کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2497682 1556714 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure prerequisite for antioxidant activity of silybin in different biochemical systems in vitro
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی بالینی
پیش نمایش صفحه اول مقاله
Structure prerequisite for antioxidant activity of silybin in different biochemical systems in vitro
چکیده انگلیسی

Structural analogues (flavanone: 2–4 and flavone: 5 and 6, respectively) of silybin (1a) were synthesized and tested for inhibitory activity on O2− release and PKC translocation in PMA-stimulated neutrophils as well as xanthine oxidase activity in order to identify the molecular structures responsible for the antioxidant property of silybin. Concerning the prevention of hem-mediated oxidative modification of LDL by silybin, the hydroxyl radical scavenging activity of its structural analogues was also determined. We demonstrated that the basic skeleton of 1a (4) is responsible for its inhibitory activity on O2− release in PMA-stimulated neutrophils via inhibition of PKC translocation, since introduction of a double bound and hydroxyl groups at C-5 and C-7 position (5 and 6) did not result in further increase in inhibition of O2− release. It has been shown that the presence of the phenolic hydroxyl group at C-5 and C-7 of 1a is essential for the inhibition of xanthine oxidase activity. Moreover, introduction of a double bond into the C-ring of 2 and 3, resulting in flavone derivatives (5 and 6), markedly enhanced the antioxidant effect in all the tested systems. Finally, silybin (1a) and its flavon derivatives (5 and 6) directly scavenged hydroxyl radicals as well. On the basis of these results it might be concluded that different moiety of silybin is responsible for inhibition of overproduction of O2− in stimulated neutrophils, xanthine oxidase activity, and for prevention of hem-mediated oxidative modification of LDL.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Phytomedicine - Volume 13, Issues 1–2, 5 January 2006, Pages 85–93
نویسندگان
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