About: Microsomal ethanol oxidizing system     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WhiteMatter105483677, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)
QRcode icon
http://dbpedia.demo.openlinksw.com/c/7zewqYMAdu

The microsomal ethanol oxidizing system (MEOS) is an alternate pathway of ethanol metabolism that occurs in the smooth endoplasmic reticulum in the oxidation of ethanol to acetaldehyde. While playing only a minor role in ethanol metabolism in average individuals, MEOS activity increases after chronic alcohol consumption. The MEOS pathway requires the CYP2E1 enzyme, part of the cytochrome P450 family of enzymes, to convert ethanol to acetaldehyde. Ethanol’s affinity for CYP2E1 is lower than its affinity for alcohol dehydrogenase. It has delayed activity in non-chronic alcohol consumption states as increase in MEOS activity is correlated with an increase in production of CYP2E1, seen most conclusively in alcohol dehydrogenase negative deer mice.

AttributesValues
rdf:type
rdfs:label
  • Mikrosomales Ethanol-oxidierendes System (de)
  • Sistema microsomiale di ossidazione dell'etanolo (it)
  • Microsomal ethanol oxidizing system (en)
  • MEOS (pl)
  • MEOS (sv)
rdfs:comment
  • Mikrosomalny system utleniania alkoholu (ang. Microsomal Ethanol Oxidizing System) jest alternatywną/dodatkową drogą metabolizowania etanolu, który zachodzi w mikrosomach utleniających etanol do aldehydu octowego. W przypadku często powtarzanego, długotrwałego spożywania alkoholu, szlak z udziałem ADH i ALDH przestaje być wystarczający. Wtedy włączają się mechanizmy adaptacyjne, polegające na rozbudowie gładkiego retikulum endoplazmatycznego w hepatocytach oraz włączeniu szlaku rozkładu etanolu przez enzymy zawarte w mikrosomach. (pl)
  • Als Mikrosomales Ethanol-oxidierendes System (MEOS) bezeichnet man einen von der Alkoholdehydrogenase unabhängigen Weg des Ethanolstoffwechsels in den Leberzellen. Es wurde 1968 zum ersten Mal von Lieber und DeCarli beschrieben. Bei chronischem Alkoholkonsum wird das MEOS induziert und baut neben der ursprünglichen Alkohol-Dehydrogenase Alkohol ab. Damit ist es ein Grundmechanismus der Toleranzentwicklung gegenüber der Substanz. Die Aktivität des MEOS ist mit einer Aktivierung des Cytochrom P450 2E1 verbunden. Durch das MEOS und die von ihm induzierten Cytochrome kann auch die Verstoffwechslung anderer Substanzen vermindert oder zu toxischen Metaboliten verschoben werden. Dies erklärt zum Beispiel nachteilige Arzneimittelreaktionen von chronisch Alkoholabhängigen. Außerdem interferiert das (de)
  • The microsomal ethanol oxidizing system (MEOS) is an alternate pathway of ethanol metabolism that occurs in the smooth endoplasmic reticulum in the oxidation of ethanol to acetaldehyde. While playing only a minor role in ethanol metabolism in average individuals, MEOS activity increases after chronic alcohol consumption. The MEOS pathway requires the CYP2E1 enzyme, part of the cytochrome P450 family of enzymes, to convert ethanol to acetaldehyde. Ethanol’s affinity for CYP2E1 is lower than its affinity for alcohol dehydrogenase. It has delayed activity in non-chronic alcohol consumption states as increase in MEOS activity is correlated with an increase in production of CYP2E1, seen most conclusively in alcohol dehydrogenase negative deer mice. (en)
  • Il sistema microsomiale di ossidazione dell'etanolo (microsomal ethanol oxidizing system o MEOS, ora chiamato sistema CYP450) è una via alternativa per la metabolizzazione dell'etanolo che si manifesta nel reticolo endoplasmatico liscio, durante l'ossidazione in acetaldeide. Sebbene svolga un ruolo minore nell'individuo medio, un consumo continuativo di alcol permette un aumento della sua attività. (it)
  • MEOS står för "microsomal ethanol oxidizing system" och är ett enzymsystem för nedbrytning av etanol som sker i organeller kallade , varifrån systemet fått sitt namn. Mikrosomer är en form av vesiklar som bildats från endoplasmatiska retiklet. Dessa innehåller bland annat cytokrom P450 (CYP) som är en klass av metabola enzymer. Det specifika enzymet som katalyserar etanolnedbrytningen till acetaldehyd i mikrosomerna kallas CYP2E1. Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Microsomal ethanol oxidizing system, 8 november 2011. (sv)
dct:subject
Wikipage page ID
Wikipage revision ID
Link from a Wikipage to another Wikipage
sameAs
dbp:wikiPageUsesTemplate
has abstract
  • Als Mikrosomales Ethanol-oxidierendes System (MEOS) bezeichnet man einen von der Alkoholdehydrogenase unabhängigen Weg des Ethanolstoffwechsels in den Leberzellen. Es wurde 1968 zum ersten Mal von Lieber und DeCarli beschrieben. Bei chronischem Alkoholkonsum wird das MEOS induziert und baut neben der ursprünglichen Alkohol-Dehydrogenase Alkohol ab. Damit ist es ein Grundmechanismus der Toleranzentwicklung gegenüber der Substanz. Die Aktivität des MEOS ist mit einer Aktivierung des Cytochrom P450 2E1 verbunden. Durch das MEOS und die von ihm induzierten Cytochrome kann auch die Verstoffwechslung anderer Substanzen vermindert oder zu toxischen Metaboliten verschoben werden. Dies erklärt zum Beispiel nachteilige Arzneimittelreaktionen von chronisch Alkoholabhängigen. Außerdem interferiert das MEOS mit dem Fettstoffwechsel der Leberzellen und wird auch als eine Ursache der Entstehung der Fettleber gesehen. (de)
  • The microsomal ethanol oxidizing system (MEOS) is an alternate pathway of ethanol metabolism that occurs in the smooth endoplasmic reticulum in the oxidation of ethanol to acetaldehyde. While playing only a minor role in ethanol metabolism in average individuals, MEOS activity increases after chronic alcohol consumption. The MEOS pathway requires the CYP2E1 enzyme, part of the cytochrome P450 family of enzymes, to convert ethanol to acetaldehyde. Ethanol’s affinity for CYP2E1 is lower than its affinity for alcohol dehydrogenase. It has delayed activity in non-chronic alcohol consumption states as increase in MEOS activity is correlated with an increase in production of CYP2E1, seen most conclusively in alcohol dehydrogenase negative deer mice. The MEOS pathway converts ethanol to acetaldehyde by way of a redox reaction. In this reaction, ethanol is oxidized (losing two hydrogens) and O2 is reduced (by accepting hydrogen) to form H2O. NADPH is used as donor of hydrogen, forming NADP+. This process consumes ATP and dissipates heat, thus leading to the hypothesis that long term drinkers see an increase in resting energy expenditure. The increase in rest energy expenditure has, according to some studies, been explained by indicating that the MEOS "expends" nine calories per gram of ethanol to metabolize versus 7 calories per gram of ethanol ingested. This results in a net loss of 2 calories per gram of ethanol ingested. (en)
  • Il sistema microsomiale di ossidazione dell'etanolo (microsomal ethanol oxidizing system o MEOS, ora chiamato sistema CYP450) è una via alternativa per la metabolizzazione dell'etanolo che si manifesta nel reticolo endoplasmatico liscio, durante l'ossidazione in acetaldeide. Sebbene svolga un ruolo minore nell'individuo medio, un consumo continuativo di alcol permette un aumento della sua attività. Il sistema MEOS richiede l'attività dell'enzima CYP2E1, il quale adopera come coenzima il citocromo P450. L'affinità che l'etanolo possiede nei confronti di questo enzima è inferiore rispetto a quello verso l'alcol deidrogenasi (ADH), per cui in individui non avvezzi al consumo di alcol la sua attivazione è inevitabilmente ritardata. La via MEOS converte l'etanolo ad acetaldeide mediante una reazione redox, in cui i due elettroni persi dall'etanolo vengono usati per la riduzione della molecola di ossigeno (O2) a dare acqua (H2O). Il donatore degli atomi di idrogeno è NADPH, producendo così NADP+. Questa reazione è esotermica e consuma ATP, per cui si ipotizza che etilisti cronici possiedono un maggior dispendio energetico. L'aumento del dispendio energetico sembra essere spiegato, secondo recenti studi, dal fatto che per metabolizzare 7 cal/g di etanolo il sistema MEOS dissipa 9 calorie. Il che significa che vi è una perdita di 2 calorie per grammo di etanolo ingerito. (it)
  • Mikrosomalny system utleniania alkoholu (ang. Microsomal Ethanol Oxidizing System) jest alternatywną/dodatkową drogą metabolizowania etanolu, który zachodzi w mikrosomach utleniających etanol do aldehydu octowego. W przypadku często powtarzanego, długotrwałego spożywania alkoholu, szlak z udziałem ADH i ALDH przestaje być wystarczający. Wtedy włączają się mechanizmy adaptacyjne, polegające na rozbudowie gładkiego retikulum endoplazmatycznego w hepatocytach oraz włączeniu szlaku rozkładu etanolu przez enzymy zawarte w mikrosomach. (pl)
  • MEOS står för "microsomal ethanol oxidizing system" och är ett enzymsystem för nedbrytning av etanol som sker i organeller kallade , varifrån systemet fått sitt namn. Mikrosomer är en form av vesiklar som bildats från endoplasmatiska retiklet. Dessa innehåller bland annat cytokrom P450 (CYP) som är en klass av metabola enzymer. Det specifika enzymet som katalyserar etanolnedbrytningen till acetaldehyd i mikrosomerna kallas CYP2E1. MEOS står normalt sett bara för en liten del av etanolmetabolismen, men induceras vid kroniskt alkoholintag till att stå för en allt större del av nedbrytningen av etanol. Induktionen innebär ökad syntes av CYP-enzym, särskilt CYP2E1. Systemet förbrukar NADPH till NADP+ under sin verkningsmekanism. Bildandet av NADPH är en ATP-krävande process, energin som frigörs avges i slutändan som värme, detta kan vara en av anledningarna till den förhöjda basalmetabolismen som ses hos kroniska alkoholanvändare. Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Microsomal ethanol oxidizing system, 8 november 2011. (sv)
gold:hypernym
prov:wasDerivedFrom
page length (characters) of wiki page
foaf:isPrimaryTopicOf
is Link from a Wikipage to another Wikipage of
is Wikipage redirect of
is Wikipage disambiguates of
is foaf:primaryTopic of
Faceted Search & Find service v1.17_git147 as of Sep 06 2024


Alternative Linked Data Documents: ODE     Content Formats:   [cxml] [csv]     RDF   [text] [turtle] [ld+json] [rdf+json] [rdf+xml]     ODATA   [atom+xml] [odata+json]     Microdata   [microdata+json] [html]    About   
This material is Open Knowledge   W3C Semantic Web Technology [RDF Data] Valid XHTML + RDFa
OpenLink Virtuoso version 08.03.3332 as of Dec 5 2024, on Linux (x86_64-generic-linux-glibc212), Single-Server Edition (378 GB total memory, 57 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2025 OpenLink Software