کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1935279 1050662 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reactive oxygen species generated by thiol-modifying phenylarsine oxide stimulate the expression of protein l-isoaspartyl methyltransferase
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Reactive oxygen species generated by thiol-modifying phenylarsine oxide stimulate the expression of protein l-isoaspartyl methyltransferase
چکیده انگلیسی

Expression of the repair enzyme protein l-isoaspartyl methyltransferase (PIMT) has been reported to play important roles in brain. However, little is known about the regulation of PIMT expression following protein damage by oxidation in brain. Phenylarsine oxide (PAO) is an arsenical compound that alters proteins by forming disulfide bond with vicinal cysteinyl residues. Here we report that PIMT was rapidly up-regulated by PAO in U-87 human astroglioma cells. We also confirmed that PIMT up-regulation by PAO was mediated by the reaction with vicinal cysteines. Furthermore, we showed that PIMT induction by PAO was dependent on formation of reactive oxygen species (ROS). Crucially, both ROS formation and PIMT induction by PAO were inhibited by antioxidant N-acetyl-l-cysteine and NADPH oxidase inhibitor diphenyleneiodonium chloride. Importantly, down-regulation of PIMT by siRNA strikingly enhanced PAO-induced ROS. Together, these results highlight that PIMT expression is regulated by ROS and could primarily act as an antioxidant enzyme.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 371, Issue 2, 27 June 2008, Pages 203–208
نویسندگان
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