کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9410918 | 1613318 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Up-regulation of gamma-glutamyl transpeptidase (GGT) activity in growth perturbed C6 astrocytes
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کلمات کلیدی
Membrane composition and cell-surface macromolecules - ترکیب غشاء و ماکرومولکول های سطح سلولیOxidative stress - تنش اکسیداتیوCell proliferation and differentiation - تکثیر و تمایز سلولیCellular and molecular biology - زیست شناسی سلولی و مولکولیgamma-glutamyl transpeptidase - گاما گلوتامیل ترانسپپتیداز
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب سلولی و مولکولی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Activity of gamma-glutamyl transpeptidase (GGT) was studied in astrocyte-like C6 glial cells modulated in growth and maturation by different concentration of serum and dibutyryl cyclic AMP (Db-cAMP) supplement in culture medium. After reduction of serum concentration from 10% to 0.1%, the number of GGT positive cells determined histochemically increased 3.1 times and the GGT activity/mg protein in whole cell lysates was 5.1 times higher. In cultures with 0.1% serum + Db-cAMP, the histochemically and biochemically assayed GGT activity exceeded 5.1 and 7.9 times the values measured in control 10% serum cultures, respectively. The up-regulation of GGT was accompanied by an inhibition of proliferation, enhanced differentiation and hypertrophy of cells. In addition, the process of metabolic perturbation and/or cellular stress was revealed in these cultures by the (i) growth-support release followed by shrinkage and death of a small number of cells and (ii) higher oxidation of 2â²7â²dichlorofluorescein diacetate to its fluorescent form in the adherent/viable cells. The observed up-regulation of GGT is considered to primarily reflect increased metabolism of glutathione and/or the maintenance of the redox potential in cells stressed by sub-optimal concentration of serum and Db-cAMP supplement. The concomitant cellular hypertrophy and differentiation and their relationship to increased activity of GGT await further investigation. The study suggests that up-regulation of GGT can contribute to adaptation of astrocytic cells to metabolic and/or oxidative perturbances occurring under various pathological conditions, including radiation- and drug-induced toxicity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular Brain Research - Volume 136, Issues 1â2, 20 May 2005, Pages 75-80
Journal: Molecular Brain Research - Volume 136, Issues 1â2, 20 May 2005, Pages 75-80
نویسندگان
V. MareÅ¡, R. MalÃk, V. Lisá, A. Å edo,