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The present study describes the activity of Ca(2+)-ATPase in liver plasma membrane and cytosolic-free Ca2+ concentration ([Ca2+]i) in an individual vital cell in mouse liver 18 h after endotoxin administration. Ca(2+)-ATPase activity in liver plasma membrane in the poisoned mice was markedly decreased to 28% of that in the control. The membrane protein damage in liver was found mostly in the molecular weight (M.W.) regions near 60,000-150,000 in endotoxemic mice, and was markedly injured near 140,000 (M. W. of Ca(2+)-ATPase in liver plasma membrane). The level of [Ca2+]i in liver cells in endotoxin-poisoned mice was greater at 18 h postintoxication than that of the control. These findings suggest the possibility that the depression of Ca(2+)-ATPase activity in liver plasma membrane in mice may contribute to membrane damage caused by the endotoxin, and that the increase of [Ca2+]i in liver cytoplasm may partially explain various endotoxin-induced metabolic disorders.

Decline in Plasma Membrane Ca2+-ATPase Activity and Increase in Cytosolic-Free Ca2+ Concentration of Endotoxin-Injected Mice Livers.