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Lopes FI, do Vale B, Cafarchio EM, Dsouki NA, Aronsson P, Sato MA. Activation of 5-HT3 receptors in the medulla oblongata is involved in the phasic control of urinary bladder. Neurosci Lett 2022; 790:136886. [PMID: 36179901 DOI: 10.1016/j.neulet.2022.136886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/13/2022] [Accepted: 09/20/2022] [Indexed: 11/21/2022]
Abstract
The control of micturition depends on reflex mechanisms, however, it undergoes modulation from cortex, pons and medullary areas. This study investigated if the activation of 5-HT3 receptors in the medulla influences the urinary bladder (UB) regulation in rats. Isoflurane female Wistar rats were submitted to catheterization of the femoral artery and vein for mean arterial pressure (MAP) and heart rate (HR) recordings and injection of drugs, respectively. The UB was cannulated for intravesical pressure (IP) measurement. The Doppler flow probe was placed around the left renal artery for renal conductance (RC) recordings. Phenylbiguanide (PB) and granisetron (GN) were injected into the 4th brain ventricle in rats with guide cannulas implanted 5 days prior to the experiments; or PB and GN were randomly injected intravenously or applied topically (in situ) on the UB. PB injection into 4th V significantly increased IP (68.67 ± 11.70%) and decreased MAP (-29 ± 6 mmHg) compared to saline (0.34 ± 0.64% and -2 ± 2 mmHg), with no changes in the HR and RC. GN injection into the 4th V did not significantly change the IP and RC compared to saline, nevertheless, significantly increased MAP (25 ± 4 mmHg) and heart rate (36 ± 9 bpm) compared to saline. Intravenous PB and GN only produced cardiovascular effects, whilst PB but not GN in situ on the UB evoked increase in IP (111.60 ± 30.36%). Therefore, the activation of 5HT-3 receptors in medullary areas increases the intravesical pressure and these receptors are involved in the phasic control of UB. In contrast, 5-HT3 receptors in the medulla oblongata are involved in the pathways of the tonic control of the cardiovascular system. The activation of 5-HT3 receptors in the bladder cause increase in intravesical pressure and this regulation seem to be under phasic control as the blockade of such receptors elicits no changes in baseline intravesical pressure.
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Lv X, Wo C, Yao J, Lu W, Yu Z, Qin Y, Wang Y, Zhang Z, Wu Y, Huang Y, Wang L. Silver Needle Thermal Therapy Relieves Pain, Repairs the Damaged Myofascial Fiber, and Reduces the Expression of 5-HT3 Receptors in the Spinal Cord of Rats with Myofascial Pain Syndrome. Neurol India 2022; 70:S288-S295. [PMID: 36412383 DOI: 10.4103/0028-3886.360917] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
BACKGROUND There is an urgent clinical need to provide a theoretical basis for silver needle thermal therapy to Myofacial pain syndrome (MPS). OBJECTIVE This study was conducted to explore the effect of silver needle thermal therapy on myofascial pain syndrome in rats. METHODS MPS rat models were duplicated, and the rats were subsequently divided into model and treatment groups. A normal control group was synchronously set up. No treatment was given to the model group, whereas silver needle thermal therapy was administered to the treatment group. The thermal and mechanical pain threshold, the morphological structure as well as the expression of 5-HT3 receptors in the spinal cord were observed. RESULTS Rats from the treatment group presented with a significantly higher pain threshold compared to the untreated model group. UNLABELLED The myofascial arrangement of the affected part of the model group was disordered, and some muscle fibers were atrophied and deformed. Meanwhile, the myofascial arrangement of the treatment group became more regular than that of the model group. The expression levels of 5-HT3 receptor in the spinal cord of the untreated model group were significantly increased, while being markedly decreased in the treatment group. CONCLUSIONS Silver needle thermal therapy can augment the pain threshold of rats with MPS, repair the damaged myofascial membrane in the rats, and further reduce the expression of 5-HT3 receptors in the spinal cord of the MPS rats.
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Affiliation(s)
- Xianglong Lv
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Chunxin Wo
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Jing Yao
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Wei Lu
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Zilong Yu
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Yue Qin
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Yue Wang
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Zhongjie Zhang
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Yu Wu
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Yuanxin Huang
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
| | - Lin Wang
- Pain Department, Guizhou Medical University, Guiyang 550004, P. R., China
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Bhatt S, Devadoss T, Manjula SN, Rajangam J. 5-HT 3 receptor antagonism a potential therapeutic approach for the treatment of depression and other disorders. Curr Neuropharmacol 2021; 19:1545-1559. [PMID: 33059577 PMCID: PMC8762176 DOI: 10.2174/1570159x18666201015155816] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [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: 06/25/2020] [Revised: 09/11/2020] [Accepted: 10/10/2020] [Indexed: 11/29/2022] Open
Abstract
Background Depression or Major depressive disorder (MDD) is a prolonged condition of sadness. MDD is the most common mental disorder that affects more than 264 million people worldwide. According to the monoamine hypothesis, serotonin (5-hydroxy tryptamine, 5-HT), dopamine (DA) and norepinephrine (NE) are the major neurotransmitters (NTs) involved in depression. Methods The methodology adopted for writing this review article is essentially based on the secondary literature search through a systematic literature review. This review mainly focussed on the role of 5-HT3 receptor antagonists (5-HT3RA) in depression and comorbid disorders like anxiety. Results Out of three major NTs mentioned above, serotonin has a predominant role in the pathophysiology of depression. The serotonin type-3 receptors (5-HT3R) are well renowned to be expressed in the central nervous system (CNS) in regions which have significance in the vomiting reflex, perception of pain, the reward system, cognition, depression and anxiety control. 5-HT3R are the receptors of serotonergic family that belong to ligand-gated ion channel. 5-HT3RA inhibit the binding of serotonin to postsynaptic 5-HT3R and increases its availability to other receptors like 5-HT1A, 1B and 1D as well as 5-HT2 receptors and produces anti-depressant-like effect. 5-HT3RA also have an important role in mood and stress disorders. Some of the studies have shown the effectiveness of these agents in stress disorder. Conclusion The present article focussed on the role of 5-HT3R and their antagonists in the treatment of depression and anxiety. Further studies are warranted to prove their efficacy with respect to other standard anti-depressants.
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Affiliation(s)
- Shvetank Bhatt
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior-474005, India
| | - Thangaraj Devadoss
- Department of Pharmaceutical Chemistry, K. V. S. R. Siddhartha College of Pharmaceutical Sciences, Siddhartha Nagar, Vijayawada, Andhra Pradesh-520010, India
| | - Santhepete Nanjundaiah Manjula
- Department of Pharmacology, JSS College of Pharmacy, Mysuru, JSS Academy of Higher Education & Research [JSSAHER], Mysuru-570015, India
| | - Jayaraman Rajangam
- Department of Pharmacology, Sree Vidyanikethan College of Pharmacy - Tirupati-517 501, Andhra Pradesh, India
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Goodarzi P, Habibi M, Roberts K, Sutton J, Shili CN, Lin D, Pezeshki A. Dietary Tryptophan Supplementation Alters Fat and Glucose Metabolism in a Low-Birthweight Piglet Model. Nutrients 2021; 13:2561. [PMID: 34444719 PMCID: PMC8399558 DOI: 10.3390/nu13082561] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 07/10/2021] [Accepted: 07/21/2021] [Indexed: 12/21/2022] Open
Abstract
Low birthweight (LBW) is associated with metabolic complications, such as glucose and lipid metabolism disturbances in early life. The objective of this study was to assess: (1) the effect of dietary tryptophan (Trp) on glucose and fat metabolism in an LBW piglet model, and (2) the role peripheral 5-hydroxytryptamine type 3 (5HT3) receptors in regulating the feeding behavior in LBW piglets fed with Trp-supplemented diets. Seven-day-old piglets were assigned to 4 treatments: normal birthweight-0%Trp (NBW-T0), LBW-0%Trp (LBW-T0), LBW-0.4%Trp (LBW-T0.4), and LBW-0.8%Trp (LBW-T0.8) for 3 weeks. Compared to LBW-T0, the blood glucose was decreased in LBW-T0.8 at 60 min following the meal test, and the triglycerides were lower in LBW-T0.4 and LBW-T0.8. Relative to LBW-T0, LBW-T0.8 had a lower transcript and protein abundance of hepatic glucose transporter-2, a higher mRNA abundance of glucokinase, and a lower transcript of phosphoenolpyruvate carboxykinase. LBW-T0.4 tended to have a lower protein abundance of sodium-glucose co-transporter 1 in the jejunum. In comparison with LBW-T0, LBW-T0.4 and LBW-T0.8 had a lower transcript of hepatic acetyl-CoA carboxylase, and LBW-T0.4 had a higher transcript of 3-hydroxyacyl-CoA dehydrogenase. Blocking 5-HT3 receptors with ondansetron reduced the feed intake in all groups, with a transient effect on LBW-T0, but more persistent effect on LBW-T0.8 and NBW-T0. In conclusion, Trp supplementation reduced the hepatic lipogenesis and gluconeogenesis, but increased the glycolysis in LBW piglets. Peripheral serotonin is likely involved in the regulation of feeding behavior, particularly in LBW piglets fed diets supplemented with a higher dose of Trp.
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Affiliation(s)
- Parniyan Goodarzi
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
| | - Mohammad Habibi
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
| | - Kennedy Roberts
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
| | - Julia Sutton
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
| | - Cedrick Ndhumba Shili
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
| | - Dingbo Lin
- Department of Nutritional Sciences, Oklahoma State University, Stillwater, OK 74078, USA;
| | - Adel Pezeshki
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA; (P.G.); (M.H.); (K.R.); (J.S.); (C.N.S.)
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Rodrigues Tavares LR, Pelarin V, Baptista-de-Souza D, Pereira Ferrari D, Nunes-de-Souza RL, Canto-de-Souza A. 5-HT 3 receptor within the amygdaloid complex modulates pain hypersensitivity induced by empathy model of cohabitation with a partner in chronic pain condition in mice. Soc Neurosci 2021; 16:534-548. [PMID: 34253155 DOI: 10.1080/17470919.2021.1954083] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cohabitation with a partner undergoing chronic pain induces pain hypersensitivity. Among a lot of other neurochemical pathways, the serotonin (5-HT) role, specifically the 5-HT3 receptor (5-HT3R), in the amygdala has never been evaluated in this model. Here we studied the effects of the amygdala's chemical inhibition, its neuronal activation pattern, and 5-HT, 5-HIAA, and 5-HT turnover within the amygdala. Furthermore, the systemic and intra-amygdala 5-HT3R activation and blockade in mice that cohabited with a conspecific subjected to chronic constriction injury were investigated. Male Swiss mice were housed in partners for 28 days. The dyads were divided into two groups on the 14th day: cagemate nerve constriction (CNC) and cagemate sham (CS). On the 24th day, cagemates underwent a stereotaxic surgery (when necessary) and, on the 28th day, they were evaluated on the writhing test. The amygdala inactivation promotes pain-hypersensitivity behaviors in groups and dyads; cohabitation with a partner with chronic pain did not change FosB-labeled cells in the amygdala's nucleus and increases 5-HT turnover in cagemates. Systemic and intra-amygdala 5-HT3R activation attenuated and enhanced the number of writhes, respectively. In contrast, 5-HT3R blockade reduced hypersensitivity pain response. Results suggest the involvement of amygdala serotonergic signaling via 5-HT3R in empathy-like behavior.
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Affiliation(s)
- Lígia Renata Rodrigues Tavares
- Psychobiology Group, Department of Psychology/CECH, Universidade Federal de São Carlos - UFSCar, São Carlos, Brazil.,Joint Graduate Program in Physiological Sciences UFSCar/UNESP, São Carlos, Brazil
| | - Vinícius Pelarin
- Psychobiology Group, Department of Psychology/CECH, Universidade Federal de São Carlos - UFSCar, São Carlos, Brazil.,Joint Graduate Program in Physiological Sciences UFSCar/UNESP, São Carlos, Brazil
| | - Daniela Baptista-de-Souza
- Psychobiology Group, Department of Psychology/CECH, Universidade Federal de São Carlos - UFSCar, São Carlos, Brazil.,Lab. Pharmacology, School of Pharmaceutical Sciences, Univ. Estadual Paulista - UNESP, Araraquara, Brazil.,Neuroscience and Behavior Institute - IneC, Ribeirão Preto, Brazil
| | - Daniele Pereira Ferrari
- Psychobiology Group, Department of Psychology/CECH, Universidade Federal de São Carlos - UFSCar, São Carlos, Brazil
| | - Ricardo Luiz Nunes-de-Souza
- Joint Graduate Program in Physiological Sciences UFSCar/UNESP, São Carlos, Brazil.,Lab. Pharmacology, School of Pharmaceutical Sciences, Univ. Estadual Paulista - UNESP, Araraquara, Brazil.,Neuroscience and Behavior Institute - IneC, Ribeirão Preto, Brazil
| | - Azair Canto-de-Souza
- Psychobiology Group, Department of Psychology/CECH, Universidade Federal de São Carlos - UFSCar, São Carlos, Brazil.,Joint Graduate Program in Physiological Sciences UFSCar/UNESP, São Carlos, Brazil.,Neuroscience and Behavior Institute - IneC, Ribeirão Preto, Brazil.,Program in Psychology UFSCar, São Carlos, Brazil
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6
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Crnjar A, Mesoy SM, Lummis SCR, Molteni C. A Single Mutation in the Outer Lipid-Facing Helix of a Pentameric Ligand-Gated Ion Channel Affects Channel Function Through a Radially-Propagating Mechanism. Front Mol Biosci 2021; 8:644720. [PMID: 33996899 PMCID: PMC8119899 DOI: 10.3389/fmolb.2021.644720] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 02/22/2021] [Indexed: 11/13/2022] Open
Abstract
Pentameric ligand-gated ion channels (pLGICs) mediate fast synaptic transmission and are crucial drug targets. Their gating mechanism is triggered by ligand binding in the extracellular domain that culminates in the opening of a hydrophobic gate in the transmembrane domain. This domain is made of four α-helices (M1 to M4). Recently the outer lipid-facing helix (M4) has been shown to be key to receptor function, however its role in channel opening is still poorly understood. It could act through its neighboring helices (M1/M3), or via the M4 tip interacting with the pivotal Cys-loop in the extracellular domain. Mutation of a single M4 tyrosine (Y441) to alanine renders one pLGIC-the 5-HT3A receptor-unable to function despite robust ligand binding. Using Y441A as a proxy for M4 function, we here predict likely paths of Y441 action using molecular dynamics, and test these predictions with functional assays of mutant receptors in HEK cells and Xenopus oocytes using fluorescent membrane potential sensitive dye and two-electrode voltage clamp respectively. We show that Y441 does not act via the M4 tip or Cys-loop, but instead connects radially through M1 to a residue near the ion channel hydrophobic gate on the pore-lining helix M2. This demonstrates the active role of the M4 helix in channel opening.
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Affiliation(s)
| | - Susanne M. Mesoy
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | - Sarah C. R. Lummis
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | - Carla Molteni
- Physics Department, King's College London, London, United Kingdom
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7
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Singh SK, Muthu MS, Revand R, Mandal MB. Intra-arterial Instillation of a Nociceptive Agent Modulates Cardiorespiratory Parameters Involving 5-HT3 and TRPV1 Receptors in Anesthetized Rats. Cardiovasc Hematol Disord Drug Targets 2021; 21:46-54. [PMID: 33829976 DOI: 10.2174/1871529x21666210408101442] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 01/23/2021] [Accepted: 03/01/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Since long back, it has been a matter of discussion regarding the role of peripheral blood vessels in the regulation of cardiorespiratory (CVR) system. OBJECTIVE The role of 5-HT3 and TRPV1 receptors present on perivascular nerves in elicitation of CVR reflexes was examined after intra-arterial instillation of bradykinin in urethane anesthetized rats. MATERIALS AND METHODS Femoral artery was cannulated retrogradely and was utilized for the instillation of saline/agonist/antagonist and recording of blood pressure (BP), using a double ported 24G cannula. BP, respiration and ECG were recorded for 30 min after bradykinin (1 μM) in the absence or presence of antagonists. RESULTS Instillation of bradykinin produced immediate hypotensive (40%), bradycardiac (17%), tachypnoeic (45%) and hyperventilatory (96%) responses of shorter latencies (5-8 s) favoring the neural mechanisms in producing the responses. In lignocaine (2%) pretreated animals, bradykinin- induced hypotensive (10%), bradycardiac (1.7%), tachypnoeic (13%) and hyperventilatory (13%) responses attenuated significantly. Pretreatment with ondansetron (100 μg/kg), 5-HT3-antagonist attenuated the hypotensive (10%), bradycardiac (1.7%), tachypnoeic (11%) and hyperventilatory (11%) responses significantly. Pretreatment with capsazepine (1 mg/kg), transient receptor potential vanilloid 1- antagonist blocked the hypotensive (5%), bradycardiac (1.2%), tachypnoeic (6%) and hyperventilatory (6%) responses significantly. CONCLUSION In conclusion, presence of a nociceptive agent in the local segment of an artery evokes vasosensory reflex responses modulating CVR parameters involving TRPV1 and 5-HT3 receptors present on the perivascular sensory nerve terminals in anesthetized rats.
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Affiliation(s)
- Sanjeev K Singh
- Department of Physiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP-221005, India
| | - M S Muthu
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, UP- -221005, India
| | - Ravindran Revand
- Department of Physiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP-221005, India
| | - Maloy B Mandal
- Department of Physiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, UP-221005, India
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8
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Affiliation(s)
- Cynthia Kwan
- Neurodegenerative Disease Group, Montreal Neurological Institute, H3A 2B4 Montreal, QC, Canada
| | - Philippe Huot
- Neurodegenerative Disease Group, Montreal Neurological Institute, H3A 2B4 Montreal, QC, Canada.,Department of Neurology & Neurosurgery, McGill University, H3A 2B4 Montreal, QC, Canada.,Department of Neuroscience, McGill University Health Centre, H3A 2B4 Montreal, QC, Canada
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9
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Iyer KA, Alix K, Eltit JM, Solis E, Pan X, Argade MD, Khatri S, De Felice LJ, Sweet DH, Schulte MK, Dukat M. Multi-modal antidepressant-like action of 6- and 7-chloro-2-aminodihydroquinazolines in the mouse tail suspension test. Psychopharmacology (Berl) 2019; 236:2093-2104. [PMID: 30805668 DOI: 10.1007/s00213-019-05203-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 02/14/2019] [Indexed: 01/08/2023]
Abstract
RATIONALE 2-Amino-6-chloro-3,4-dihydroquinazoline (e.g., A6CDQ) represents a novel putative antidepressant originally thought to act through a 5-HT3 serotonin receptor antagonist mechanism. Here, we investigated this further by examining a positional isomer of A6CDQ (i.e., A7CDQ). MATERIALS AND METHODS 5-HT3 receptor and transporter activity (uptake-1 and uptake-2) were investigated using a variety of in vitro assays and the in vivo mouse tail suspension test (TST). RESULTS Although A7CDQ binds at 5-HT3 receptors with low affinity (Ki = 1975 nM) compared to A6CDQ (Ki = 80 nM), it retained 5-HT3 receptor antagonist action (IC50 = 5.77 and 0.26 μM, respectively). In the mouse TST A7CDQ produced antidepressant-like actions (ED50 = 0.09 mg/kg) comparable to that of A6CDQ. In addition, A6CDQ was found to be a 5-HT releasing agent (Km = 2.8 μM) at hSERT and a reuptake inhibitor (IC50 = 1.8 μM) at hNET, whereas A7CDQ was a weak reuptake inhibitor (Km = 43.6 μM) at SERT but a releasing agent (EC50 = 3.3 μM) at hNET. Moreover, A6CDQ and A7CDQ were potent inhibitors of uptake-2 (e.g.; OCT3 IC50 = 3.9 and 5.9 μM, respectively). CONCLUSIONS A simple shift of a substituent in a common quinazoline scaffold from one position to another (i.e., a chloro group from the 6- to the 7-position) resulted in a common action in the TST but via a somewhat different mechanism. A6CDQ and A7CDQ might represent the first members of a new class of potential antidepressants with a unique multi-modal mechanism of action.
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Affiliation(s)
- Kavita A Iyer
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, PO Box 980540, Richmond, VA, 23298-540, USA
| | - Katie Alix
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, PO Box 980540, Richmond, VA, 23298-540, USA
| | - Jose M Eltit
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Ernesto Solis
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Xiaolei Pan
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Malaika D Argade
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, PO Box 980540, Richmond, VA, 23298-540, USA
| | - Shailesh Khatri
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, University of Sciences, Philadelphia, PA, 19104, USA
| | - Louis J De Felice
- Department of Physiology and Biophysics, School of Medicine, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Douglas H Sweet
- Department of Pharmaceutics, School of Pharmacy, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Marvin K Schulte
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, Kasiska Division of Health Sciences, Idaho State University, Pocatello, ID, 83209, USA
| | - Małgorzata Dukat
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, PO Box 980540, Richmond, VA, 23298-540, USA.
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Kossakowski R, Schlicker E, Toczek M, Weresa J, Malinowska B. Cannabidiol Affects the Bezold-Jarisch Reflex via TRPV1 and 5-HT 3 Receptors and Has Peripheral Sympathomimetic Effects in Spontaneously Hypertensive and Normotensive Rats. Front Pharmacol 2019; 10:500. [PMID: 31178718 PMCID: PMC6538767 DOI: 10.3389/fphar.2019.00500] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 02/14/2019] [Accepted: 04/23/2019] [Indexed: 12/17/2022] Open
Abstract
Cannabidiol (CBD) is a nonpsychotropic constituent of Cannabis sativa L. It is suggested to be useful in hypertension. Under in vitro conditions, it activates vanilloid TRPV1 and inhibits serotonin 5-HT3 receptors, i.e., receptors involved in the Bezold-Jarisch reflex stimulation. The aim of our study was to compare the cardiovascular effects of CBD in spontaneously hypertensive (SHR) and normotensive Wistar Kyoto (WKY) rats. Experiments were performed on conscious, urethane-anesthetized, and pithed rats. In pithed SHR and WKY, CBD increased heart rate (HR) and systolic blood pressure (SBP) and decreased diastolic BP (DBP) in a manner insensitive to adrenalectomy. Propranolol strongly impaired the CBD-induced increases in HR and SBP without affecting the decreases in DBP. Desipramine also reduced the CBD-induced effects on HR and SBP and further increased its effects on DBP. In anesthetized rats, bolus i.v. injection of single doses of CBD induced short-lasting decreases in HR, SBP, and DBP, stronger in SHR than in WKY and prevented by bilateral vagotomy. The CBD-induced fall in HR but not in BP was diminished by the TRPV1 receptor antagonist capsazepine and almost completely abolished if CBD was re-injected after previous administration. CBD reduced the Bezold-Jarisch reflex elicited by the 5-HT3 receptor agonist phenylbiguanide but not that evoked by the TRPV1 agonist capsaicin. In conscious rats, CBD did not affect cardiovascular parameters. In isolated left atria, CBD decreased contractile force. Conclusions: Cannabidiol (1) induces the Bezold-Jarisch reflex likely via TRPV1 receptors (which undergo tachyphylaxis) more markedly in SHR than in WKY; (2) inhibits the Bezold-Jarisch reflex induced by activation of 5-HT3 but not TRPV1 receptors; (3) has peripheral sympathomimetic, (4) vasodilatory, and (5) negative inotropic effects. The above properties of CBD should be taken under consideration when CBD is used for therapeutic purposes.
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Affiliation(s)
- Rafał Kossakowski
- Department of Experimental Physiology and Pathophysiology, Medical University of Białystok, Bialystok, Poland
| | - Eberhard Schlicker
- Department of Pharmacology and Toxicology, University of Bonn, Bonn, Germany
| | - Marek Toczek
- Department of Experimental Physiology and Pathophysiology, Medical University of Białystok, Bialystok, Poland
| | - Jolanta Weresa
- Department of Experimental Physiology and Pathophysiology, Medical University of Białystok, Bialystok, Poland
| | - Barbara Malinowska
- Department of Experimental Physiology and Pathophysiology, Medical University of Białystok, Bialystok, Poland
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Hao R, Qi Y, Hou DN, Ji YY, Zheng CY, Li CY, Yung WH, Lu B, Huang Y. Corrigendum: BDNF val66met Polymorphism Impairs Hippocampal Long-Term Depression by Down-Regulation of 5-HT3 Receptors. Front Cell Neurosci 2017; 11:351. [PMID: 29219152 PMCID: PMC5715334 DOI: 10.3389/fncel.2017.00351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 10/23/2017] [Indexed: 11/30/2022] Open
Affiliation(s)
- Rui Hao
- Department of Neurology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yu Qi
- Department of Neurology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Dong-Ni Hou
- Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yuan-Yuan Ji
- Neurodegeneration Discovery Performance Unit, GlaxoSmithKline (China) R&D, Shanghai, China
| | - Chun-Yan Zheng
- Neurodegeneration Discovery Performance Unit, GlaxoSmithKline (China) R&D, Shanghai, China
| | - Chu-Yu Li
- Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Wing-Ho Yung
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Bai Lu
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, China
| | - Ying Huang
- Department of Neurology, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
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Hao R, Qi Y, Hou DN, Ji YY, Zheng CY, Li CY, Yung WH, Lu B, Huang Y. BDNF val66met Polymorphism Impairs Hippocampal Long-Term Depression by Down-Regulation of 5-HT3 Receptors. Front Cell Neurosci 2017; 11:306. [PMID: 29075179 PMCID: PMC5643500 DOI: 10.3389/fncel.2017.00306] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [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: 04/13/2017] [Accepted: 09/13/2017] [Indexed: 12/17/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) is a key regulator of neuronal plasticity and cognitive functions. BDNF val66met polymorphism, a human single-nucleotide polymorphism (SNP) in the pro-domain of BDNF gene, is associated with deficits in activity-dependent BDNF secretion and hippocampus-dependent memory. However, the underlying mechanism remains unclear. Here we show that in the BDNFMet/Met mouse line mimicking the human SNP, BDNF expression in the hippocampus was decreased. There was a reduction in the total number of cells in hippocampal CA1 region, while hippocampal expression of mRNAs for NR2a, 2b, GluR1, 2 and GABAARβ3 subunits were up-regulated. Although basal glutamatergic neurotransmission was unaltered, hippocampal long-term depression (LTD) induced by low-frequency stimulation was impaired, which was partially rescued by exogenous application of BDNF. Interestingly, 5-HT3a receptors were down-regulated in the hippocampus of BDNFMet/Met mice, whereas 5-HT2c receptors were up-regulated. Moreover, impaired LTD in BDNFMet/Met mice was reversed by 5-HT3aR agonist. Thus, these observations indicate that BDNF val66met polymorphism changes hippocampal synaptic plasticity via down-regulation of 5-HT3a receptors, which may underlie cognition dysfunction of Met allele carriers.
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Affiliation(s)
- Rui Hao
- Laboratory of Neuronal Circuit & Neuroplasticity, Department of Neurology, Tongji Hospital, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yu Qi
- Laboratory of Neuronal Circuit & Neuroplasticity, Department of Neurology, Tongji Hospital, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Dong-Ni Hou
- Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yuan-Yuan Ji
- Neurodegeneration Discovery Performance Unit, GlaxoSmithKline (China) R&D, Shanghai, China
| | - Chun-Yan Zheng
- Neurodegeneration Discovery Performance Unit, GlaxoSmithKline (China) R&D, Shanghai, China
| | - Chu-Yu Li
- Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Wing-Ho Yung
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Bai Lu
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, China
| | - Ying Huang
- Laboratory of Neuronal Circuit & Neuroplasticity, Department of Neurology, Tongji Hospital, Shanghai, China.,Department of Physiology and Pharmacology, Tongji University School of Medicine, Shanghai, China.,Department of Physiology and Pathophysiology, Shanghai Medical College, Fudan University, Shanghai, China
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Gwynne RM, Clarke AJ, Furness JB, Bornstein JC. Both exogenous 5-HT and endogenous 5-HT, released by fluoxetine, enhance distension evoked propulsion in guinea-pig ileum in vitro. Front Neurosci 2014; 8:301. [PMID: 25285066 PMCID: PMC4168689 DOI: 10.3389/fnins.2014.00301] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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: 07/02/2014] [Accepted: 09/03/2014] [Indexed: 12/11/2022] Open
Abstract
The roles of 5-HT3 and 5-HT4 receptors in the modulation of intestinal propulsion by luminal application of 5-HT and augmentation of endogenous 5-HT effects were studied in segments of guinea-pig ileum in vitro. Persistent propulsive contractions evoked by saline distension were examined using a modified Trendelenburg method. When 5-HT (30 nM), fluoxetine (selective serotonin reuptake inhibitor; 1 nM), 2-methyl-5-HT (5-HT3 receptor agonist; 1 mM), or RS 67506 (5-HT4 receptor agonist, 1 μM) was infused into the lumen, the pressure needed to initiate persistent propulsive activity fell significantly. A specific 5-HT4 receptor antagonist, SB 207266 (10 nM in lumen), abolished the effects of 5-HT, fluoxetine, and RS 67506, but not those of 2-methyl-5-HT. Granisetron (5-HT3 receptor antagonist; 1 μM in lumen) abolished the effect of 5-HT, fluoxetine, RS 67506, and 2-methyl-5-HT. The NK3 receptor antagonist SR 142801 (100 nM in lumen) blocked the effects of 5-HT, fluoxetine, and 2-methyl-5-HT. SB 207266, granisetron, and SR 142801 had no effect by themselves. Higher concentrations of fluoxetine (100 and 300 nM) and RS 67506 (3 and 10 μM) had no effect on the distension threshold for propulsive contractions. These results indicate that luminal application of exogenous 5-HT, or increased release of endogenous mucosal 5-HT above basal levels, acts to lower the threshold for propulsive contractions in the guinea-pig ileum via activation of 5-HT3 and 5-HT4 receptors and the release of tachykinins. The results further indicate that basal release of 5-HT is insufficient to alter the threshold for propulsive motor activity.
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Affiliation(s)
- Rachel M Gwynne
- Department of Physiology, University of Melbourne Parkville, VIC, Australia
| | - Amanda J Clarke
- Department of Physiology, University of Melbourne Parkville, VIC, Australia
| | - John B Furness
- Departments of Anatomy and Cell Biology, University of Melbourne Parkville, VIC, Australia
| | - Joel C Bornstein
- Department of Physiology, University of Melbourne Parkville, VIC, Australia
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Puzerey PA, Decker MJ, Galán RF. Elevated serotonergic signaling amplifies synaptic noise and facilitates the emergence of epileptiform network oscillations. J Neurophysiol 2014; 112:2357-73. [PMID: 25122717 DOI: 10.1152/jn.00031.2014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Serotonin fibers densely innervate the cortical sheath to regulate neuronal excitability, but its role in shaping network dynamics remains undetermined. We show that serotonin provides an excitatory tone to cortical neurons in the form of spontaneous synaptic noise through 5-HT3 receptors, which is persistent and can be augmented using fluoxetine, a selective serotonin re-uptake inhibitor. Augmented serotonin signaling also increases cortical network activity by enhancing synaptic excitation through activation of 5-HT2 receptors. This in turn facilitates the emergence of epileptiform network oscillations (10-16 Hz) known as fast runs. A computational model of cortical dynamics demonstrates that these two combined mechanisms, increased background synaptic noise and enhanced synaptic excitation, are sufficient to replicate the emergence fast runs and their statistics. Consistent with these findings, we show that blocking 5-HT2 receptors in vivo significantly raises the threshold for convulsant-induced seizures.
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Affiliation(s)
- Pavel A Puzerey
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio; and
| | - Michael J Decker
- School of Nursing, Case Western Reserve University, Cleveland, Ohio
| | - Roberto F Galán
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio; and
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Fung C, Ellis M, Bornstein JC. Luminal Cholera Toxin Alters Motility in Isolated Guinea-Pig Jejunum via a Pathway Independent of 5-HT(3) Receptors. Front Neurosci 2010; 4:162. [PMID: 21048896 PMCID: PMC2967348 DOI: 10.3389/fnins.2010.00162] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [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: 05/01/2010] [Accepted: 08/16/2010] [Indexed: 12/17/2022] Open
Abstract
Cholera toxin (CT) is well established to produce diarrhea by producing hyperactivity of the enteric neural circuits that regulate water and electrolyte secretion. Its effects on intestinal motor patterns are less well understood. We examined the effects of luminal CT on motor activity of guinea-pig jejunum in vitro. Segments of jejunum were cannulated at either end and mounted horizontally. Their contractile activity was video-imaged and the recordings were used to construct spatiotemporal maps of contractile activity with CT (1.25 or 12.5 μg/ml) in the lumen. Both concentrations of CT induced propulsive motor activity in jejunal segments. The effect of 1.25 μg/ml CT was markedly enhanced by co-incubation with granisetron (5-HT3 antagonist, 1 μM), which prevents the hypersecretion induced by CT. The increased propulsive activity was not accompanied by increased segmentation and occurred very early after exposure to CT in the presence of granisetron. Luminal CT also reduced the pressure threshold for saline distension evoked propulsive reflexes, an effect resistant to granisetron. In contrast, CT prevented the induction of segmenting contractions by luminal decanoic acid, so its effects on propulsive and segmenting contractile activity are distinctly different. Thus, in addition to producing hypersecretion, CT excites propulsive motor activity with an entirely different time course and pharmacology, but inhibits nutrient-induced segmentation. This suggests that CT excites more than one enteric neural circuit and that propulsive and segmenting motor patterns are differentially regulated.
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Affiliation(s)
- Candice Fung
- Department of Physiology, University of Melbourne Parkville, VIC, Australia
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