Effects of Tryptophan and 5-Hydroxytryptophan on the Hepatic Cell Membrane Rigidity Due to Oxidative Stress

Effects of Tryptophan and 5-Hydroxytryptophan on the Hepatic Cell Membrane Rigidity Due to... The ability of several indoleamines to scavenge free radicals is well documented. Our aim was to evaluate the ability of 0.01–3 mm tryptophan (Trp) and 0.1–5 mm 5-hydroxytryptophan (5-OH-Trp) to protect hepatic cell membranes against 0.1 mm FeCl3 plus 0.1 mm ascorbic acid–induced lipid peroxidation and increases in membrane rigidity. Membrane fluidity was evaluated using fluorescence spectroscopy. Lipid and protein oxidation were estimated by quantifying malondialdehyde (MDA) plus 4-hydroxyalkenals (4-HDA) concentrations and carbonyl group content, respectively. Exposure to FeCl3 plus ascorbic acid increased hepatic cell membrane rigidity, MDA + 4-HDA and carbonyl content. The presence of 5-OH-Trp, but not Trp, attenuated these changes. In the absence of oxidative stress, neither indoleamine modified fluidity, MDA + 4-HDA or carbonylation. These results suggest that C5 hydroxylation determines the ability of Trp to preserve membrane fluidity in the presence of oxidative stress. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Effects of Tryptophan and 5-Hydroxytryptophan on the Hepatic Cell Membrane Rigidity Due to Oxidative Stress

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Publisher
Springer-Verlag
Copyright
Copyright © 2009 by Springer Science+Business Media, LLC
Subject
Life Sciences; Human Physiology ; Biochemistry, general
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s00232-009-9208-y
Publisher site
See Article on Publisher Site

Abstract

The ability of several indoleamines to scavenge free radicals is well documented. Our aim was to evaluate the ability of 0.01–3 mm tryptophan (Trp) and 0.1–5 mm 5-hydroxytryptophan (5-OH-Trp) to protect hepatic cell membranes against 0.1 mm FeCl3 plus 0.1 mm ascorbic acid–induced lipid peroxidation and increases in membrane rigidity. Membrane fluidity was evaluated using fluorescence spectroscopy. Lipid and protein oxidation were estimated by quantifying malondialdehyde (MDA) plus 4-hydroxyalkenals (4-HDA) concentrations and carbonyl group content, respectively. Exposure to FeCl3 plus ascorbic acid increased hepatic cell membrane rigidity, MDA + 4-HDA and carbonyl content. The presence of 5-OH-Trp, but not Trp, attenuated these changes. In the absence of oxidative stress, neither indoleamine modified fluidity, MDA + 4-HDA or carbonylation. These results suggest that C5 hydroxylation determines the ability of Trp to preserve membrane fluidity in the presence of oxidative stress.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Oct 22, 2009

References

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