It has been reported that augmentative effect of tetrandrine on pentobarbital hypnosis in mice may be related to serotonergic system. The present study was undertaken to investigate the interaction of tetrandrine and ...It has been reported that augmentative effect of tetrandrine on pentobarbital hypnosis in mice may be related to serotonergic system. The present study was undertaken to investigate the interaction of tetrandrine and different 5-HT receptors on pentobarbital-induced sleep by using the loss-of-righting reflex method. The results showed that augmentative effect of tetrandrine on pentobarbital hypnosis in mice were potentiated by the p-MPPI (5-HT1A receptor antagonist) (1 mg/kg, i.p.) and ketanserin (5-HT2A/2C receptor antagonist) (1.5 mg/kg, i.p.), respectively. Pretreatment with either 8-OH-DPAT (5-HT1A receptor agonist) (0.1 mg/kg, s.c.) or DOI (5-HT2A/2C receptor agonist) (0.2 mg/kg, i.p.) significantly decreased pentobarbital-induced sleep time, and tetrandrine (60 mg/kg, i.g.) significantly reversed this effect. These results suggest that both the 5-HTLA and 5-HT2A/2C subfamily may be involved in the potentiating mechanism of tetrandrine's effects on pantobarbital hypnosis.展开更多
Objective To outline the recent progress in drug discovery for medication-induced dyskinesia(Parkinson disease,PD)and tardive diskinesia(schizophrenia)with emphasizing the role of 5-HT1A receptor.Methods Development o...Objective To outline the recent progress in drug discovery for medication-induced dyskinesia(Parkinson disease,PD)and tardive diskinesia(schizophrenia)with emphasizing the role of 5-HT1A receptor.Methods Development of extrapyramidal syndrome(EPS)followed either chronic L-DOPA administration in PD(L-DOPA-induced dyskinesia,LID)or antipsychotic treatment in schizophrenia(Tardive dyskinesia,TD)remains a challenge in the clinical practice and drug discovery.In addition to the abnormal dopamine activity in the nigrostrial area that contributes to the LID or TD,recent information indicates that 5-HT1A receptor also plays an important role which is merging as promising target in treatment of LID or TD.Results l-Stepholidine(l-SPD),isolated from the Chinese herb Stephania,is known as a dual dopamine receptor agent(D1 receptor agonistic and D2 antagonistic activity).In addition,we further demonstrated that l-SPD binds to 5-HT1A receptor and exhibits a partial agonistic activity.In LID rat model,l-SPD not only attenuated the development of L-DOPA-induced dyskinesia(LID),but also relived the established LID.The effect of l-SPD on LID was completely blocked by pretreatment of 5-HT1A receptor antagonist,indicating the role of 5-HT1A receptor.Furthermore,we designed and synthesis a dual dopamine/5-HT1A receptor agonist MCL-135,which also exhibits a significant relief on LID while elicits its antiparkinsonian action.Conclusions 5-HT1A receptor plys an important role in the development of LID,targeted to dual dopamine/5-HT receptor may represent a promising strategy for drug design and discovery in LID and TD treatment.展开更多
Rivastigmine, a dual acetylcholinesterase and butyrylcholinesterase inhibitor, is used for symptomatic treatment of patients with mild to moderately severe dementia in Alzheimer’s disease (AD) patients. In the presen...Rivastigmine, a dual acetylcholinesterase and butyrylcholinesterase inhibitor, is used for symptomatic treatment of patients with mild to moderately severe dementia in Alzheimer’s disease (AD) patients. In the present study, we found that 5-HT1A receptor (5-HT1AR) is downregulated, whereas 5-HT2A receptor (5-HT2AR) is upregulated in the hippocampal dentate gyrus (DG) and CA1 region by olfactory bulbectomy (OBX) in mice. Furthermore, chronic treatment with rivastigmine (1.0 mg/kg) for 2 weeks starting 2 weeks after OBX operation restored the decreased 5-HT1AR and the increased 5-HT2AR levels. To determine whether cholinergic receptor stimulation by rivastigmine is involved in the rivastigmine-induced regulation of 5-HTR levels, we treated the mice with mecamylamine (2.5 mg/kg), or atropine (5.0 mg/kg) with rivastigmine (1.0 mg/kg) once a day for 2 weeks. Notably, the rivastigmine-induced 5-HT1AR upregulation was eliminated by mecamylamine but not by atropine treatments. On the other hand, the restored 5-HT2AR level by rivastigmine was not affected by either mecamylamine or atropine. Treatment with 8-OH-DPAT, a selective 5-HT1AR agonist improved the decreased 5-HT1AR and the increased 5-HT2AR levels in OBX mice. On the other hand, treatment with TCB-2, a potent 5-HT2AR agonist had no effects on the 5-HT1AR and 5-HT2AR dysregulation in OBX mice. Taken together, nicotinic acetylcholine receptor (nAChR) stimulation mediates rivastigmine-induced upregulation of 5-HT1AR. Therefore, we speculate that the increased ACh levels by rivastigmine can stimulate nAChR located on serotonergic nerve terminals and stimulate 5-HT1AR by the enhanced 5-HT release in the hippocampus. The 5-HT1AR stimulation likely mediates the improvement of 5-HT1AR levels as auto-receptor in OBX hippocampus.展开更多
The present study examines the effects of serotonin (5-HT) 1A receptor ligands on humoral im-mune response in two rat lines selected for over 75 generations for the enhancement or elimination of aggression. Activation...The present study examines the effects of serotonin (5-HT) 1A receptor ligands on humoral im-mune response in two rat lines selected for over 75 generations for the enhancement or elimination of aggression. Activation of presynaptic 5-HT1A receptors with a low dose of the selective 5-HT1A receptor agonist 8-OH-DPAT (0.1 mg/kg) or the blockade of postsynaptic 5-HT1A receptors with the antagonist WAY-100635 (1.0 mg/kg) did not affect the numbers of IgM-antibody forming cells (IgM-AFC) in the spleen of highly aggressive rats, which were characterized by higher immune responsiveness compared to nonaggressive line. On the other hand, the same doses of 8-OH-DPAT and WAY-100635, as well as a higher dose of 8-OH-DPAT (1.0 mg/kg), which is known to activate postsynaptic 5-HT1A receptors, produce immunostimulation in nonaggressive rats. However, only the highest dose of 8-OH-DPAT (5.0 mg/kg) was able to cause immunosuppression in nonaggressive rats that was mainly dependent on stimulation of postsynaptic 5-HT1A receptors. In contrast to nonaggressive rats, the dose of 1.0 mg/kg 8-OH-DPAT was sufficient to produce a decrease in the numbers of IgM-AFC in highly aggressive rats. Thus, pharmacological activation of pre- and postsynaptic 5-HT1A receptors, as well as the blockade of postsynaptic 5-HT1A receptors, produced different effects on the immune response in two lines of rats selected for high level of aggression or its absence. These data may have implications for more efficient treatments of a number of mental disorders associated with abnormal aggression.展开更多
Hypidone hydrochloride(YL-0919),the 5-HT1A/6 agonists and 5-HT reuptake inhibitor,is a novel potent antidepressant with original chemical structure.Previous studies confirmed that YL-0919 has significant antidepressan...Hypidone hydrochloride(YL-0919),the 5-HT1A/6 agonists and 5-HT reuptake inhibitor,is a novel potent antidepressant with original chemical structure.Previous studies confirmed that YL-0919 has significant antidepressant-and anxiolytic-like effects.Compared with first-line antidepressants,YL-0919 possesses rapid-onset and cognition-enhancing advantages without causing sexual disorders.Recently,it has been found that it has high affinity with 5-HT6 receptor.Objective:To study the target characteristics of YL-0919 to 5-HT6 receptors,and to explore the relationship between the 5-HT6 receptor and the cognition-enhancing,antidepressant/anxiolytic-like effects of YL-0919 and targeting mechanisms.Methods:The radioligand binding inhibition test and[35S]-GTPγS binding assay were used to evaluate the binding affinity of YL-0919 to 5-HT6 receptor in rat striatum,transient CHO cell line and stable Hela cell lines.Novel object recognition(NOR),Morris water maze(MWM)and step-down test(SD)were used to evaluate the cognition-enhancing activity of YL-0919,and the selective 5-HT6 receptor antagonist SB271046 was used to evaluate the relationship between behavioral improvement caused by YL-0919 and 5-HT6 receptor activation.To study the 5-HT6 receptor related mechanisms of YL-0919,the competitive immunofluorescence assay were used to examine the cAMP level in h5-HT6 receptor-expressed in the Hela cells Results:①Radioligand competitive binding experiments showed that YL-0919 had high binding affinity with 5-HT6 receptors in the rat striatum,the CHO cells transiently expressed the h5-HT6 receptor and the Hela cells stably expressed the h5-HT6 receptor,with Ki of 10.72,14.76 and 28.12 nM respectively;[35S]-GTPγS showed full agonist characteristics of YL-0919 in striatum and cells,with EC50 of 71.23,64.73 and 52.92 nM respectively,and the maximum efficiency(Emax)reached 100%which is the same to the 5-HT6 receptor agonist WAY208466,suggesting that YL-0919 is a full 5-HT6 receptor agonist.②Cognitive-related behavioral tests showed that subchronic oral administration of YL-0919(1.25~2.5 mg·kg-1)could significantly increase the recognition index in NOR,the entries and duration in the target quadrant,the entries crossing the platform in WMW,shortened the first time crossing the platform in MWM and the step-down latency in SD,suggesting the cognitionenhancing effects of YL-0919;compared with Vilazodone,the partial agonist of 5-HT1A receptor and 5-HT reuptake inhibitor,which of no such functions;Further study showed that 5-HT6 receptor antagonist SB271046(10 mg·kg-1)completely blocked the cognition-enhancing effects of YL-0919 without affecting the cognitive activity itself,suggesting that 5-HT6 receptor activation might be its underlying mechanisms;③Mechanism study found that YL-0919 could significantly increase cAMP levels in the Hela cells stably-expressed the h5-HT6 receptor,which could be dose-dependent blocked by SB271046.Conclusion:YL-0919 is a full agonist of 5-HT6 receptor.YL-0919 showed significant cognition-enhancing effects in various kinds of animal models,and its underlying important mechanism might be activating 5-HT6 receptor.In addition,enhancing downstream cAMP-CREB signaling pathway of 5-HT6 receptor might at least partially mediate the above process.Moreover,5-HT6 receptor activation might also be one of the mechanisms of antidepressant-and anxiolytic-like effects of YL-0919.In conclusion,this study confirmed the 5-HT6 receptor-related mechanisms of YL-0919,the 1.1 types of antidepressants,laying the experimental foundation for developing novel antidepressants with cognition-enhancing effects.展开更多
A series of 3-(4-arylpiperazin-1-yl)-1-(benzo[b]thiophen-3-yl)-2-methylpropanol derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies.The synthesized compounds were evaluated for t...A series of 3-(4-arylpiperazin-1-yl)-1-(benzo[b]thiophen-3-yl)-2-methylpropanol derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies.The synthesized compounds were evaluated for their dual 5-HT1A/5-HTT activities.展开更多
The design, synthesis and biological evaluation of N-(2-(2-methoxyphenylthio) benzyl)-2-aryloxyethyl amines with dual 5-HT1A/SSR/activities are reported. Compound 8e displays the best dual activities and is a prom...The design, synthesis and biological evaluation of N-(2-(2-methoxyphenylthio) benzyl)-2-aryloxyethyl amines with dual 5-HT1A/SSR/activities are reported. Compound 8e displays the best dual activities and is a promising lead compound for further SAR studies.展开更多
The design, synthesis and biological evaluation of a novel series of arylpiperazine derivatives of diphenylsulfide with dual 5- HT1A/SSRI activities are reported. The target compounds exhibit low to moderate 5-HT tran...The design, synthesis and biological evaluation of a novel series of arylpiperazine derivatives of diphenylsulfide with dual 5- HT1A/SSRI activities are reported. The target compounds exhibit low to moderate 5-HT transporter affinity and moderate to high 5- HT1A affinity, Compound 13a shows moderate dual activities and is a promising lead compound for further structure-activity relationships studies.展开更多
A series of 1-[2-(2-methoxyphenylthio) benzyl]-4-arylpiperazines derivatives was designed and synthesized based on 5-HT1A/ SSRI drugs design strategies. The synthesized compounds were evaluated for their dual 5-HT1A...A series of 1-[2-(2-methoxyphenylthio) benzyl]-4-arylpiperazines derivatives was designed and synthesized based on 5-HT1A/ SSRI drugs design strategies. The synthesized compounds were evaluated for their dual 5-HT1A/5-HTT activities. 2007 Ai Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
A series of 1-(N-(2-(2-methoxyphenylthio)benzyl)-N-methylamino-3-aryloxypropan-2-ols derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies. The synthesized compounds were evaluate...A series of 1-(N-(2-(2-methoxyphenylthio)benzyl)-N-methylamino-3-aryloxypropan-2-ols derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies. The synthesized compounds were evaluated for their dual 5-HT1A/ 5-HTT activities. 2007 Ai Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
This study investigated the modulatory effect of synthetic cannabinoids WIN55,212-2 on 5-HT3 receptor-activated currents (I5-HT3) in cultured rat trigeminal ganglion (TG) neurons using whole-cell patch clamp technique...This study investigated the modulatory effect of synthetic cannabinoids WIN55,212-2 on 5-HT3 receptor-activated currents (I5-HT3) in cultured rat trigeminal ganglion (TG) neurons using whole-cell patch clamp technique. The results showed that: (1) The majority of examined neurons (78.70%) were sensitive to 5-HT (3–300 μmol/L). 5-HT induced inward currents in a concentration-dependent manner and the currents were blocked by ICS 205-930 (1 μmol/L), a selective antagonist of the 5-HT3 receptor; (2) Pre-application of WIN55,212-2 (0.01–1 μmol/L) significantly inhibited I5-HT3 reversibly in concentration-dependent and voltage-independent manners. The concentra-tion-response curve of 5-HT3 receptor was shifted downward by WIN55,212-2 without any change of the threshold value. The EC50 values of two curves were very close (17.5±4.5) mmol/L vs. (15.2±4.5) mmol/L and WIN55,212-2 decreased the maximal amplitude of I5-HT3 by (48.65±4.15)%; (3) Neither AM281, a selective CB1 receptor antagonist, nor AM630, a selective CB2 receptor antagonist reversed the inhibition of I5-HT3 by WIN55,212-2; (4) When WIN55,212-2 was given from 15 to 120 s before 5-HT application, inhibitory effect was gradually increased and the maximal inhibition took place at 90 s, and the inhibition remained at the same level after 90 s. We are led to concluded that-WIN55,212-2 inhibited I5-HT3 significantly and neither CB1 receptor antagonist nor CB2 receptor antagonist could reverse the inhibition of I5-HT3 by WIN55,212-2. Moreover, WIN55,212-2 is not an open channel blocker (OCB) of 5-HT3 receptor. WIN55,212-2 significantly inhibited 5-HT-activated currents in a non-competitive manner. The inhibition of I5-HT3 by WIN55,212-2 is probably new one of peripheral analgesic mechanisms of WIN55,212-2, but the mechanism by which WIN55,212-2 inhibits I5-HT3 warrants further investigation.展开更多
Background: 5-HT4receptors in cortex and hippocampus area are considered as a possible target for modulation of cognitive functions in Alzheimer’s disease (AD). A systems pharmacology approach was adopted to evaluate...Background: 5-HT4receptors in cortex and hippocampus area are considered as a possible target for modulation of cognitive functions in Alzheimer’s disease (AD). A systems pharmacology approach was adopted to evaluate the potential of the 5-HT4 modulation in providing beneficialeffects on cognition in AD. Methods: A serotonergic synaptic cleft model was developed by integrating serotonin firing, release, synaptic half-life, drug/tracer properties (affinity and agonism) as inputs and5-HT4 activity as output. The serotonergic model was calibrated using bothinvivo data on free 5-HT levels in preclinical models and human imaging data. The model was further expanded to other neurontransmitter systems and incorporated into a computer-based cortical network model which implemented the physiology of 12 different membrane CNS targets. A biophysically realistic, multi-compartment model of 80 pyramidal cells and 40 interneurons was further calibrated usingdata reported for working memory tasks in healthyhumans and schizophrenia patients. Model output was the duration of the network firing activity in response to an external stimulus. Alzheimer’s disease (AD) pathology, in particular synapse and neuronal cell loss in addition to cholinergic deficits, was calibrated to align with the natural clinical disease progression. The model was used to provide insights into the effect of 5-HT4 activation on working memory and to prospectively simulate the response of PF- 04995274, a 5-HT4partial agonist, in a scopolamine-reversal trial in healthy human subjects. Results: The model output suggested a beneficial effect of 5-HT4 agonism on working memory. The model also projected no effect or an exacerbation of scopolamine impairment for low in- trinsic activity 5-HT4agonists, which was supported by the subsequent human trial outcome. The clinical prediction of the disease model strongly suggests that 5-HT4 agonists with high intrinsic activity may have a beneficial effect on cognition in AD patients.展开更多
Early appearance of the serotonergic system in the fetal brain and the various effects of serotonin (5-HT) on brain morphogenesis, have given support to a neurotrophic role of serotonin. This function of serotonin is ...Early appearance of the serotonergic system in the fetal brain and the various effects of serotonin (5-HT) on brain morphogenesis, have given support to a neurotrophic role of serotonin. This function of serotonin is accomplished through a system of serotonin nerve terminals in the target regions that involves various 5-HT receptors. In visual, auditory and somatosensory cortex an early and intense serotonergic innervation is particularly important. The neuronal somata of these terminals are normally located in the mesencephalon and they have not been observed in the maturing cerebral cortex, neither in the adult brain. By using immunolabeling techniques, fluorescence and confocal microscopy, we observe the presence of both, 5-HT terminals and 5-HT cells in mesencephalon (Me, E17) and in the neopallium (Np, E13-E16) cocultures. Cells immunopositive to 5-HT and to tryptophan-5-hydroxilase are also observed in the Np on day 12 of culture. These results concerning the unexpected presence of serotonergic cells in the fetal cerebral cortex are interesting and may be of importance in corticogenesis. As it happens with other elements of the serotonergic system, the presence of these phenotypically serotonergic cells in the early cerebral cortex may be transitory and probably supporting cortex maturation processes. The molecular signaling path of the 5-HT1A receptor has also been identified.展开更多
5-HT1A receptor is a crucial therapeutic target for the treatment of anxiety, depression, pain, etc. Design and preparation of potent 5-HT1A receptor ligands for drug discovery has attracted extensive attention in the...5-HT1A receptor is a crucial therapeutic target for the treatment of anxiety, depression, pain, etc. Design and preparation of potent 5-HT1A receptor ligands for drug discovery has attracted extensive attention in the past few years. In this paper, a three dimensional model of human 5-HT1A receptor was constructed by means of homology modeling. And the docking of MP349 to the receptor suggested a reliable binding mode for 5-HT1A receptor ligand. Based on this ligand-receptor binding mode, an elaborate receptor structure based pharmacophore model was established, which revealed many important features responsible for ligand and 5-HT1A receptor interactions. A virtual screening experiment verified the ability of this pharmacophore model to discover true 5-HT1A receptor ligand. The results of this research would provide important information for further optimizations of 5-HT1A receptor ligands and guide related new lead discoveries.展开更多
基金National Natural Science Foundation of China(Grant No.30772556 and 30640070)Research Fund of Janssen Research Council and the‘985'Project in Peking University.
文摘It has been reported that augmentative effect of tetrandrine on pentobarbital hypnosis in mice may be related to serotonergic system. The present study was undertaken to investigate the interaction of tetrandrine and different 5-HT receptors on pentobarbital-induced sleep by using the loss-of-righting reflex method. The results showed that augmentative effect of tetrandrine on pentobarbital hypnosis in mice were potentiated by the p-MPPI (5-HT1A receptor antagonist) (1 mg/kg, i.p.) and ketanserin (5-HT2A/2C receptor antagonist) (1.5 mg/kg, i.p.), respectively. Pretreatment with either 8-OH-DPAT (5-HT1A receptor agonist) (0.1 mg/kg, s.c.) or DOI (5-HT2A/2C receptor agonist) (0.2 mg/kg, i.p.) significantly decreased pentobarbital-induced sleep time, and tetrandrine (60 mg/kg, i.g.) significantly reversed this effect. These results suggest that both the 5-HTLA and 5-HT2A/2C subfamily may be involved in the potentiating mechanism of tetrandrine's effects on pantobarbital hypnosis.
文摘Objective To outline the recent progress in drug discovery for medication-induced dyskinesia(Parkinson disease,PD)and tardive diskinesia(schizophrenia)with emphasizing the role of 5-HT1A receptor.Methods Development of extrapyramidal syndrome(EPS)followed either chronic L-DOPA administration in PD(L-DOPA-induced dyskinesia,LID)or antipsychotic treatment in schizophrenia(Tardive dyskinesia,TD)remains a challenge in the clinical practice and drug discovery.In addition to the abnormal dopamine activity in the nigrostrial area that contributes to the LID or TD,recent information indicates that 5-HT1A receptor also plays an important role which is merging as promising target in treatment of LID or TD.Results l-Stepholidine(l-SPD),isolated from the Chinese herb Stephania,is known as a dual dopamine receptor agent(D1 receptor agonistic and D2 antagonistic activity).In addition,we further demonstrated that l-SPD binds to 5-HT1A receptor and exhibits a partial agonistic activity.In LID rat model,l-SPD not only attenuated the development of L-DOPA-induced dyskinesia(LID),but also relived the established LID.The effect of l-SPD on LID was completely blocked by pretreatment of 5-HT1A receptor antagonist,indicating the role of 5-HT1A receptor.Furthermore,we designed and synthesis a dual dopamine/5-HT1A receptor agonist MCL-135,which also exhibits a significant relief on LID while elicits its antiparkinsonian action.Conclusions 5-HT1A receptor plys an important role in the development of LID,targeted to dual dopamine/5-HT receptor may represent a promising strategy for drug design and discovery in LID and TD treatment.
文摘Rivastigmine, a dual acetylcholinesterase and butyrylcholinesterase inhibitor, is used for symptomatic treatment of patients with mild to moderately severe dementia in Alzheimer’s disease (AD) patients. In the present study, we found that 5-HT1A receptor (5-HT1AR) is downregulated, whereas 5-HT2A receptor (5-HT2AR) is upregulated in the hippocampal dentate gyrus (DG) and CA1 region by olfactory bulbectomy (OBX) in mice. Furthermore, chronic treatment with rivastigmine (1.0 mg/kg) for 2 weeks starting 2 weeks after OBX operation restored the decreased 5-HT1AR and the increased 5-HT2AR levels. To determine whether cholinergic receptor stimulation by rivastigmine is involved in the rivastigmine-induced regulation of 5-HTR levels, we treated the mice with mecamylamine (2.5 mg/kg), or atropine (5.0 mg/kg) with rivastigmine (1.0 mg/kg) once a day for 2 weeks. Notably, the rivastigmine-induced 5-HT1AR upregulation was eliminated by mecamylamine but not by atropine treatments. On the other hand, the restored 5-HT2AR level by rivastigmine was not affected by either mecamylamine or atropine. Treatment with 8-OH-DPAT, a selective 5-HT1AR agonist improved the decreased 5-HT1AR and the increased 5-HT2AR levels in OBX mice. On the other hand, treatment with TCB-2, a potent 5-HT2AR agonist had no effects on the 5-HT1AR and 5-HT2AR dysregulation in OBX mice. Taken together, nicotinic acetylcholine receptor (nAChR) stimulation mediates rivastigmine-induced upregulation of 5-HT1AR. Therefore, we speculate that the increased ACh levels by rivastigmine can stimulate nAChR located on serotonergic nerve terminals and stimulate 5-HT1AR by the enhanced 5-HT release in the hippocampus. The 5-HT1AR stimulation likely mediates the improvement of 5-HT1AR levels as auto-receptor in OBX hippocampus.
文摘The present study examines the effects of serotonin (5-HT) 1A receptor ligands on humoral im-mune response in two rat lines selected for over 75 generations for the enhancement or elimination of aggression. Activation of presynaptic 5-HT1A receptors with a low dose of the selective 5-HT1A receptor agonist 8-OH-DPAT (0.1 mg/kg) or the blockade of postsynaptic 5-HT1A receptors with the antagonist WAY-100635 (1.0 mg/kg) did not affect the numbers of IgM-antibody forming cells (IgM-AFC) in the spleen of highly aggressive rats, which were characterized by higher immune responsiveness compared to nonaggressive line. On the other hand, the same doses of 8-OH-DPAT and WAY-100635, as well as a higher dose of 8-OH-DPAT (1.0 mg/kg), which is known to activate postsynaptic 5-HT1A receptors, produce immunostimulation in nonaggressive rats. However, only the highest dose of 8-OH-DPAT (5.0 mg/kg) was able to cause immunosuppression in nonaggressive rats that was mainly dependent on stimulation of postsynaptic 5-HT1A receptors. In contrast to nonaggressive rats, the dose of 1.0 mg/kg 8-OH-DPAT was sufficient to produce a decrease in the numbers of IgM-AFC in highly aggressive rats. Thus, pharmacological activation of pre- and postsynaptic 5-HT1A receptors, as well as the blockade of postsynaptic 5-HT1A receptors, produced different effects on the immune response in two lines of rats selected for high level of aggression or its absence. These data may have implications for more efficient treatments of a number of mental disorders associated with abnormal aggression.
文摘Hypidone hydrochloride(YL-0919),the 5-HT1A/6 agonists and 5-HT reuptake inhibitor,is a novel potent antidepressant with original chemical structure.Previous studies confirmed that YL-0919 has significant antidepressant-and anxiolytic-like effects.Compared with first-line antidepressants,YL-0919 possesses rapid-onset and cognition-enhancing advantages without causing sexual disorders.Recently,it has been found that it has high affinity with 5-HT6 receptor.Objective:To study the target characteristics of YL-0919 to 5-HT6 receptors,and to explore the relationship between the 5-HT6 receptor and the cognition-enhancing,antidepressant/anxiolytic-like effects of YL-0919 and targeting mechanisms.Methods:The radioligand binding inhibition test and[35S]-GTPγS binding assay were used to evaluate the binding affinity of YL-0919 to 5-HT6 receptor in rat striatum,transient CHO cell line and stable Hela cell lines.Novel object recognition(NOR),Morris water maze(MWM)and step-down test(SD)were used to evaluate the cognition-enhancing activity of YL-0919,and the selective 5-HT6 receptor antagonist SB271046 was used to evaluate the relationship between behavioral improvement caused by YL-0919 and 5-HT6 receptor activation.To study the 5-HT6 receptor related mechanisms of YL-0919,the competitive immunofluorescence assay were used to examine the cAMP level in h5-HT6 receptor-expressed in the Hela cells Results:①Radioligand competitive binding experiments showed that YL-0919 had high binding affinity with 5-HT6 receptors in the rat striatum,the CHO cells transiently expressed the h5-HT6 receptor and the Hela cells stably expressed the h5-HT6 receptor,with Ki of 10.72,14.76 and 28.12 nM respectively;[35S]-GTPγS showed full agonist characteristics of YL-0919 in striatum and cells,with EC50 of 71.23,64.73 and 52.92 nM respectively,and the maximum efficiency(Emax)reached 100%which is the same to the 5-HT6 receptor agonist WAY208466,suggesting that YL-0919 is a full 5-HT6 receptor agonist.②Cognitive-related behavioral tests showed that subchronic oral administration of YL-0919(1.25~2.5 mg·kg-1)could significantly increase the recognition index in NOR,the entries and duration in the target quadrant,the entries crossing the platform in WMW,shortened the first time crossing the platform in MWM and the step-down latency in SD,suggesting the cognitionenhancing effects of YL-0919;compared with Vilazodone,the partial agonist of 5-HT1A receptor and 5-HT reuptake inhibitor,which of no such functions;Further study showed that 5-HT6 receptor antagonist SB271046(10 mg·kg-1)completely blocked the cognition-enhancing effects of YL-0919 without affecting the cognitive activity itself,suggesting that 5-HT6 receptor activation might be its underlying mechanisms;③Mechanism study found that YL-0919 could significantly increase cAMP levels in the Hela cells stably-expressed the h5-HT6 receptor,which could be dose-dependent blocked by SB271046.Conclusion:YL-0919 is a full agonist of 5-HT6 receptor.YL-0919 showed significant cognition-enhancing effects in various kinds of animal models,and its underlying important mechanism might be activating 5-HT6 receptor.In addition,enhancing downstream cAMP-CREB signaling pathway of 5-HT6 receptor might at least partially mediate the above process.Moreover,5-HT6 receptor activation might also be one of the mechanisms of antidepressant-and anxiolytic-like effects of YL-0919.In conclusion,this study confirmed the 5-HT6 receptor-related mechanisms of YL-0919,the 1.1 types of antidepressants,laying the experimental foundation for developing novel antidepressants with cognition-enhancing effects.
基金supported by the National Natural Science Foundation of China(No.20576094).
文摘A series of 3-(4-arylpiperazin-1-yl)-1-(benzo[b]thiophen-3-yl)-2-methylpropanol derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies.The synthesized compounds were evaluated for their dual 5-HT1A/5-HTT activities.
文摘The design, synthesis and biological evaluation of N-(2-(2-methoxyphenylthio) benzyl)-2-aryloxyethyl amines with dual 5-HT1A/SSR/activities are reported. Compound 8e displays the best dual activities and is a promising lead compound for further SAR studies.
文摘The design, synthesis and biological evaluation of a novel series of arylpiperazine derivatives of diphenylsulfide with dual 5- HT1A/SSRI activities are reported. The target compounds exhibit low to moderate 5-HT transporter affinity and moderate to high 5- HT1A affinity, Compound 13a shows moderate dual activities and is a promising lead compound for further structure-activity relationships studies.
基金This work was supported by the National Natural Science Foundation of China (No. 20576094).
文摘A series of 1-[2-(2-methoxyphenylthio) benzyl]-4-arylpiperazines derivatives was designed and synthesized based on 5-HT1A/ SSRI drugs design strategies. The synthesized compounds were evaluated for their dual 5-HT1A/5-HTT activities. 2007 Ai Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
基金This work was supported by the National Natural Science Foundation of China (No. 20576094).
文摘A series of 1-(N-(2-(2-methoxyphenylthio)benzyl)-N-methylamino-3-aryloxypropan-2-ols derivatives were designed and synthesized based on 5-HT1A/SSRI drugs design strategies. The synthesized compounds were evaluated for their dual 5-HT1A/ 5-HTT activities. 2007 Ai Jun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
基金supported by National Natural Science Foundation of China(No.30271500)Science and Tech-nology Research Project Fund from the Department of Edu-cation of Hubei Province of China(No.B20115101)
文摘This study investigated the modulatory effect of synthetic cannabinoids WIN55,212-2 on 5-HT3 receptor-activated currents (I5-HT3) in cultured rat trigeminal ganglion (TG) neurons using whole-cell patch clamp technique. The results showed that: (1) The majority of examined neurons (78.70%) were sensitive to 5-HT (3–300 μmol/L). 5-HT induced inward currents in a concentration-dependent manner and the currents were blocked by ICS 205-930 (1 μmol/L), a selective antagonist of the 5-HT3 receptor; (2) Pre-application of WIN55,212-2 (0.01–1 μmol/L) significantly inhibited I5-HT3 reversibly in concentration-dependent and voltage-independent manners. The concentra-tion-response curve of 5-HT3 receptor was shifted downward by WIN55,212-2 without any change of the threshold value. The EC50 values of two curves were very close (17.5±4.5) mmol/L vs. (15.2±4.5) mmol/L and WIN55,212-2 decreased the maximal amplitude of I5-HT3 by (48.65±4.15)%; (3) Neither AM281, a selective CB1 receptor antagonist, nor AM630, a selective CB2 receptor antagonist reversed the inhibition of I5-HT3 by WIN55,212-2; (4) When WIN55,212-2 was given from 15 to 120 s before 5-HT application, inhibitory effect was gradually increased and the maximal inhibition took place at 90 s, and the inhibition remained at the same level after 90 s. We are led to concluded that-WIN55,212-2 inhibited I5-HT3 significantly and neither CB1 receptor antagonist nor CB2 receptor antagonist could reverse the inhibition of I5-HT3 by WIN55,212-2. Moreover, WIN55,212-2 is not an open channel blocker (OCB) of 5-HT3 receptor. WIN55,212-2 significantly inhibited 5-HT-activated currents in a non-competitive manner. The inhibition of I5-HT3 by WIN55,212-2 is probably new one of peripheral analgesic mechanisms of WIN55,212-2, but the mechanism by which WIN55,212-2 inhibits I5-HT3 warrants further investigation.
文摘Background: 5-HT4receptors in cortex and hippocampus area are considered as a possible target for modulation of cognitive functions in Alzheimer’s disease (AD). A systems pharmacology approach was adopted to evaluate the potential of the 5-HT4 modulation in providing beneficialeffects on cognition in AD. Methods: A serotonergic synaptic cleft model was developed by integrating serotonin firing, release, synaptic half-life, drug/tracer properties (affinity and agonism) as inputs and5-HT4 activity as output. The serotonergic model was calibrated using bothinvivo data on free 5-HT levels in preclinical models and human imaging data. The model was further expanded to other neurontransmitter systems and incorporated into a computer-based cortical network model which implemented the physiology of 12 different membrane CNS targets. A biophysically realistic, multi-compartment model of 80 pyramidal cells and 40 interneurons was further calibrated usingdata reported for working memory tasks in healthyhumans and schizophrenia patients. Model output was the duration of the network firing activity in response to an external stimulus. Alzheimer’s disease (AD) pathology, in particular synapse and neuronal cell loss in addition to cholinergic deficits, was calibrated to align with the natural clinical disease progression. The model was used to provide insights into the effect of 5-HT4 activation on working memory and to prospectively simulate the response of PF- 04995274, a 5-HT4partial agonist, in a scopolamine-reversal trial in healthy human subjects. Results: The model output suggested a beneficial effect of 5-HT4 agonism on working memory. The model also projected no effect or an exacerbation of scopolamine impairment for low in- trinsic activity 5-HT4agonists, which was supported by the subsequent human trial outcome. The clinical prediction of the disease model strongly suggests that 5-HT4 agonists with high intrinsic activity may have a beneficial effect on cognition in AD patients.
文摘Early appearance of the serotonergic system in the fetal brain and the various effects of serotonin (5-HT) on brain morphogenesis, have given support to a neurotrophic role of serotonin. This function of serotonin is accomplished through a system of serotonin nerve terminals in the target regions that involves various 5-HT receptors. In visual, auditory and somatosensory cortex an early and intense serotonergic innervation is particularly important. The neuronal somata of these terminals are normally located in the mesencephalon and they have not been observed in the maturing cerebral cortex, neither in the adult brain. By using immunolabeling techniques, fluorescence and confocal microscopy, we observe the presence of both, 5-HT terminals and 5-HT cells in mesencephalon (Me, E17) and in the neopallium (Np, E13-E16) cocultures. Cells immunopositive to 5-HT and to tryptophan-5-hydroxilase are also observed in the Np on day 12 of culture. These results concerning the unexpected presence of serotonergic cells in the fetal cerebral cortex are interesting and may be of importance in corticogenesis. As it happens with other elements of the serotonergic system, the presence of these phenotypically serotonergic cells in the early cerebral cortex may be transitory and probably supporting cortex maturation processes. The molecular signaling path of the 5-HT1A receptor has also been identified.
文摘5-HT1A receptor is a crucial therapeutic target for the treatment of anxiety, depression, pain, etc. Design and preparation of potent 5-HT1A receptor ligands for drug discovery has attracted extensive attention in the past few years. In this paper, a three dimensional model of human 5-HT1A receptor was constructed by means of homology modeling. And the docking of MP349 to the receptor suggested a reliable binding mode for 5-HT1A receptor ligand. Based on this ligand-receptor binding mode, an elaborate receptor structure based pharmacophore model was established, which revealed many important features responsible for ligand and 5-HT1A receptor interactions. A virtual screening experiment verified the ability of this pharmacophore model to discover true 5-HT1A receptor ligand. The results of this research would provide important information for further optimizations of 5-HT1A receptor ligands and guide related new lead discoveries.