کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10847663 | 1070363 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of cholesterol oxides on cell death induction and calcium increase in human neuronal cells (SK-N-BE) and evaluation of the protective effects of docosahexaenoic acid (DHA; C22:6 n-3)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Some oxysterols are associated with neurodegenerative diseases. Their lipotoxicity is characterized by an oxidative stress and induction of apoptosis. To evaluate the capacity of these molecules to trigger cellular modifications involved in neurodegeneration, human neuronal cells SK-N-BE were treated with 7-ketocholesterol, 7α- and 7β-hydroxycholesterol, 6α- and 6β-hydroxycholesterol, 4α- and 4β-hydroxycholesterol, 24(S)-hydroxycholesterol and 27-hydroxycholesterol (50-100 μM, 24 h) without or with docosahexaenoic acid (50 μM). The effects of these compounds on mitochondrial activity, cell growth, production of reactive oxygen species (ROS) and superoxide anions (O2â), catalase and superoxide dismutase activities were determined. The ability of the oxysterols to induce increases in Ca2+ was measured after 10 min and 24 h of treatment using fura-2 videomicroscopy and Von Kossa staining, respectively. Cholesterol, 7-ketocholesterol, 7β-hydroxycholesterol, and 24(S)-hydroxycholesterol (100 μM) induced mitochondrial dysfunction, cell growth inhibition, ROS overproduction and cell death. A slight increase in the percentage of cells with condensed and/or fragmented nuclei, characteristic of apoptotic cells, was detected. With 27-hydroxycholesterol, a marked increase of O2â was observed. Increases in intracellular Ca2+ were only found with 7-ketocholesterol, 7β-hydroxycholesterol, 24(S)-hydroxycholesterol and 27-hydroxycholesterol. Pre-treatment with docosahexaenoic acid showed some protective effects depending on the oxysterol considered. According to the present data, 7-ketocholesterol, 7β-hydroxycholesterol, 24(S)-hydroxycholesterol and 27-hydroxycholesterol could favor neurodegeneration by their abilities to induce mitochondrial dysfunctions, oxidative stress and/or cell death associated or not with increases in cytosolic calcium levels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Steroids - Volume 99, Part B, July 2015, Pages 238-247
Journal: Steroids - Volume 99, Part B, July 2015, Pages 238-247
نویسندگان
Amira Zarrouk, Thomas Nury, Mohammad Samadi, Yvonne O'Callaghan, Mohamed Hammami, Nora M. O'Brien, Gérard Lizard, John J. Mackrill,