کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8268874 | 1534954 | 2015 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
NADPH oxidase 4 regulates homocysteine metabolism and protects against acetaminophen-induced liver damage in mice
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کلمات کلیدی
APAPBIAMgenome-wide association analysisCGLNOX4BHMTHcyCBSGCLDmgRNSALTGSSGNACGSHcystathionine γ-lyase - cystationine γ-lyaseNADPH oxidase 4 - NADPH اکسیداز 4ROS - ROSAST - آسپارتات ترانس آمینازAcetaminophen (paracetamol) - استامینوفن (پاراستامول)betaine-homocysteine methyltransferase - بتائین-هموسیستئین متیل ترانسفرازdimethylglycine - دی متیل گلیسینHepatotoxicity - سمیت کبدγ-glutamylcysteine ligase - لیگاز γ-گلوتامیل سیستئینMethionine synthase - متیونین سنتازGWAS - مطالعهٔ همخوانی سراسر ژنومwild-type. - نوع وحشی.N-acetyl cysteine - نیتستیل سیستئینhomocysteine - هوموسیستئینSingle nucleotide polymorphism - پلیمورفیسم تک نوکلئوتیدیSNP - چندریختی تک-نوکلئوتیدGlutathione - گلوتاتیونoxidised glutathione - گلوتاتیون اکسید شدهglutathione synthetase - گلوتاتیون سنتتازreactive nitrogen species - گونه های واکنش پذیر نیتروژنReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Glutathione is the major intracellular redox buffer in the liver and is critical for hepatic detoxification of xenobiotics and other environmental toxins. Hepatic glutathione is also a major systemic store for other organs and thus impacts on pathologies such as Alzheimer's disease, Sickle Cell Anaemia and chronic diseases associated with aging. Glutathione levels are determined in part by the availability of cysteine, generated from homocysteine through the transsulfuration pathway. The partitioning of homocysteine between remethylation and transsulfuration pathways is known to be subject to redox-dependent regulation, but the underlying mechanisms are not known. An association between plasma Hcy and a single nucleotide polymorphism within the NADPH oxidase 4 locus led us to investigate the involvement of this reactive oxygen species- generating enzyme in homocysteine metabolism. Here we demonstrate that NADPH oxidase 4 ablation in mice results in increased flux of homocysteine through the betaine-dependent remethylation pathway to methionine, catalysed by betaine-homocysteine-methyltransferase within the liver. As a consequence NADPH oxidase 4-null mice display significantly lowered plasma homocysteine and the flux of homocysteine through the transsulfuration pathway is reduced, resulting in lower hepatic cysteine and glutathione levels. Mice deficient in NADPH oxidase 4 had markedly increased susceptibility to acetaminophen-induced hepatic injury which could be corrected by administration of N-acetyl cysteine. We thus conclude that under physiological conditions, NADPH oxidase 4-derived reactive oxygen species is a regulator of the partitioning of the metabolic flux of homocysteine, which impacts upon hepatic cysteine and glutathione levels and thereby upon defence against environmental toxins.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Free Radical Biology and Medicine - Volume 89, December 2015, Pages 918-930
Journal: Free Radical Biology and Medicine - Volume 89, December 2015, Pages 918-930
نویسندگان
Thomas V.A. Murray, Xuebin Dong, Greta J. Sawyer, Anna Caldwell, John Halket, Roy Sherwood, Alberto Quaglia, Tracy Dew, Narayana Anilkumar, Simon Burr, Rajesh K. Mistry, Daniel Martin, Katrin Schröder, Ralf P. Brandes, Robin D. Hughes, Ajay M. Shah,