Ethanol-induced augmentation of annexin IV in cultured cells and the enhancement of cytotoxicity by overexpression of annexin IV by ethanol.
The annexins are a family of highly homologous Ca(2+) and phospholipid binding proteins. The expressive amounts of several annexins have been shown to alter in certain pathological states such as brain ischemia and Alzheimer's disease. It has been demonstrated that ethanol induces cytotoxicity, which results in brain damage. In this study, we examined the relationship between ethanol-induced cytotoxicity and the intrinsic amount of annexins using cell lines (rat glioma C6 cells and human adenocarcinoma A549 cells). A decrease in the mitochondrial enzyme (dehydrogenase) activity, which is widely used to measure cytotoxicity, was observed with a high concentration of ethanol (200 mM or more) after a 24-h exposure in both C6 and A549 cells. Western blot analysis revealed that the amount of annexin IV was augmented in both cells by ethanol, whereas levels of annexins I and V were unchanged. The amount of annexin IV was augmented with increasing concentration of ethanol. The overexpression of annexin IV in C6 cells by transfection with annexin IV-DNA enhanced ethanol-induced cell lesion and was accompanied by NFkappaB activation. Thus, it might be indicated that the amount of annexin IV is selectively augmented and this augmentation facilitates the development of cell lesion by ethanol.
Ohkawa
Hiroko
H
Department of Biochemistry, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Japan. sohma@sapmed.ac.jp
Sohma
Hitoshi
H
Sakai
Rie
R
Kuroki
Yoshio
Y
Hashimoto
Eri
E
Murakami
Shinji
S
Saito
Toshikazu
T
D000818:Animals; D017305:Annexin A1 / Q000378:metabolism; D017314:Annexin A4 / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D017304:Annexin A5 / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D024202:Electrophoretic Mobility Shift Assay; D000431:Ethanol / Q000494:pharmacology* / Q000633:toxicity; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D016328:NF-kappa B / Q000378:metabolism; D051381:Rats; D014162:Transfection; D014407:Tumor Cells, Cultured
D017305:Annexin A1; D017314:Annexin A4; D017304:Annexin A5; D016328:NF-kappa B; D000431:Ethanol