/Biotransformation is/ hepatic, probably by the cytochrome P-450 system; primarily by hydroxylation and conjugation to metabolites that are neither pharmacologically active nor neurotoxic.
About 40-50% of absorbed dose appears in unchanged in urine, an additional 40% is present as unidentified metabolites and conjugates. About 15% is present parahydroxyfelbamate, 2-hydroxyfelbamate, and felbamate monocarbamate, none of which have significant anticonvulsant activity.
Felbamate (FBM; 2-phenyl-1,3-propanediol dicarbamate) is an approved antiepileptic drug shown to be effective in a variety of seizure disorders refractory to other treatments. However, its use has been restricted because of association with occurrence of rare cases of aplastic anemia and hepatic failure. Since it was shown that FBM metabolism requires glutathione (GSH), we used two experimental protocols to determine if the effects of specific metabolites were sensitive to redox pathways. FBM and its metabolite W873 (2-phenyl-1,3-propanediol monocarbamate), at 0.1 mg/mL, induced increased apoptosis of bone marrow cells from B10.AKM mice as compared with B10.BR mice. Study of the effects of the drug on human promonocytic cell line U937 cells showed that FBM and the metabolite W2986 [2-(4-hydroxyphenyl)-1,3 propanediol dicarbamate], at higher concentrations (0.5 mg/mL), induced apoptosis in this cell line. We also observed that while FBM and its metabolites induced increased apoptosis of B cells with reduced intracellular GSH levels, addition of exogenous GSH decreased apoptosis induced by W873 but did not significantly affect apoptosis induced by FBM or W2986. /The authors/ results suggest that, at concentrations used during the present investigations, FBM metabolites induce apoptosis via redox-sensitive and redox-independent pathways.
Antiepileptic therapy with a broad spectrum drug felbamate (FBM) has been limited due to reports of hepatotoxicity and aplastic anemia associated with its use. It was proposed that a bioactivation of FBM leading to formation of alpha,beta-unsaturated aldehyde, atropaldehyde (ATPAL) could be responsible for toxicities associated with the parent drug. Other members of this class of compounds, acrolein and 4-hydroxynonenal (HNE), are known for their reactivity and toxicity. It has been proposed that the bioactivation of FBM to ATPAL proceeds though a more stable cyclized product, 4-hydroxy-5-phenyltetrahydro-1,3-oxazin-2-one (CCMF) whose formation has been shown recently. Aldehyde dehydrogenase (ALDH) and glutathione transferase (GST) are detoxifying enzymes and targets for reactive aldehydes. This study examined effects of ATPAL and its precursor, CCMF on ALDH, GST and cell viability in liver, the target tissue for its metabolism and toxicity. A known toxin, HNE, which is also a substrate for ALDH and GST, was used for comparison. Interspecies difference in metabolism of FBM is well documented, therefore, human tissue was deemed most relevant and used for these studies. ATPAL inhibited ALDH and GST activities and led to a loss of hepatocyte viability. Several fold greater concentrations of CCMF were necessary to demonstrate a similar degree of ALDH inhibition or cytotoxicity as observed with ATPAL. This is consistent with CCMF requiring prior conversion to the more proximate toxin, ATPAL. GSH was shown to protect against ALDH inhibition by ATPAL. In this context, ALDH and GST are detoxifying pathways and their inhibition would lead to an accumulation of reactive species from FBM metabolism and/or metabolism of other endogenous or exogenous compounds and predisposing to or causing toxicity. Therefore, mechanisms of reactive aldehydes toxicity could include direct interaction with critical cellular macromolecules or indirect interference with cellular detoxification mechanisms.
The mechanism by which felbamate exerts its anticonvulsant activity is unknown, but in animal test systems designed to detect anticonvulsant activity, felbamate has properties in common with other marketed anticonvulsants. <i>In vitro</i> receptor binding studies suggest that felbamate may be an antagonist at the strychnine-insensitive glycine-recognition site of the N-methyl-D-aspartate (NMDA) receptor-ionophore complex. Antagonism of the NMDA receptor glycine binding site may block the effects of the excitatory amino acids and suppress seizure activity. Animal studies indicate that felbamate may increase the seizure threshold and may decrease seizure spread. It is also indicated that felbamate has weak inhibitory effects on GABA-receptor binding, benzodiazepine receptor binding.
Prospective studies suggest that chronic felbamate therapy is not accompanied by significant elevations in serum aminotransferase levels. Nevertheless, clinically apparent hepatotoxicity from felbamate is well described, although uncommon, estimated to occur in 1 in 18,500 to 25,000 exposures, often with severe outcome. The onset of injury is 1 to 6 months after starting therapy and the pattern of enzyme elevations is typically hepatocellular. More than a dozen instances of acute liver failure and death were attributed to felbamate before severe restrictions were placed upon its use. Felbamate has not been associated with anticonvulsant hypersensitivity syndrome and is a potential alternative for persons who have developed that syndrome from other anticonvulsants.
Felbamate enters the central nervous system (CNS), with a brain/plasma coefficient of approximately 0.9. The apparent volume of distribution (Vol D) ranged from 0.73 to 0.85 L per kg of body weight (L/kg) in single and multiple dose studies.
[EN] COMPOUNDS AND THEIR USE AS BACE INHIBITORS<br/>[FR] COMPOSÉS ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE BACE
申请人:ASTRAZENECA AB
公开号:WO2016055858A1
公开(公告)日:2016-04-14
The present application relates to compounds of formula (I), (la), or (lb) and their pharmaceutical compositions/preparations. This application further relates to methods of treating or preventing Αβ-related pathologies such as Down's syndrome, β- amyloid angiopathy such as but not limited to cerebral amyloid angiopathy or hereditary cerebral hemorrhage, disorders associated with cognitive impairment such as but not limited to MCI ("mild cognitive impairment"), Alzheimer's disease, memory loss, attention deficit symptoms associated with Alzheimer's disease, neurodegeneration associated with diseases such as Alzheimer's disease or dementia, including dementia of mixed vascular and degenerative origin, pre-senile dementia, senile dementia and dementia associated with Parkinson's disease.
4' SUBSTITUTED COMPOUNDS HAVING 5-HT6 RECEPTOR AFFINITY
申请人:Dunn Robert
公开号:US20080318941A1
公开(公告)日:2008-12-25
The present disclosure provides compounds having affinity for the 5-HT
6
receptor which are of the formula (I):
wherein R
1
, R
2
, R
5
, R
6
, B, D, E, G, Q, x and n are as defined herein. The disclosure also relates to methods of preparing such compounds, compositions containing such compounds, and methods of use thereof.
Heterobicyclic compounds of Formula (I):
or a pharmaceutically-acceptable salt, tautomer, or stereoisomer thereof, as defined in the specification, and compositions containing them, and processes for preparing such compounds. Provided herein also are methods of treating disorders or diseases treatable by inhibition of PDE10, such as obesity, non-insulin dependent diabetes, schizophrenia, bipolar disorder, obsessive-compulsive disorder, Huntington's Disease, and the like.
Formula (I)的杂环化合物:
或其药用可接受的盐、互变异构体或立体异构体,如规范中所定义,并含有它们的组合物,以及制备这种化合物的方法。本文还提供了通过抑制PDE10来治疗由此可治疗的疾病或疾病的方法,如肥胖症、非胰岛素依赖型糖尿病、精神分裂症、躁郁症、强迫症、亨廷顿病等。
[EN] PROCESSES USEFUL FOR THE SYNTHESIS OF (R)-1-{2-[4'-(3-METHOXYPROPANE-1-SULFONYL)-BIPHENYL-4-YL]-ETHYL}-2-METHYL-PYRROLIDINE<br/>[FR] PROCÉDÉS UTILES POUR LA SYNTHÈSE DE LA (R)-1-{2-[4'-(3-MÉTHOXYPROPANE-1-SULFONYL)-BIPHÉNYL-4-YL]-ÉTHYL}-2-MÉTHYL-PYRROLIDINE
申请人:ARENA PHARM INC
公开号:WO2009128907A1
公开(公告)日:2009-10-22
Processes useful for making a pharmaceutically useful compound according to Formula (I), forms of such a compound, and intermediates useful in such processes are described.
根据公式(I)制备药用化合物的有用过程,以及该化合物的形式和在这些过程中有用的中间体被描述。
[EN] SUBSTITUTED PIPERIDINE COMPOUND AND USE THEREOF<br/>[FR] COMPOSÉ DE PIPÉRIDINE SUBSTITUÉE ET SON UTILISATION
申请人:TAKEDA PHARMACEUTICALS CO
公开号:WO2017135306A1
公开(公告)日:2017-08-10
Provided is a substituted piperidine compound having an orexin type 2 receptor agonist activity. A compound represented by the formula (I): wherein each symbol is as described in the DESCRIPTION, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as a prophylactic or therapeutic agent for narcolepsy.