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| Content Provider | Springer Nature Link |
|---|---|
| Author | Tsakiris, Stylias Carageorgiou, Haris Schulpis, Kleopatra H. |
| Copyright Year | 2005 |
| Abstract | The aim of this study was to evaluate whether the addition of the antioxidants L-cysteine (Cys) or the reduced glutathione (GSH) could reverse the alterations of brain total antioxidant status (TAS) and the modulated activities of the enzymes (Na$^{+}$,K$^{+}$)-ATPase, and Mg$^{2+}$-ATPase in adult or aged rat brain homogenates induced by galactosemia in vitro. Mixture A [mix. A: galactose-1-phosphate (Gal-1-P, 2 mM) plus galactitol (Galtol, 2 mM) plus galactose (Gal, 4 mM) = classical galactosemia] or mixture B [mix. B: Galtol (2 mM) plus Gal (1 mM) = galactokinase deficiency galactosemia] were preincubated in the presence or absence of Cys (0.83 mM) or GSH (0.83 mM) with adult or aged brain homogenates at 37$^{∘}$C for 1 h. TAS and the enzyme activities were determined spectrophotometrically. Mix. A or mix. B preincubation with the adult brain resulted in a significant (Na$^{+}$,K$^{+}$)-ATPase inhibition (−30%) and a Mg$^{2+}$-ATPase stimulation (+300% and +33%, respectively), whereas lower modifications of the enzyme activities (p < 0.001) were found in the aged brain. Gal mixtures decreased TAS by 40% (p < 0.001) and by 20% (p < 0.01) in adult and aged samples, respectively. The antioxidants significantly increased TAS resulting in the reversion of (Na$^{+}$,K$^{+}$)-ATPase inhibition and Mg$^{2+}$-ATPase stimulation by mix. B only. The inhibitory effect of Gal and its derivatives on brain (Na$^{+}$,K$^{+}$)-ATPase and their stimulatory effect on Mg$^{2+}$-ATPase are being decreased with age, probably due to the producion of free radicals. Cys and GSH increased TAS resulting in a reversion of the inhibited (Na$^{+}$,K$^{+}$)-ATPase in both models of the in vitro galactosemia and the stimulated Mg$^{2+}$-ATPase in galactokinase deficiency galactosemia only. |
| Starting Page | 87 |
| Ending Page | 95 |
| Page Count | 9 |
| File Format | |
| ISSN | 08857490 |
| Journal | Metabolic Brain Disease |
| Volume Number | 20 |
| Issue Number | 1 |
| e-ISSN | 15737365 |
| Language | English |
| Publisher | Kluwer Academic Publishers-Plenum Publishers |
| Publisher Date | 2005-01-01 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Adult rat brain aged rat brain (Na$^{+}$,K$^{+}$)-ATPase Mg$^{2+}$-ATPase galactosemia antioxidants Neurosciences Neurology Oncology Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biochemistry Neurology (clinical) Cellular and Molecular Neuroscience |
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