Maurice T


Full name : Maurice Tangui

First name : Tangui

Mail : INSERM U1198, University of Montpellier, Montpellier

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Country : France

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References (23)

Title : Fluoroethylnormemantine (FENM) shows synergistic protection in combination with a sigma-1 receptor agonist in a mouse model of Alzheimer's disease - Freyssin_2023_Neuropharmacol__109733
Author(s) : Freyssin A , Carles A , Guehairia S , Rubinstenn G , Maurice T
Ref : Neuropharmacology , :109733 , 2023
Abstract : Fluoroethylnormemantine (FENM) is a Memantine derivative with anti-amnesic and neuroprotective activities showed in the Abeta(25-35) pharmacological mouse model of Alzheimer's disease (AD). As AD is a complex multi-factorial neurodegenerative pathology, combination therapies relying on drugs acting through different pathways, have been suggested to more adequately address neuroprotection. As several agonists of the sigma-1 receptor (S1R), an intracellular chaperone, are presently in phase 2 or 3 clinical trials in neurodegenetrative diseases including AD, we examined the potentialities of S1R drug-based combinations with FENM, or Memantine. Abeta(25-35)-treated mice were treated with S1R agonists (PRE-084, Igmesine, Cutamesine) and/or FENM, or Memantine, during 7 days after intracerebroventricular administration of oligomerized Abeta(25-35). Mice were then tested for spatial short-term memory on day 8 and non-spatial long-term memory on days 9-10, using the spontaneous alternation or passive avoidance tests, respectively. The FENM or Memantine combination with Donepezil, that non-selectively inhibits acetylcholinesterase and activates S1R, was also tested. The efficacy of combinations using maximal non-active or minimal active doses of S1R agonist or FENM was analyzed using calculations of the combination index, based on simple isobologram representation. Data showed that most of the FENM-based combinations led to synergistic protection against Abeta(25-35)-induced learning deficits, for both long- and short-term memory responses, with a higher efficiency on the latter. Memantine led to synergistic combination in short-term memory but poorly in long-term memory responses, with either PRE-084 or Donepezil. These study showed that drug combinations based on FENM and S1R agonists may lead to highly effective and synergistic protection in AD, particularly on short-term memory.
ESTHER : Freyssin_2023_Neuropharmacol__109733
PubMedSearch : Freyssin_2023_Neuropharmacol__109733
PubMedID: 37844867

Title : Dual-Acting Small Molecules: Subtype-Selective Cannabinoid Receptor 2 Agonist\/Butyrylcholinesterase Inhibitor Hybrids Show Neuroprotection in an Alzheimer's Disease Mouse Model - Spatz_2023_J.Med.Chem__
Author(s) : Spatz P , Steinmuller SAM , Tutov A , Poeta E , Morilleau A , Carles A , Deventer MH , Hofmann J , Stove CP , Monti B , Maurice T , Decker M
Ref : Journal of Medicinal Chemistry , : , 2023
Abstract : We present the synthesis and characterization of merged human butyrylcholinesterase (hBChE) inhibitor/cannabinoid receptor 2 (hCB(2)R) ligands for the treatment of neurodegeneration. In total, 15 benzimidazole carbamates were synthesized and tested for their inhibition of human cholinesterases, also with regard to their pseudoirreversible binding mode and affinity toward both cannabinoid receptors in radioligand binding studies. After evaluation in a calcium mobilization assay as well as a beta-arrestin 2 (betaarr2) recruitment assay, two compounds with balanced activities on both targets were tested for their immunomodulatory effect on microglia activation and regarding their pharmacokinetic properties and blood-brain barrier penetration. Compound 15d, containing a dimethyl carbamate motif, was further evaluated in vivo, showing prevention of Abeta(25-35)-induced learning impairments in a pharmacological mouse model of Alzheimer's disease for both short- and long-term memory responses. Additional combination studies proved a synergic effect of BChE inhibition and CB(2)R activation in vivo.
ESTHER : Spatz_2023_J.Med.Chem__
PubMedSearch : Spatz_2023_J.Med.Chem__
PubMedID: 37127287

Title : Photoswitchable Pseudoirreversible Butyrylcholinesterase Inhibitors Allow Optical Control of Inhibition in Vitro and Enable Restoration of Cognition in an Alzheimer's Disease Mouse Model upon Irradiation - Scheiner_2022_J.Am.Chem.Soc__
Author(s) : Scheiner M , Sink A , Hoffmann M , Vrigneau C , Endres E , Carles A , Sotriffer C , Maurice T , Decker M
Ref : Journal of the American Chemical Society , : , 2022
Abstract : To develop tools to investigate the biological functions of butyrylcholinesterase (BChE) and the mechanisms by which BChE affects Alzheimer's disease (AD), we synthesized several selective, nanomolar active, pseudoirreversible photoswitchable BChE inhibitors. The compounds were able to specifically influence different kinetic parameters of the inhibition process by light. For one compound, a 10-fold difference in the IC(50)-values (44.6 nM cis, 424 nM trans) in vitro was translated to an "all or nothing" response with complete recovery in a murine cognition-deficit AD model at dosages as low as 0.3 mg/kg.
ESTHER : Scheiner_2022_J.Am.Chem.Soc__
PubMedSearch : Scheiner_2022_J.Am.Chem.Soc__
PubMedID: 35138833

Title : Novel benzimidazole-based pseudo-irreversible butyrylcholinesterase inhibitors with neuroprotective activity in an Alzheimer's disease mouse model - Spatz_2022_RSC.Med.Chem_13_944
Author(s) : Spatz P , Zimmermann T , Steinmuller S , Hofmann J , Maurice T , Decker M
Ref : RSC Med Chem , 13 :944 , 2022
Abstract : As levels of acetylcholinesterase (AChE) decrease while levels of butyrylcholinesterase (BChE) increase in later stages of Alzheimer's disease (AD), BChE stands out as a promising target for treatment of AD. Therefore, several benzimidazole-carbamates were designed based on docking studies to inhibit BChE selectively over AChE, while retaining a reasonable solubility. Synthesized molecules exhibit IC(50) values from 2.4 microM down to 3.7 nM with an overall highly hBChE-selective profile of the designed compound class. After evaluation of potential neurotoxicity, the most promising compound was further investigated in vivo. Compound 11d attenuates Abeta(25-35)-induced learning impairments in both spontaneous alternation and passive avoidance responses at a very low dosage of 0.03 mg kg(-1), proving selective BChE inhibition to lead to effective neuroprotectivity in AD.
ESTHER : Spatz_2022_RSC.Med.Chem_13_944
PubMedSearch : Spatz_2022_RSC.Med.Chem_13_944
PubMedID: 36092149

Title : Synthesis and Biological Evaluation of Flavonoid-Cinnamic Acid Amide Hybrids with Distinct Activity against Neurodegeneration in Vitro and in Vivo - Hofmann_2022_Chemistry__e202200786
Author(s) : Hofmann J , Spatz P , Walther R , Gutmann M , Maurice T , Decker M
Ref : Chemistry , :e202200786 , 2022
Abstract : Flavonoids are polyphenolic natural products and have shown significant potential as disease-modifying agents against neurodegenerative disorders like Alzheimer's disease (AD), with activities even invivo. Hybridization of the natural products taxifolin and silibinin with cinnamic acid led to an overadditive effect of these compounds in several phenotypic screening assays related to neurodegeneration and AD. Therefore, we have exchanged the flavonoid part of the hybrids with different flavonoids, which show higher efficacy than taxifolin or silibinin, to improve the activity of the respective hybrids. Chemical connection between the flavonoid and cinnamic acid was realized by an amide instead of a labile ester bond to improve stability towards hydrolysis. To investigate the influence of a double bond at the C-ring of the flavonoid, the dehydro analogues of the respective hybrids were also synthesized. All compounds obtained show neuroprotection against oxytosis, ferroptosis and ATP-depletion, respectively, in the murine hippocampal cell line HT22. Interestingly, the taxifolin and the quercetin derivatives are the most active compounds, whereby the quercetin derivate shows even more pronounced activity than the taxifolin one in all assays applied. As aimed for, no hydrolysis product was found in cellular uptake experiments after 4h whereas different metabolites were detected. Furthermore, the quercetin-cinnamic acid amide showed pronounced activity in an invivo AD mouse model at a remarkably low dose of 0.3mg/kg.
ESTHER : Hofmann_2022_Chemistry__e202200786
PubMedSearch : Hofmann_2022_Chemistry__e202200786
PubMedID: 35621167

Title : Selective Pseudo-irreversible Butyrylcholinesterase Inhibitors Transferring Antioxidant Moieties to the Enzyme Show Pronounced Neuroprotective Efficacy In Vitro and In Vivo in an Alzheimer's Disease Mouse Model - Scheiner_2021_J.Med.Chem_64_9302
Author(s) : Scheiner M , Hoffmann M , He F , Poeta E , Chatonnet A , Monti B , Maurice T , Decker M
Ref : Journal of Medicinal Chemistry , 64(13): :9302 , 2021
Abstract : A series of multitarget-directed ligands (MTDLs) was designed by functionalizing a pseudo-irreversible butyrylcholinesterase (BChE) inhibitor. The obtained hybrids were investigated in vitro regarding their hBChE and hAChE inhibition, their enzyme kinetics, and their antioxidant physicochemical properties (DPPH, ORAC, metal chelating). In addition, in vitro assays were applied to investigate antioxidant effects using murine hippocampal HT22 cells and immunomodulatory effects on the murine microglial N9 cell line. The MTDLs retained their antioxidative properties compared to the parent antioxidant-moieties in vitro and the inhibition of hBChE was maintained in the submicromolar range. Representative compounds were tested in a pharmacological Alzheimer's disease (AD) mouse model and demonstrated very high efficacy at doses as low as 0.1 mg/kg. The most promising compound was also tested in BChE(-/-) mice and showed reduced efficacy. In vivo neuroprotection by BChE inhibition can be effectively enhanced by incorporation of structurally diverse antioxidant moieties.
ESTHER : Scheiner_2021_J.Med.Chem_64_9302
PubMedSearch : Scheiner_2021_J.Med.Chem_64_9302
PubMedID: 34152756

Title : Sterubin: Enantioresolution and Configurational Stability, Enantiomeric Purity in Nature, and Neuroprotective Activity in Vitro and in Vivo - Hofmann_2020_Chemistry_26_7299
Author(s) : Hofmann J , Fayez S , Scheiner M , Hoffmann M , Oerter S , Appelt-Menzel A , Maher P , Maurice T , Bringmann G , Decker M
Ref : Chemistry , 26 :7299 , 2020
Abstract : Alzheimer's disease (AD) is a neurological disorder with still no preventive or curative treatment. Flavonoids are phytochemicals with potential therapeutic value. Previous studies described the flavanone sterubin isolated from the Californian plant Eriodictyon californicum as a potent neuroprotectant in several in vitro assays. Herein, the resolution of synthetic racemic sterubin (1) into its two enantiomers, (R)-1 and (S)-1, is described, which has been performed on a chiral chromatographic phase, and their stereochemical assignment online by HPLC-ECD coupling. (R)-1 and (S)-1 showed comparable neuroprotection in vitro with no significant differences. While the pure stereoisomers were configurationally stable in methanol, fast racemization was observed in the presence of culture medium. We also established the occurrence of extracted sterubin as its pure (S)-enantiomer. Moreover, the activity of sterubin (1) was investigated for the first time in vivo, in an AD mouse model. Sterubin (1) showed a significant positive impact on short- and long-term memory at low dosages.
ESTHER : Hofmann_2020_Chemistry_26_7299
PubMedSearch : Hofmann_2020_Chemistry_26_7299
PubMedID: 32358806

Title : 7-O-Esters of taxifolin with pronounced and overadditive effects in neuroprotection, anti-neuroinflammation, and amelioration of short-term memory impairment in vivo - Gunesch_2020_Redox.Biol_29_101378
Author(s) : Gunesch S , Hoffmann M , Kiermeier C , Fischer W , Pinto AFM , Maurice T , Maher P , Decker M
Ref : Redox Biol , 29 :101378 , 2020
Abstract : Alzheimer's disease (AD) is a multifactorial disease and the most common form of dementia. There are no treatments to cure, prevent or slow down the progression of the disease. Natural products hold considerable interest for the development of preventive neuroprotectants to treat neurodegenerative disorders like AD, due to their low toxicity and general beneficial effects on human health with their anti-inflammatory and antioxidant features. In this work we describe regioselective synthesis of 7-O-ester hybrids of the flavonoid taxifolin with the phenolic acids cinnamic and ferulic acid, namely 7-O-cinnamoyltaxifolin and 7-O-feruloyltaxifolin. The compounds show pronounced overadditive neuroprotective effects against oxytosis, ferroptosis and ATP depletion in the murine hippocampal neuron HT22cell model. Furthermore, 7-O-cinnamoyltaxifolin and 7-O-feruloyltaxifolin reduced LPS-induced neuroinflammation in BV-2 microglia cells as assessed by effects on the levels of NO, IL6 and TNFalpha. In all in vitro assays the 7-O-esters of taxifolin and ferulic or cinnamic acid showed strong overadditive activity, significantly exceeding the effects of the individual components and the equimolar mixtures thereof, which were almost inactive in all of the assays at the tested concentrations. In vivo studies confirmed this overadditive effect. Treatment of an AD mouse model based on the injection of oligomerized Abeta25-35 peptide into the brain to cause neurotoxicity and subsequently memory deficits with 7-O-cinnamoyltaxifolin or 7-O-feruloyltaxifolin resulted in improved performance in an assay for short-term memory as compared to vehicle and mice treated with the respective equimolar mixtures. These results highlight the benefits of natural product hybrids as a novel compound class with potential use for drug discovery in neurodegenerative diseases due to their pharmacological profile that is distinct from the individual natural components.
ESTHER : Gunesch_2020_Redox.Biol_29_101378
PubMedSearch : Gunesch_2020_Redox.Biol_29_101378
PubMedID: 31926632

Title : Dual-Acting Cholinesterase-Human Cannabinoid Receptor 2 Ligands Show Pronounced Neuroprotection in Vitro and Overadditive and Disease-Modifying Neuroprotective Effects in Vivo - Scheiner_2019_J.Med.Chem_62_9078
Author(s) : Scheiner M , Dolles D , Gunesch S , Hoffmann M , Nabissi M , Marinelli O , Naldi M , Bartolini M , Petralla S , Poeta E , Monti B , Falkeis C , Vieth M , Hubner H , Gmeiner P , Maitra R , Maurice T , Decker M
Ref : Journal of Medicinal Chemistry , 62 :9078 , 2019
Abstract : We have designed and synthesized a series of 14 hybrid molecules out of the cholinesterase (ChE) inhibitor tacrine and a benzimidazole-based human cannabinoid receptor subtype 2 (hCB2R) agonist and investigated them in vitro and in vivo. The compounds are potent ChE inhibitors, and for the most promising hybrids, the mechanism of human acetylcholinesterase (hAChE) inhibition as well as their ability to interfere with AChE-induced aggregation of beta-amyloid (Abeta), and Abeta self-aggregation was assessed. All hybrids were evaluated for affinity and selectivity for hCB1R and hCB2R. To ensure that the hybrids retained their agonist character, the expression of cAMP-regulated genes was quantified, and potency and efficacy were determined. Additionally, the effects of the hybrids on microglia activation and neuroprotection on HT-22 cells were investigated. The most promising in vitro hybrids showed pronounced neuroprotection in an Alzheimer's mouse model at low dosage (0.1 mg/kg, i.p.), lacking hepatotoxicity even at high dose (3 mg/kg, i.p.).
ESTHER : Scheiner_2019_J.Med.Chem_62_9078
PubMedSearch : Scheiner_2019_J.Med.Chem_62_9078
PubMedID: 31609608

Title : Novel multitarget-directed ligands targeting acetylcholinesterase and sigma1 receptors as lead compounds for treatment of Alzheimer's disease: Synthesis, evaluation, and structural characterization of their complexes with acetylcholinesterase - Lalut_2019_Eur.J.Med.Chem_162_234
Author(s) : Lalut J , Santoni G , Karila D , Lecoutey C , Davis A , Nachon F , Silman I , Sussman JL , Weik M , Maurice T , Dallemagne P , Rochais C
Ref : Eur Journal of Medicinal Chemistry , 162 :234 , 2019
Abstract : Pleiotropic intervention may be a requirement for effective limitation of the progression of multifactorial diseases such as Alzheimer's Disease. One approach to such intervention is to design a single chemical entity capable of acting on two or more targets of interest, which are accordingly known as Multi-Target Directed Ligands (MTDLs). We recently described donecopride, the first MTDL able to simultaneously inhibit acetylcholinesterase and act as an agonist of the 5-HT4 receptor, which displays promising activities in vivo. Pharmacomodulation of donecopride allowed us to develop a novel series of indole derivatives possessing interesting in vitro activities toward AChE and the sigma1 receptor. The crystal structures of complexes of the most promising compounds with Torpedo californica AChE were solved in order to further understand their mode of inhibition.
ESTHER : Lalut_2019_Eur.J.Med.Chem_162_234
PubMedSearch : Lalut_2019_Eur.J.Med.Chem_162_234
PubMedID: 30447434
Gene_locus related to this paper: torca-ACHE

Title : Highly Selective Butyrylcholinesterase Inhibitors with Tunable Duration of Action by Chemical Modification of Transferable Carbamate Units Exhibit Pronounced Neuroprotective Effect in an Alzheimer's Disease Mouse Model - Hoffmann_2019_J.Med.Chem_62_9116
Author(s) : Hoffmann M , Stiller C , Endres E , Scheiner M , Gunesch S , Sotriffer C , Maurice T , Decker M
Ref : Journal of Medicinal Chemistry , 62 :9116 , 2019
Abstract : In this study, the carbamate structure of pseudo-irreversible butyrylcholinesterase (BChE) inhibitors was optimized with regard to a longer binding to the enzyme. A set of compounds bearing different heterocycles (e.g., morpholine, tetrahydroisoquinoline, benzimidazole, piperidine) and alkylene spacers (2 to 10 methylene groups between carbamate and heterocycle) in the carbamate residue was synthesized and characterized in vitro for their binding affinity, binding kinetics, and carbamate hydrolysis. These novel BChE inhibitors are highly selective for hBChE over human acetycholinesterase (hAChE), yielding short-, medium-, and long-acting nanomolar hBChE inhibitors (with a half-life of the carbamoylated enzyme ranging from 1 to 28 h). The inhibitors show neuroprotective properties in a murine hippocampal cell line and a pharmacological mouse model of Alzheimer's disease (AD), suggesting a significant benefit of BChE inhibition for a disease-modifying treatment of AD.
ESTHER : Hoffmann_2019_J.Med.Chem_62_9116
PubMedSearch : Hoffmann_2019_J.Med.Chem_62_9116
PubMedID: 31609115

Title : Structure-Activity Relationships and Computational Investigations into the Development of Potent and Balanced Dual-Acting Butyrylcholinesterase Inhibitors and Human Cannabinoid Receptor 2 Ligands with Pro-Cognitive in Vivo Profiles - Dolles_2018_J.Med.Chem_61_1646
Author(s) : Dolles D , Hoffmann M , Gunesch S , Marinelli O , Moller J , Santoni G , Chatonnet A , Lohse MJ , Wittmann HJ , Strasser A , Nabissi M , Maurice T , Decker M
Ref : Journal of Medicinal Chemistry , 61 :1646 , 2018
Abstract : The enzyme butyrylcholinesterase (BChE) and the human cannabinoid receptor 2 (hCB2R) represent promising targets for pharmacotherapy in the later stages of Alzheimer's disease. We merged pharmacophores for both targets into small benzimidazole-based molecules, investigated SARs, and identified several dual-acting ligands with a balanced affinity/inhibitory activity and an excellent selectivity over both hCB1R and hAChE. A homology model for the hCB2R was developed based on the hCB1R crystal structure and used for molecular dynamics studies to investigate binding modes. In vitro studies proved hCB2R agonism. Unwanted mu-opioid receptor affinity could be designed out. One well-balanced dual-acting and selective hBChE inhibitor/hCB2R agonist showed superior in vivo activity over the lead CB2 agonist with regards to cognition improvement. The data shows the possibility to combine a small molecule with selective and balanced GPCR-activity/enzyme inhibition and in vivo activity for the therapy of AD and may help to rationalize the development of other dual-acting ligands.
ESTHER : Dolles_2018_J.Med.Chem_61_1646
PubMedSearch : Dolles_2018_J.Med.Chem_61_1646
PubMedID: 29400965

Title : Learning performances and vulnerability to amyloid toxicity in the butyrylcholinesterase knockout mouse - Maurice_2016_Behav.Brain.Res_296_351
Author(s) : Maurice T , Strehaiano M , Simeon N , Bertrand C , Chatonnet A
Ref : Behavioural Brain Research , 296 :351 , 2016
Abstract : Butyrylcholinesterase (BChE) is an important enzyme for detoxication and metabolism of ester compounds. It also hydrolyzes the neurotransmitter acetylcholine (ACh) in pathological conditions and may play a role in Alzheimer's disease (AD). We here compared the learning ability and vulnerability to Abeta toxicity in male and female BChE knockout (KO) mice and their 129Sv wild-type (Wt) controls. Animals tested for place learning in the water-maze showed increased acquisition slopes and presence in the training quadrant during the probe test. An increased passive avoidance response was also observed for males. BChE KO mice therefore showed enhanced learning ability in spatial and non-spatial memory tests. Intracerebroventricular (ICV) injection of increasing doses of amyloid-beta[25-35] (Abeta25-35) peptide oligomers resulted, in Wt mice, in learning and memory deficits, oxidative stress and decrease in ACh hippocampal content. In BChE KO mice, the Abeta25-35-induced deficit in place learning was attenuated in males and blocked in females. No change in lipid peroxidation or ACh levels was observed after Abeta25-35 treatment in male or female BChE KO mice. These data showed that the genetic invalidation of BChE in mice augmented learning capacities and lowered the vulnerability to Abeta toxicity.
ESTHER : Maurice_2016_Behav.Brain.Res_296_351
PubMedSearch : Maurice_2016_Behav.Brain.Res_296_351
PubMedID: 26306824

Title : In Vivo Characterization of ARN14140, a Memantine\/Galantamine-Based Multi-Target Compound for Alzheimer's Disease - Reggiani_2016_Sci.Rep_6_33172
Author(s) : Reggiani AM , Simoni E , Caporaso R , Meunier J , Keller E , Maurice T , Minarini A , Rosini M , Cavalli A
Ref : Sci Rep , 6 :33172 , 2016
Abstract : Alzheimer's disease (AD) is a chronic pathological condition that leads to neurodegeneration, loss of intellectual abilities, including cognition and memory, and ultimately to death. It is widely recognized that AD is a multifactorial disease, where different pathological cascades (mainly amyloid and tau) contribute to neural death and to the clinical outcome related to the disease. The currently available drugs for AD were developed according to the one-target, one-drug paradigm. In recent times, multi-target strategies have begun to play an increasingly central role in the discovery of more efficacious candidates for complex neurological conditions, including AD. In this study, we report on the in vivo pharmacological characterization of ARN14140, a new chemical entity, which was obtained through a multi-target structure-activity relationship campaign, and which showed a balanced inhibiting profile against the acetylcholinesterase enzyme and the NMDA receptor. Based on the initial promising biochemical data, ARN14140 is here studied in mice treated with the amyloidogenic fragment 25-35 of the amyloid-beta peptide, a consolidated non-transgenic AD model. Sub-chronically treating animals with ARN14140 leads to a prevention of the cognitive impairment and of biomarker levels connected to neurodegeneration, demonstrating its neuroprotective potential as new AD agent.
ESTHER : Reggiani_2016_Sci.Rep_6_33172
PubMedSearch : Reggiani_2016_Sci.Rep_6_33172
PubMedID: 27609215

Title : Protection by sigma-1 receptor agonists is synergic with donepezil, but not with memantine, in a mouse model of amyloid-induced memory impairments - Maurice_2015_Behav.Brain.Res_296_270
Author(s) : Maurice T
Ref : Behavioural Brain Research , 296 :270 , 2015
Abstract : Drugs activating the sigma-1 (sigma1) chaperone protein are anti-amnesic and neuroprotective in neurodegenerative pathologies like Alzheimer's disease (AD). Since these so-called sigma1 receptor (sigma1R) agonists modulate cholinergic and glutamatergic systems in a variety of physiological responses, we addressed their putative additive/synergistic action in combination with cholinergic or glutamatergic drugs. The selective sigma1 agonist PRE-084, or the non-selective sigma1 drug ANAVEX2-73 was combined with the acetylcholinesterase inhibitor donepezil or the NMDA receptor antagonist memantine in the nontransgenic mouse model of AD-like memory impairments induced by intracerebroventricular injection of oligomeric Abeta25-35 peptide. Two behavioral tests, spontaneous alternation and passive avoidance response, were used in parallel and both protective and symptomatic effects were examined. After determination of the minimally active doses for each compound, the combinations were tested and the combination index (CI) calculated. Combinations between the sigma1 agonists and donepezil showed a synergic protective effect, with CI<1, whereas the combinations with memantine showed an antagonist effect, with CI>1. Symptomatic effects appeared only additive for all combinations, with CI=1. A pharmacological analysis of the PRE-084+donepezil combination revealed that the synergy could be due to an inter-related mechanism involving alpha7 nicotinic ACh receptors and sigma1R. These results demonstrated that sigma1 drugs do not only offer a protective potential alone but also in combination with other therapeutic agents. The nature of neuromodulatory molecular chaperone of the sigma1R could eventually lead to synergistic combinations.
ESTHER : Maurice_2015_Behav.Brain.Res_296_270
PubMedSearch : Maurice_2015_Behav.Brain.Res_296_270
PubMedID: 26386305

Title : Brain toxicity and inflammation induced in vivo in mice by the amyloid-beta forty-two inducer aftin-4, a roscovitine derivative - Meunier_2015_J.Alzheimers.Dis_44_507
Author(s) : Meunier J , Borjini N , Gillis C , Villard V , Maurice T
Ref : J Alzheimers Dis , 44 :507 , 2015
Abstract : Aftins (amyloid forty-two inducers) represent a novel class of tri-substituted purines derived from roscovitine, able to promote the generation of amyloid-beta (Abeta)1-42 from amyloid-beta protein precursor through gamma-secretase activation in cell cultures. We here examined whether aftin-4 could provoke an amyloid-like toxicity in vivo in mice. The intracerebroventricular administration of aftin-4 (3-20 nmol) increased Abeta1-42, but not Abeta1-40, content in the mouse hippocampus, between 5 and 14 days after injection. Aftin-4 injection increased lipid peroxidation levels in the hippocampus, an index of oxidative stress. It increased brain contents in pro-inflammatory cytokines, IL-1beta, IL-6, and TNFalpha, and GFAP immunolabeling, showing astrocytic reaction. Expression of the synaptic marker synaptophysin was decreased by aftin-4. Finally, the treatment provoked marked learning deficits, observed using different memory procedures: Spontaneous alternation in the Y-maze, place learning in the water-maze, and passive avoidance response. The systemic intraperitoneal injection of aftin-4 in the 3-30 mg/kg dose range also induced oxidative stress and learning deficits. All these alterations could be blocked by pre-treatment with the gamma-secretase inhibitor BMS-299,897, confirming that the mechanism of action of aftin-4 involves secretase activity. Furthermore, we examined if the cholinesterase inhibitor donepezil and the non-steroidal anti-inflammatory drug ibuprofen could prevent aftin-4-induced memory impairments, cytokine release, and lipid peroxidation. Donepezil prevented all alterations, whereas ibuprofen prevented the increases in cytokine release and lipid peroxidation, but only marginally the memory impairments. As a whole, this study showed that in vivo injection of aftin-4 results in a rapid, acute Alzheimer's disease-like toxicity in the rodent brain.
ESTHER : Meunier_2015_J.Alzheimers.Dis_44_507
PubMedSearch : Meunier_2015_J.Alzheimers.Dis_44_507
PubMedID: 25298201

Title : Behavioral phenotyping of heterozygous acetylcholinesterase knockout (AChE+\/-) mice showed no memory enhancement but hyposensitivity to amnesic drugs - Espallergues_2010_Behav.Brain.Res_206_263
Author(s) : Espallergues J , Galvan L , Sabatier F , Rana-Poussine V , Maurice T , Chatonnet A
Ref : Behavioural Brain Research , 206 :263 , 2010
Abstract : Decrease in the expression or activity of acetylcholinesterase (AChE) enzymatic activity results in increased cholinergic tonus in the brain and periphery, with concomitant regulations of nicotinic and muscarinic receptors expression. We generated AChE knockout mice and characterized the behavioral phenotype of heterozygous animals, focusing on learning and memory functions. Male and female, AChE+/- and AChE+/+ littermate controls (129 sv strain) were tested at 5-9 weeks of age. AChE activity was significantly decreased in the hippocampus and cortex of AChE+/- mice, but butyrylcholinesterase activity was preserved. AChE+/- mice failed to show any difference in terms of locomotion, exploration and anxiety parameters in the open-field test. Animals were then tested for place learning in the water-maze. They were trained using a 'sustained acquisition' protocol (3 swim trials per day) or a 'mild acquisition' protocol (2 swim trials per day) to locate an invisible platform in fixed position (reference memory procedure). Then, during 3 days, they were trained to locate the platform in a variable position (working memory procedure). Learning profiles and probe test performances were similar for AChE+/- and AChE+/+ mice. Mice were then treated with the muscarinic receptor antagonist scopolamine (0.5, 5 mg/kg) 20 min before each training session. Scopolamine impaired learning at both doses in AChE+/+ mice, but only at the highest dose in AChE+/- mice. Moreover, the intracerebroventricular injection of amyloid-beta25-35 peptide, 9 nmol, 7 days before water-maze acquisition, failed to induce learning deficits in AChE+/- mice, but impaired learning in AChE+/+ controls. The peptide failed to be toxic in forebrain structures of AChE+/- mice, since an increase in lipid peroxidation levels was measured in the hippocampus of AChE+/+ but not AChE+/- mice. We conclude that the increase in cholinergic tonus observed in AChE+/- mice did not result in increased memory functions but allowed a significant prevention of the deleterious effects of muscarinic blockade or amyloid toxicity.
ESTHER : Espallergues_2010_Behav.Brain.Res_206_263
PubMedSearch : Espallergues_2010_Behav.Brain.Res_206_263
PubMedID: 19766675

Title : Hyposensitivity to the amnesic effects of scopolamine or amyloid beta(25-35) peptide in heterozygous acetylcholinesterase knockout (AChE(+\/-)) mice - Espallergues_2008_Chem.Biol.Interact_175_131
Author(s) : Espallergues J , Galvan L , Lepourry L , Bonafos B , Maurice T , Chatonnet A
Ref : Chemico-Biological Interactions , 175 :131 , 2008
Abstract : We examined the sensitivity of AChE(+/-) mice to the amnesic effects of scopolamine and amyloid beta peptide. AChE(+/-) and AChE(+/+) littermates, tested at 5-9 weeks of age, failed to show any difference in locomotion, exploration and anxiety in the open-field test, or in-place learning in the water-maze. However, when treated with the muscarinic receptor antagonist scopolamine (0.5, 5mg/kg s.c.) 20 min before each water-maze training session, learning impairments were observed at both doses in AChE(+/+) mice, but only at the highest dose in AChE(+/-) mice. The central injection of Abeta(25-35) peptide (9 nmol) induced learning deficits only in AChE(+/+) but not in AChE(+/-) mice. Therefore, the hyper-activity of cholinergic systems in AChE(+/-) mice did not result in increased memory abilities, but prevented the deleterious effects of muscarinic blockade or amyloid toxicity.
ESTHER : Espallergues_2008_Chem.Biol.Interact_175_131
PubMedSearch : Espallergues_2008_Chem.Biol.Interact_175_131
PubMedID: 18533140

Title : Involvement of the sigma1 (sigma1) receptor in the anti-amnesic, but not antidepressant-like, effects of the aminotetrahydrofuran derivative ANAVEX1-41 - Espallergues_2007_Br.J.Pharmacol_152_267
Author(s) : Espallergues J , Lapalud P , Christopoulos A , Avlani VA , Sexton PM , Vamvakides A , Maurice T
Ref : British Journal of Pharmacology , 152 :267 , 2007
Abstract : BACKGROUND AND PURPOSE: Tetrahydro-N, N-dimethyl-5, 5-diphenyl-3-furanmethanamine hydrochloride (ANAVEX1-41) is a potent muscarinic and sigma(1) (sigma (1)) receptor ligand. The sigma (1) receptor modulates glutamatergic and cholinergic responses in the forebrain and selective agonists are potent anti-amnesic and antidepressant DRUGS. WE HAVE HERE ANALYSED THE SIGMA (1) COMPONENT IN THE BEHAVIOURAL EFFECTS OF ANAVEX1-41. EXPERIMENTAL APPROACH: Binding of ANAVEX1-41 to muscarinic and sigma (1) receptors were measured using cell membranes. Behavioural effects of ANAVEX1-41 were tested in mice using memory (spontaneous alternation, passive avoidance, water-maze) and antidepressant-like activity (forced swimming) procedures. KEY
RESULTS: In vitro, ANAVEX1-41 was a potent muscarinic (M(1)>M(3), M(4)>M(2) with K(i) ranging from 18 to 114 nM) and selective sigma (1) ligand (sigma (1), K(i)=44 nM; sigma (2), K(i)=4 microM). In mice, ANAVEX1-41 failed to affect learning when injected alone (0.03-1 mg kg(-1)), but attenuated scopolamine-induced amnesia with a bell-shaped dose response (maximum at 0.1 mg kg(-1)). The sigma (1) antagonist BD1047 blocked the anti-amnesic effect of ANAVEX1-41 on both short- and long-term memories. Pretreatment with a sigma (1) receptor-directed antisense oligodeoxynucleotide prevented effects of ANAVEX1-41 only in the passive avoidance procedure, measuring long-term memory. ANAVEX1-41 reduced behavioural despair at 30 and 60 mg kg(-1), without involving the sigma (1) receptor, as it was not blocked by BD1047 or the antisense oligodeoxynucleotide. CONCLUSIONS AND IMPLICATIONS: ANAVEX1-41 is a potent anti-amnesic drug, acting through muscarinic and sigma (1) receptors. The latter component may be involved in the enhancing effects of the drug on long-term memory processes.
ESTHER : Espallergues_2007_Br.J.Pharmacol_152_267
PubMedSearch : Espallergues_2007_Br.J.Pharmacol_152_267
PubMedID: 17641675

Title : Interaction with sigma(1) protein, but not N-methyl-D-aspartate receptor, is involved in the pharmacological activity of donepezil - Maurice_2006_J.Pharmacol.Exp.Ther_317_606
Author(s) : Maurice T , Meunier J , Feng B , Ieni J , Monaghan DT
Ref : Journal of Pharmacology & Experimental Therapeutics , 317 :606 , 2006
Abstract : In the present study, we examined the interaction of (+/-)-2,3-dihydro-5,6-dimethoxy-2-[[1-(phenylmethyl)-4-piperidinyl]-methyl]-1H-in den-1-one hydrochloride (donepezil), a potent cholinesterase inhibitor, with two additional therapeutically relevant targets, N-methyl-d-aspartate (NMDA) and sigma(1) receptors. Donepezil blocked the responses of recombinant NMDA receptors expressed in Xenopus oocytes. The blockade was voltage-dependent, suggesting a channel blocker mechanism of action, and was not competitive at either the l-glutamate or glycine binding sites. The low potency of donepezil (IC(50) = 0.7-3 mM) suggests that NMDA receptor blockade does not contribute to the therapeutic actions of donepezil. Of potential therapeutic relevance, donepezil binds to the sigma(1) receptor with high affinity (K(i) = 14.6 nM) in an in vitro preparation (Neurosci Lett 260:5-8, 1999). Thus, we sought to determine whether an interaction with the sigma(1) receptor may occur in vivo under physiologically relevant conditions by evaluating the sigma(1) receptor dependence effects of donepezil in behavioral tasks. Donepezil showed antidepressant-like activity in the mouse-forced swimming test as did the sigma(1) receptor agonist igmesine. This effect was not displayed by the other cholinesterase inhibitors, rivastigmine and tacrine. The donepezil and igmesine effects were blocked by preadministration of the sigma(1) receptor antagonist N-[2-(3,4-dichlorophenyl)ethyl]-N-methyl-2-(dimethylamino) ethylamine (BD1047) and an in vivo antisense probe treatment. The memory-enhancing effect of donepezil was also investigated. All cholinesterase inhibitors attenuated dizocilpine-induced learning impairments. However, only the donepezil and igmesine effects were blocked by BD1047 or the antisense treatment. Therefore, donepezil behaved as an effective sigma(1) receptor agonist on these behavioral responses, and an interaction of the drug with the sigma(1) receptor must be considered in its pharmacological actions.
ESTHER : Maurice_2006_J.Pharmacol.Exp.Ther_317_606
PubMedSearch : Maurice_2006_J.Pharmacol.Exp.Ther_317_606
PubMedID: 16397090

Title : Antiamnesic and neuroprotective effects of donepezil against learning impairments induced in mice by exposure to carbon monoxide gas - Meunier_2006_J.Pharmacol.Exp.Ther_317_1307
Author(s) : Meunier J , Ieni J , Maurice T
Ref : Journal of Pharmacology & Experimental Therapeutics , 317 :1307 , 2006
Abstract : Donepezil is a potent acetylcholinesterase inhibitor that also interacts with the sigma1 receptor, an intracellular neuromodulatory protein. In the present study, we analyzed the antiamnesic and neuroprotective activities of donepezil in a mouse hypoxia model induced by repetitive CO exposure, comparing donepezil's pharmacological profile with other cholinesterase inhibitors tacrine, rivastigmine, and galanthamine, and the reference sigma1 agonist igmesine. CO exposure induced, after 7 days, hippocampal neurodegeneration, analyzed by Cresyl violet staining, and behavioral alterations, measured using spontaneous alternation and passive avoidance responses. When injected 20 min before the behavioral tests, i.e., 7 to 8 days after CO, all drugs showed antiamnesic properties. Preadministration of the sigma1 receptor antagonist N-[2-(3,4-dichlorophenyl)ethyl]-N-methyl-2-(dimethylamino)ethylamine (BD1047) blocked only the igmesine and donepezil effects. The neuroprotective activity of the drugs was tested by injection 20 min before the first CO exposure (preinsult protection) or by injection 1 h after the last CO exposure (postinsult protection). All drugs alleviated the hypoxia-induced neurodegeneration and behavioral impairments when injected before CO exposure. Preadministration of BD1047 blocked both the igmesine and donepezil effects. However, when injected after CO exposure, only igmesine and donepezil induced effective neuroprotection, and the morphological and behavioral effects were BD1047-sensitive. These results showed that donepezil is a potent antiamnesic and neuroprotective compound against the neurodegeneration induced by excitotoxic insult, and its pharmacological actions as both an acetylcholinesterase inhibitor and sigma1 receptor agonist contribute to its marked efficacy. In particular, the drug is a more potent postinsult protecting agent compared with more selective cholinesterase inhibitors.
ESTHER : Meunier_2006_J.Pharmacol.Exp.Ther_317_1307
PubMedSearch : Meunier_2006_J.Pharmacol.Exp.Ther_317_1307
PubMedID: 16551835

Title : The anti-amnesic and neuroprotective effects of donepezil against amyloid beta25-35 peptide-induced toxicity in mice involve an interaction with the sigma1 receptor - Meunier_2006_Br.J.Pharmacol_149_998
Author(s) : Meunier J , Ieni J , Maurice T
Ref : British Journal of Pharmacology , 149 :998 , 2006
Abstract : BACKGROUND AND PURPOSE: The acetylcholinesterase inhibitor, donepezil, is also a high affinity sigma(1) receptor agonist. We examined the involvement of sigma(1) receptors in its anti-amnesic and neuroprotective properties against amyloid beta(25-35) peptide-induced toxicity in mice. EXPERIMENTAL APPROACH: Mice were given an intracerebroventricular (i.c.v.) injection of Abeta(25-35) peptide (9 nmol) 7-9 days before being tested for spontaneous alternation and passive avoidance. Hippocampal lipid peroxidation was measured 7 days after Abeta(25-35) injection to evaluate oxidative stress. Donepezil, the sigma(1) agonist PRE-084 or the cholinesterase (ChE) inhibitors tacrine, rivastigmine and galantamine were administered either 20 min before behavioural sessions to check their anti-amnesic effects, or 20 min before Abeta(25-35) injection, or 24 h after Abeta(25-35) injection and then once daily before behavioural sessions, to check their pre- and post-i.c.v. neuroprotective activity, respectively. KEY
RESULTS: All the drugs tested were anti-amnesic, but only the effects of PRE-084 and donepezil were prevented by the sigma(1) antagonist BD1047. Only PRE-084 and donepezil showed neuroprotection when administered pre i.c.v.; they blocked lipid peroxidation and learning deficits, effects inhibited by BD1047. Post i.c.v., PRE-084 and donepezil showed complete neuroprotection whereas the other ChE inhibitors showed partial effects. BD1047 blocked these effects of PRE-084, attenuated those of donepezil, but did not affect the partial effects of the other ChE inhibitors. CONCLUSIONS AND IMPLICATIONS: The potent anti-amnesic and neuroprotective effects of donepezil against Abeta(25-35)-induced toxicity involve both its cholinergic and sigma(1) agonistic properties. This dual action may explain its sustained activity compared to other ChE inhibitors.
ESTHER : Meunier_2006_Br.J.Pharmacol_149_998
PubMedSearch : Meunier_2006_Br.J.Pharmacol_149_998
PubMedID: 17057756

Title : Amnesia induced in mice by centrally administered beta-amyloid peptides involves cholinergic dysfunction - Maurice_1996_Brain.Res_706_181
Author(s) : Maurice T , Lockhart BP , Privat A
Ref : Brain Research , 706 :181 , 1996
Abstract : Substantial evidences suggest that the increased cerebral deposition, and neurotoxic action of the beta-amyloid peptide, the major constituent of senile plaques, may represent the underlying cause of the cognitive deficits observed in Alzheimer's disease. Herein, we attempted to verify this hypothesis by inducing a potential Alzheimer's-type amnesia after direct intracerebroventricular administration of aggregated beta 25-35-amyloid peptide in mice. In this aim, mnesic capacities were evaluated after 6-13 days, using spontaneous alternation in the Y-maze, step-down type passive avoidance and place learning in a water-maze. Pretraining administration of aggregated beta 25-35 peptide induced dose-dependent decreases in both alternation behaviour and passive avoidance, at doses of 3 and 9 nmol/mouse. A reduced but still significant impairment was observed when the peptide was not aggregated, or 'aged', by preincubation for 4 days at 37 degrees C. The beta 1-28 peptide, at 3 nmol/mouse, also induced a marked decrease in step-down latency. Posttraining, but not preretention, administration of beta 25-35 peptide also significantly impaired learning. The beneficial effects of cholinergic agents on beta 25-35-induced amnesia was examined using the cholinesterase inhibitor tacrine (THA, 1.3 and 4.3 mumol/kg i.p.) and the nicotinic receptor agonist (-)-nicotine (NIC, 0.06 and 0.2 mumol/kg i.p.). Both drugs induced a dose-dependent abrogation of the beta 25-35-induced decreases in alternation behaviour and passive avoidance. Furthermore, THA, at 1.3 mumol/kg, and NIC, at 0.2 mumol/kg, also reversed the beta 25-35-induced impairment of place learning and retention in the water-maze. Histological examination of Cresyl violet-stained brain sections indicated a moderate but significant cell loss within the frontoparietal cortex and the hippocampal formation of mice treated with aged beta 25-35 peptide (9 nmol). Examination of Congo red-stained sections in the same animals demonstrated the presence of numerous amyloid deposits throughout these brain areas. These results confirm that the deposition of beta-amyloid peptide in the brain is in some way related to impairment of learning and cholinergic degeneration and suggest that the [25-35] fragment of the beta-amyloid protein, sufficient to induce neuronal death in cultures, also induces an Alzheimer's-type amnesia in mice.
ESTHER : Maurice_1996_Brain.Res_706_181
PubMedSearch : Maurice_1996_Brain.Res_706_181
PubMedID: 8822355