DIFFERENT OXIDANT SENSITIVITIES OF THE ALPHA(1) AND ALPHA(2) ISOFORMS OF NA+/K+-ATPASE EXPRESSED IN BACULOVIRUS-INFECTED INSECT CELLS

被引：41

作者：

XIE, Z ^{[1
]}

JACKHAYS, M ^{[1
]}

WANG, Y ^{[1
]}

PERIYASAMY, SM ^{[1
]}

BLANCO, G ^{[1
]}

HUANG, WH ^{[1
]}

ASKARI, A ^{[1
]}

机构：

[1] WASHINGTON UNIV,SCH MED,DEPT CELL BIOL & PHYSIOL,ST LOUIS,MO 63110

来源：

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS | 1995年 / 207卷 / 01期

关键词：

D O I：

10.1006/bbrc.1995.1166

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Inhibition of Na+/K+-ATPase by partially reduced oxygen metabolites is an early event in the course of cell injury caused by oxidative stress. We showed before that isoforms of the enzyme obtained from different sources have different oxidant sensitivities. To evaluate the role of tissue-specific impurities in this difference, cDNAs of alpha(1) and alpha(2) isoforms were expressed in Sf-9 insect cells, and the effects of H2O2 on the resulting isolated enzymes were studied. The expressed alpha(2) was significantly more sensitive than alpha(1) to H2O2. These findings, together with our previous data showing different oxidant sensitivities of alpha(1) and alpha(3) in a cardiac enzyme preparation, indicate that differential oxidant sensitivities of Na+/K+-ATPase isoforms of various tissues are dictated by the primary sequences of alpha(1), alpha(2), and alpha(3) subunits. (C) 1995 Academic Press, Inc.

引用

页码：155 / 159

页数：5

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