Anner BM. Transposing results from an artificial minicell to a real cell. Experimental evidence for a working hypothesis linking Na,K-ATPase permeability states to specific alterations of cell life.
Ann N Y Acad Sci 1997;
834:367-71. [PMID:
9405826 DOI:
10.1111/j.1749-6632.1997.tb52273.x]
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Abstract
The present work sets in parallel data obtained with the Na,K-ATPase in artificial vesicular membranes (artificial minicells) and in peripheral human lymphocytes ex vivo. The Na,K-ATPase was purified and reconstituted into single-walled, tight liposomes filled with a reservoir of ATP and Na in which the Na,K-ATPase functions as in cells, that is, the receptor is accessible on the liposome surface (artificial minicells). In this system, an E2-ouabain state impermeable to Rb ions and an Na,K-ATPase-palytoxin state leaky for Rb ions were characterized. The tight E2-ouabain form preserves the viability of isolated lymphocytes, whereas the leaky Na,K-ATPase-palytoxin induces rapid cell bursting and death by a ouabain-sensitive mechanism. Thus, the effect of Na,K-ATPase inhibitors on lymphocyte survival can be predicted from permeability measurements in artificial minicells as verified also with the leak-inducing metals mercury and silver.
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