The protection of hepatocyte cells from the effects of oxidative stress by treatment with vitamin E in conjunction with DTT.
We investigated the effect of vitamin E on membrane protein thiols under oxidative stress, which we induced by treating hepatocytes with tert-butyl hydroperoxide (TBH) for 60 mins. Those cells which we pretreated with vitamin E formed fewer blebs (22.3% compared to 60.0% in nonvitamin E-treated cells) and maintained cytosolic calcium concentration and the number of membrane protein thiols instead of showing the usual symptoms in cells undergoing oxidative stress. Dithiothreitol (DTT) also commonly reduces bleb formation in hepatocytes affected by TBH. However, our experiments clearly demonstrate that DTT does not prevent the changes in cytosolic calcium and membrane protein thiols in the blebbing cells. Consequently, we decided to pretreat cells with both DTT and vitamin E and found that the influence of TBH was entirely prevented. These findings may provide us with a new aspect for investigating the mechanism of bleb formation under oxidative stress.
Tsai
Jen-Hsiang
JH
Department of Physical Therapy, School of Medical and Health Sciences, Fooyin University, Kaohsiung 83102, Taiwan.
Chen
Haw-Wen
HW
Chen
Yi-Wan
YW
Liu
Jer-Yuh
JY
Lii
Chong-Kuei
CK
D000704:Analysis of Variance; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D048430:Cell Shape / Q000187:drug effects; D002478:Cells, Cultured; D004229:Dithiothreitol / Q000494:pharmacology*; D005978:Glutathione / Q000378:metabolism; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism; D042541:Intracellular Space / Q000187:drug effects; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D015227:Lipid Peroxidation; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism; D018613:Microscopy, Confocal; D018384:Oxidative Stress / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013438:Sulfhydryl Compounds / Q000378:metabolism; D014810:Vitamin E / Q000494:pharmacology*; D020122:tert-Butylhydroperoxide
D008565:Membrane Proteins; D013438:Sulfhydryl Compounds; D014810:Vitamin E; D020122:tert-Butylhydroperoxide; D007770:L-Lactate Dehydrogenase; D005978:Glutathione; D002118:Calcium; D004229:Dithiothreitol