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• W2078400045 abstract "Experiments were performed to probe the mechanism by which Bacillus anthracis Lethal Toxin (LeTx) causes lysis of J774 macrophage-like cells. After incubation of cells with saturating concentrations of the toxin, two categories of effects were found, which were distinguishable on the basis of chronology, Ca(2+)-dependence, and sensitivity to osmolarity. The earliest events (category I), beginning 45 min postchallenge, were an increase in permeability to 22Na and 86Rb and a rapid conversion of ATP to ADP and AMP. Later events (category II) included alterations in membrane permeability to 45Ca, 51Cr, 36Cl, 35SO4, 3H-amino acids, and 3H-uridine, beginning at 60 min; inhibition of macromolecular synthesis, leakage of cellular lactate dehydrogenase and onset of gross morphological changes, at approximately 75 min; and cell lysis, beginning at 90 min. Category II events exhibited an absolute requirement for extracellular Ca2+ and were blocked by addition of 0.3 M sucrose to the medium, whereas category I events were attenuated, but not blocked, by either of these conditions. On the other hand, both ATP depletion and the category II events were blocked in osmotically stabilized medium that was also isoionic for Na+ and K+. This suggests that permeabilization of the plasma membrane to monovalent cations and water may be the earliest of the physiological changes described here. The resulting influx of Na+ and efflux of K+ would be expected to cause depletion of ATP, via increased activity of the Na+/K+ pump. Subsequently the influx of Ca2+, induced by depletion of ATP, imbalances in monovalent cautions, and/or more dramatic changes in permeability due to influx of water, would be expected to trigger widespread changes leading ultimately to cytolysis." @default.
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• W2078400045 date "1992-11-01" @default.
• W2078400045 modified "2023-09-23" @default.
• W2078400045 title "Biochemical and physiological changes induced by anthrax lethal toxin in J774 macrophage-like cells." @default.
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• W2078400045 doi "https://doi.org/10.1091/mbc.3.11.1269" @default.
• W2078400045 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/275693" @default.
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