autonomic nervous system mediation. For instance, acetylcholine released from parasympathetic nerves excites both B and A cells. Noradrenaline released from sympathetic nerves and adrenaline secreted from the adrenal glands inhibit B cells and excite A cells, which are crowded with beta(2)- and alpha(2)-receptors, respectively. Noradrenaline released from sympathetic nerves also excites A cells by acting at alpha(1)-receptors located at this level. According to this, the excessive release of noradrenaline from these nerves should provoke an enhancement of glucagon secretion which will result in overexcitation of insulin secretion from B cells. That is the disorder seen in the so-called 'hyperinsulinism', in which raised plasma levels of glucose, insulin and glucagon coexist. Taking into account that neural sympathetic activity is positively correlated to the A5 noradrenergic nucleus and median raphe serotonergic neurons, and negatively correlated to the A6 noradrenergic, the dorsal raphe serotonergic and the C1 adrenergic neurons, we postulate that this unbalanced central nervous system circuitry is responsible for the hyperinsulinism syndrome.
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Affiliation(s)
- Fuad Lechin
- Department of Physiological Sciences, Sections of Neurochemistry, Neurophysiology, Neuroimmunology and Neuropharmacology, Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela.
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Abstract
Drugs used to treat psychiatric disorders, although effective, are often restricted by adverse events. The use of partial agonists for treating hypertension was found to limit some of the side-effects in some patients. This led to the investigation of partial agonists as a treatment modality in psychiatric disorders. Partial agonists have a lower intrinsic efficacy than full agonists leading to reduced maximum response. They can act as antagonists by competing for receptor binding with full agonists. The level of activity depends on the level of endogenous receptor activity. Buprenorphine, a partial agonist at the mu-opioid receptor, is used to treat patients with addiction and decreases the symptoms of withdrawal and risks of overdose and intoxication. The anxiolytic buspirone shows partial agonism at 5-HT(1A) receptors, and this seems to provide anxioselective effects, without inducing extrapyramidal side-effects, convulsions, tolerance or withdrawal reactions. In schizophrenia, partial dopamine agonism results in antagonistic effects at sites activated by high concentrations of dopamine and agonistic effects at sites activated by low concentrations of dopamine. This stabilizes the dopamine system to effect antipsychotic action without inducing adverse motor or hormonal events. Aripiprazole is the first 'dopamine system stabilizer', and the data are promising, with efficacy at least equivalent to that with current atypical antipsychotics but fewer of the troublesome side-effects. Partial agonists seem to provide a way to fine-tune the treatment of psychiatric disorders by maximizing the treatment effect while minimizing undesirable adverse events.
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Affiliation(s)
- R I Ohlsen
- Institute of Psychiatry, De Crespigny Park, London, UK.
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Lechin F, Pardey-Maldonado B, van der Dijs B, Benaim M, Baez S, Orozco B, Lechin AE. Circulating neurotransmitters during the different wake-sleep stages in normal subjects. Psychoneuroendocrinology 2004; 29:669-85. [PMID: 15041088 DOI: 10.1016/s0306-4530(03)00095-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2002] [Accepted: 05/05/2003] [Indexed: 11/19/2022]
Abstract
We investigated the changes of circulating neurotransmitters during the wake-sleep cycle in order to find possible correlations with the activity of central neurocircuitry functioning. Noradrenaline (NA), adrenaline (Ad), dopamine (DA), platelet serotonin (p-5HT), plasma serotonin (f-5HT) and plasma tryptophan (TRP) were assessed during the morning (supine resting + 1-min orthostasis + 5-min exercise) and at night (supine resting + slow wave sleep (SWS) + REM sleep). Only NA increased in the plasma during short-lasting (1-min) orthostasis morning waking period. Both NA and Ad rose during moderate exercise. The nocturnal results demonstrated that whereas Ad dropped during the supine resting, NA did not fall until SWS period. Although DA did not show significant changes during the nocturnal test, the NA/DA ratio showed significant reduction. The analysis of correlations supports the postulation that this finding reflects the DA modulatory role on neural sympathetic activity. Both f-5HT and p-5HT values were lower during sleep cycle than wake periods. However, they showed progressive rises during sleep stages. Conversely, the f-5HT/p-5HT ratio showed significantly greater values during the SWS period than during supine resting and REM periods. These findings are consistent with the postulation that f-5HT/p-5HT ratio is positively associated with parasympathetic activity during the sleep-cycle. We concluded that the profile of sleep-cycle circulating neurotransmitters differs from that obtained during waking periods. According to the above, we attempted to correlate the profile of circulating neurotransmitters with the very well-known central neurocircuitry functioning during wake-sleep cycle, in experimental mammals.
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Affiliation(s)
- Fuad Lechin
- Section of Neuropharmacology, Department of Physiological Sciences, Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela.
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22
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Gu B, Olejar KJ, Reiter JP, Thor KB, Dolber PC. Inhibition of bladder activity by 5-hydroxytryptamine1 serotonin receptor agonists in cats with chronic spinal cord injury. J Pharmacol Exp Ther 2004; 310:1266-72. [PMID: 15152026 DOI: 10.1124/jpet.103.063842] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The serotonin (5-hydroxytryptamine1A) 5-HT1A receptor agonist 8-OH-DPAT [(R)- (+)-8-hydroxy-2-(di-n-propylamino)tetralin] inhibits bladder activity under nociceptive but not innocuous conditions in cats with an intact spinal cord, suggestive of an effect on primary afferent C fibers or their targets. Because C fibers play a key role in reflex micturition in chronic spinal cord injury (SCI), we investigated the effect of 8-OH-DPAT on micturition in SCI cats. We also investigated GR-46611 (3-[3-(2-dimethylaminoethyl)-1H-indol-5-yl]-N-(4-methoxybenzyl)acrylamide), which has agonist activity predominantly at 5-HT1B and 5-HT1D receptors but also at the 5-HT1A receptor. Chloralose-anesthetized cats were catheterized through the bladder dome for saline-filling cystometry. Dose-response curves for i.v. 8-OH-DPAT (0.3-30 microg/kg) and GR-46611 (0.03-300 microg/kg) were followed in three cases each by 5-HT1A antagonist WAY-100635 [N-tert-butyl-3-(4-(2-methoxyphenyl)-piperazin-1-yl)-2-phenylpropanamide] at 300 microg/kg. Threshold volume, capacity, residual volume, micturition volume, and arterial pressure were measured. Intact cats showed few significant changes in cystometric variables. SCI cats responded to both 8-OH-DPAT and GR-46611 with dose-dependent increases in threshold volume, capacity, and residual volume, significant at > or =10 microg/kg for 8-OH-DPAT and at > or =3 microg/kg for GR-46611. Effects of 8-OH-DPAT but not GR-46611 were largely reversed by WAY-100635. Both 5-HT1A and 5-HT1B/1D agonists may offer a promising means of reducing bladder hyperactivity and increasing bladder capacity in patients with chronic SCI.
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Affiliation(s)
- Baojun Gu
- Division of Urology, Box 3453, Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
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23
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Lechin F, van der Dijs B, Lechin AE. Tianeptine: a new exploratory therapy for asthma. Chest 2004; 125:348-9; author reply 349. [PMID: 14718467 DOI: 10.1378/chest.125.1.348] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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24
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Lechin F, van der Dijs B, Lechin AE. Pulmonary hypertension, left ventricular dysfunction and plasma serotonin: commentary on Deuchar et al. Br J Pharmacol 2002; 137:937-8; author reply 938. [PMID: 12411426 PMCID: PMC1573567 DOI: 10.1038/sj.bjp.0704947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Fuad Lechin
- Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela
- Author for correspondence:
| | - Bertha van der Dijs
- Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela
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25
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Malt EA, Olafsson S, Lund A, Ursin H. Factors explaining variance in perceived pain in women with fibromyalgia. BMC Musculoskelet Disord 2002; 3:12. [PMID: 12019032 PMCID: PMC113754 DOI: 10.1186/1471-2474-3-12] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2002] [Accepted: 04/25/2002] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND We hypothesized that a substantial proportion of the subjectively experienced variance in pain in fibromyalgia patients would be explained by psychological factors alone, but that a combined model, including neuroendocrine and autonomic factors, would give the most parsimonious explanation of variance in pain. METHODS Psychometric assessment included McGill Pain Questionnaire, General Health Questionnaire, Hospital Anxiety and Depression Rating Scale, Eysenck personality Inventory, Neuroticism and Lie subscales, Toronto Alexithymia Scale, and Multidimensional Health Locus of Control Scale and was performed in 42 female patients with fibromyalgia and 48 female age matched random sample population controls. A subgroup of the original sample (22 fibromyalgia patients and 13 controls) underwent a pharmacological challenge test with buspirone to assess autonomic and adrenocortical reactivity to serotonergic challenge. RESULTS Although fibromyalgia patients scored high on neuroticism, anxiety, depression and general distress, only a minor part of variance in pain was explained by psychological factors alone. High pain score was associated with high neuroticism, low baseline cortisol level and small drop in systolic blood pressure after buspirone challenge test. This model explained 41.5% of total pain in fibromyalgia patients. In population controls, psychological factors alone were significant predictors for variance in pain. CONCLUSION Fibromyalgia patients may have reduced reactivity in the central sympathetic system or perturbations in the sympathetic-parasympathetic balance. This study shows that a biopsychosocial model, including psychological factors as well as factors related to perturbations of the autonomic nervous system and hypothalamic-pituitary-adrenal axis, is needed to explain perceived pain in fibromyalgia patients.
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Affiliation(s)
- Eva Albertsen Malt
- Department of Psychiatry, University of Bergen Haukeland University Hospital, N-5022 Bergen, Norway
| | - Snorri Olafsson
- Department of Internal Medicine, University of Bergen Haukeland University Hospital, N-5022 Bergen, Norway
| | - Anders Lund
- Department of Psychiatry, University of Bergen Haukeland University Hospital, N-5022 Bergen, Norway
| | - Holger Ursin
- Department of Biological And Medical Psychology, Division of Physiological Psychology University of Bergen, N-5022 Bergen, Norway
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26
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Lechin F, van der Dijs B. Re: Belohláková et al. Fenfluramine-induced pulmonary vasoconstriction: role of serotonin receptors and potassium channels. J Appl Physiol 91:755-761, 2001. J Appl Physiol (1985) 2002; 92:1363-4. [PMID: 11890153 DOI: 10.1152/japplphysiol.00923.2001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Bouwknecht JA, Hijzen TH, van der Gugten J, Maes RAA, Hen R, Olivier B. 5-HT(1B) receptor knockout mice show no adaptive changes in 5-HT(1A) receptor function as measured telemetrically on body temperature and heart rate responses. Brain Res Bull 2002; 57:93-102. [PMID: 11827741 DOI: 10.1016/s0361-9230(01)00640-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Two presynaptic receptors play an important role in the regulation of serotonergic neurotransmission, i.e., the 5-HT(1A) and 5-HT(1B) receptor. The present study focuses on putative adaptive changes in the 5-HT(1A) receptor system in mice that lack 5-HT(1B) receptors (5-HT(1B) KO). 5-HT(1A) receptor sensitivity was assessed in vivo in two models of presynaptic 5-HT(1A) receptor activity: agonist-induced hypothermia and prevention of stress-induced hyperthermia. The effects of 5-HT(1A) receptor activation by flesinoxan (0.1-3.0 mg/kg s.c.) were determined telemetrically on body temperature and heart rate in 5-HT(1B) KO and wild-type (WT) mice. Flesinoxan induced hypothermia dose-dependently without affecting heart rate and prevented stress-induced hyperthermia and tachycardia equipotently in both genotypes. Specificity of these responses was confirmed by blockade with the selective 5-HT(1A) receptor antagonist WAY100635 (1.0 mg/kg s.c.). The importance of continuous sampling in freely moving subjects to improve appropriate characterization of mutants is discussed. 5-HT(1B) KO mice showed no shift in 5-HT(1A) receptor sensitivity compared to WT mice. This study found no indications for adaptive changes in presynaptic 5-HT(1A) receptor function in 5-HT(1B) KO mice as measured telemetrically on body temperature and heart rate responses.
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MESH Headings
- Adaptation, Physiological/genetics
- Animals
- Body Temperature/drug effects
- Body Temperature/genetics
- Central Nervous System/drug effects
- Central Nervous System/metabolism
- Central Nervous System/physiopathology
- Heart Rate/drug effects
- Heart Rate/genetics
- Male
- Mice
- Mice, Knockout
- Phenotype
- Piperazines/pharmacology
- Pyridines/pharmacology
- Receptor, Serotonin, 5-HT1B
- Receptors, Serotonin/deficiency
- Receptors, Serotonin/drug effects
- Receptors, Serotonin/genetics
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1
- Serotonin/genetics
- Serotonin/metabolism
- Serotonin Antagonists/pharmacology
- Serotonin Receptor Agonists/pharmacology
- Stress, Physiological/complications
- Stress, Physiological/metabolism
- Stress, Physiological/physiopathology
- Synaptic Transmission/drug effects
- Synaptic Transmission/genetics
- Telemetry
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Affiliation(s)
- J Adriaan Bouwknecht
- Department of Psychopharmacology, Faculty of Pharmacy, Utrecht University, Utrecht, The Netherlands.
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30
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Bouwknecht JA, Hijzen TH, van der Gugten J, Maes RA, Olivier B. Stress-induced hyperthermia in mice: effects of flesinoxan on heart rate and body temperature. Eur J Pharmacol 2000; 400:59-66. [PMID: 10913585 DOI: 10.1016/s0014-2999(00)00387-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Stress-induced hyperthermia in mice has predictive validity for anxiolytic properties of drugs. In this paradigm, 60 min after drug administration rectal temperature is measured, which causes hyperthermia of 1-1.5 degrees C (DeltaT) in about 10 min. Flesinoxan, a selective 5-HT(1A) receptor agonist with anxiolytic-like properties, causes hypothermia, which complicates interpretation of stress-induced hyperthermia. Therefore, we combined flesinoxan treatment and the stress paradigm with radiotelemetric measurement of body temperature and heart rate, which is also related to anxiety. Subjects were either undisturbed or injected with flesinoxan (0-0.1-0.3-1.0 and 3.0 mg/kg), with or without the stress paradigm. Flesinoxan (1.0 and 3.0 mg/kg) caused a relatively long-lasting hypothermia, but did not lower heart rate. The rectal temperature procedure caused hyperthermia and tachycardia. Flesinoxan reduced the stress-induced hyperthermia and the tachycardia evoked by the stress procedure. Continuous radiotelemetric measurement of heart rate, apart from body temperature, revealed that flesinoxan has anxiolytic-like properties in mice.
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Affiliation(s)
- J A Bouwknecht
- Department of Psychopharmacology, Faculty of Pharmacy, Utrecht University, Sorbonnelaan 16, 3584 CA, Utrecht, Netherlands.
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Reader TA, Ase AR, Le Marec N, Lalonde R. Effects of buspirone on brain indoleamines and catecholamines in wild-type mice and Lurcher mutants. Eur J Pharmacol 2000; 398:41-51. [PMID: 10856446 DOI: 10.1016/s0014-2999(00)00298-3] [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: 11/21/2022]
Abstract
The effects of a chronic serotoninergic stimulation on brain monoamine levels and metabolism were studied in wild-type (+/+) mice and Lurcher (Lc/+) mutants. Endogenous serotonin, dopamine, noradrenaline and some of their major metabolites were measured in the frontal cortex, neostriatum, thalamus, brainstem, cerebellum and spinal cord. In +/+ mice, buspirone (1 mg/kg; i.p.) treatment during 40 days increased indoleamines, albeit with moderate changes in the ratios between tissue serotonin metabolites and endogenous serotonin, augmented noradrenaline contents in the spinal cord, and caused elevations of dopamine metabolites in most regions. In Lc/+ mutants, the effects of buspirone were attenuated, but higher L-tryptophan and indoleamine levels, suggest a storage of serotonin in a non-releasable compartment. In the hypoplastic Lc/+ cerebellum, indoleamine content was accrued, but with a decreased [serotonin metabolites]/[serotonin] ratio, indicating that the reorganized nerve terminals in Lc/+ mutants although they can synthesize and accumulate serotonin, may not utilize it efficiently in synaptic transmission.
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Affiliation(s)
- T A Reader
- Centre de Recherche en Sciences Neurologiques, Département de physiologie, Faculté de médecine, Université de Montréal, H3C 3J7, Montreal, Québec, Canada.
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